[ { "ch": "An oxygen molecule is made up of:", "ansGr": [ { "ans": [ "Two oxygen atoms sharing electrons", "true" ] }, { "ans": [ "Two oxygen atoms sharing neutrons", "false" ] }, { "ans": [ "Two oxygen atoms sharing protons", "false" ] } ] }, { "ch": "What is a conductor?", "ansGr": [ { "ans": [ "The atoms in this material has a few loosely bound electrons in their outer orbits", "true" ] }, { "ans": [ "Under normal conditions, atoms in this material do not produce free electrons", "false" ] }, { "ans": [ "This material is the process by which an atom loses or gains electrons", "false" ] } ] }, { "ch": "An atom is:", "ansGr": [ { "ans": [ "The smallest part of an element that retains its characteristics", "true" ] }, { "ans": [ "The smallest part of a compound that can exist independently", "false" ] }, { "ans": [ "The smallest particle of matter", "false" ] } ] }, { "ch": "If electrons are added to an atom it becomes:", "ansGr": [ { "ans": [ "A negative ion", "true" ] }, { "ans": [ "A positive ion", "false" ] }, { "ans": [ "A neutral ion", "false" ] } ] }, { "ch": "The charge on a proton is:", "ansGr": [ { "ans": [ "Positive", "true" ] }, { "ans": [ "Neutral", "false" ] }, { "ans": [ "Negative", "false" ] } ] }, { "ch": "What is an element in basic chemistry?", "ansGr": [ { "ans": [ "A material that cannot be reduced to a simpler form by chemical means", "true" ] }, { "ans": [ "A substance that can be split into simpler substances", "false" ] }, { "ans": [ "A mixture of two or more compounds", "false" ] } ] }, { "ch": "What is static electricity?", "ansGr": [ { "ans": [ "Static electricity is a build up of an electrical charge on the surface of an object", "true" ] }, { "ans": [ "Static electricity is a build up of an electrical charge inside of an object", "false" ] }, { "ans": [ "Static electricity is a build up of an electrical charge on the surface and inside of an object.", "false" ] } ] }, { "ch": "What happen when touching each ball with these differently charged sources?", "ansGr": [ { "ans": [ "They attract each other", "true" ] }, { "ans": [ "They repel each other", "false" ] }, { "ans": [ "They dont have any interact.", "false" ] } ] }, { "ch": "All electrons have:", "ansGr": [ { "ans": [ "Negative charge", "true" ] }, { "ans": [ "Positive charge", "false" ] }, { "ans": [ "Neither positive charge nor negative charge", "false" ] } ] }, { "ch": "What is unit of eletrical charge?", "ansGr": [ { "ans": [ "The coulomb (C)", "true" ] }, { "ans": [ "The ampere (A).", "false" ] }, { "ans": [ "The voltage (V).", "false" ] } ] }, { "ch": "How does the distribution of the charge on an irregularly shaped object?", "ansGr": [ { "ans": [ "The greatest charge is at the points, or areas of sharpest curvature, of the objects.", "true" ] }, { "ans": [ "The charge spread over the entire surface.", "false" ] }, { "ans": [ "The greatest charge is at the points, or areas of largest curvature, of the objects.", "false" ] } ] }, { "ch": "Electrons and protons are:", "ansGr": [ { "ans": [ "Opposite in their charge", "true" ] }, { "ans": [ "The same charge", "false" ] }, { "ans": [ "The same charge and attract each other.", "false" ] } ] }, { "ch": "How to avoid ESD damage when replace a circuit card?", "ansGr": [ { "ans": [ "Touching the chassis of the removed box or wearing a grounding wrist strap.", "true" ] }, { "ans": [ "Stand on a blanket and wearing a grounding wrist strap", "false" ] }, { "ans": [ "Wearing a rubber glove and then touching the chassis of the removed box.", "false" ] } ] }, { "ch": "What is precaution before replacing a component?", "ansGr": [ { "ans": [ "Power must be removed from a circuit before replacing a component", "true" ] }, { "ans": [ "Always connect component to ground point while replacing a component.", "false" ] }, { "ans": [ "Ensure voltages do not exceed maximum allowable voltage of component.", "false" ] } ] }, { "ch": "Electricity can not be conducted through:", "ansGr": [ { "ans": [ "Distilled water", "true" ] }, { "ans": [ "Metallic liquids", "false" ] }, { "ans": [ "Gas", "false" ] } ] }, { "ch": "What happen when electron transfer from an object to another?", "ansGr": [ { "ans": [ "Results in an imbalance of charges between the two objects", "true" ] }, { "ans": [ "Both objects become non-conductive materials.", "false" ] }, { "ans": [ "Both objects are changed number of protons", "false" ] } ] }, { "ch": "The repulsion or attraction between the charges is depend on?", "ansGr": [ { "ans": [ "Distance between charges.", "true" ] }, { "ans": [ "Mass of a charged object.", "false" ] }, { "ans": [ "Volum of a charged object", "false" ] } ] }, { "ch": "What happen If a positively charged rod touches an uncharged metal bar?", "ansGr": [ { "ans": [ "The positively charged rod will draw electrons from the uncharged bar to the point of contact.", "true" ] }, { "ans": [ "The electrons from the positively charged rod will move to the uncharged metal bar.", "false" ] }, { "ans": [ "The uncharged bar will draw electrons from the positively charged rod to the point of contact", "false" ] } ] }, { "ch": "Directions of the electrostatic field from the charged body are:", "ansGr": [ { "ans": [ "In all directions from the charged body", "true" ] }, { "ans": [ "In front of the charged body", "false" ] }, { "ans": [ "Behide of the charged body.", "false" ] } ] }, { "ch": "What is an electric current?", "ansGr": [ { "ans": [ "Electric current is the movement of valence electrons.", "true" ] }, { "ans": [ "Electric current is electrons be injected into a vacuum.", "false" ] }, { "ans": [ "Electric current is the movement of protons.", "false" ] } ] }, { "ch": "Why are metals excellent conductors?", "ansGr": [ { "ans": [ "They have valence electrons with weak covalent bonds.", "true" ] }, { "ans": [ "They have valence electrons with strong covalent bonds.", "false" ] }, { "ans": [ "They easy ionize", "false" ] } ] }, { "ch": "When plastic and glass are rubbed together", "ansGr": [ { "ans": [ "Results in an imbalance of charges between the two materials", "true" ] }, { "ans": [ "They exchange protons to each other", "false" ] }, { "ans": [ "They will combine chemically to form a new substance", "false" ] } ] }, { "ch": "Where are the greatest charge points on the airplane?", "ansGr": [ { "ans": [ "Wing tips", "true" ] }, { "ans": [ "Slat", "false" ] }, { "ans": [ "Tailcone", "false" ] } ] }, { "ch": "Why do some non-metallic liquids conduct electricity?", "ansGr": [ { "ans": [ "Because they contain ions — charged particles that can move freely within the liquid", "true" ] }, { "ans": [ "Because they contain free electrons like metals do", "false" ] }, { "ans": [ "Because non-metallic liquids generate electricity on their own", "false" ] } ] }, { "ch": "An ampere represents the flow of:", "ansGr": [ { "ans": [ "6.241 × 101⁸ electrons", "true" ] }, { "ans": [ "6.241 × 101⁸ netrons", "false" ] }, { "ans": [ "6.241 × 101⁸ protons", "false" ] } ] }, { "ch": "How is kilovolt expressed to volt?", "ansGr": [ { "ans": [ "1000V", "true" ] }, { "ans": [ "100V", "false" ] }, { "ans": [ "10V", "false" ] } ] }, { "ch": "Current flowed out of a positive source into a negative source is called:", "ansGr": [ { "ans": [ "Conventional current flow", "true" ] }, { "ans": [ "Electron flow", "false" ] }, { "ans": [ "Negtive flow", "false" ] } ] }, { "ch": "The force that causes the difference in electrical energy between the two points. This force is called:", "ansGr": [ { "ans": [ "Electromotive force", "true" ] }, { "ans": [ "Non electromotive force", "false" ] }, { "ans": [ "Potential resistance", "false" ] } ] }, { "ch": "Electromotive force is measured in:", "ansGr": [ { "ans": [ "Volts", "true" ] }, { "ans": [ "Ohms", "false" ] }, { "ans": [ "Watts", "false" ] } ] }, { "ch": "The system international (si) unit for current is?", "ansGr": [ { "ans": [ "Ampere", "true" ] }, { "ans": [ "Volt", "false" ] }, { "ans": [ "Coulomb", "false" ] } ] }, { "ch": "What terminal of battery is the sourse of electrons?", "ansGr": [ { "ans": [ "Negative terminal", "true" ] }, { "ans": [ "Positve terminal", "false" ] }, { "ans": [ "Neithe positive terminal nor negative terminal", "false" ] } ] }, { "ch": "What is the SI unit of resistance?", "ansGr": [ { "ans": [ "Ohm", "true" ] }, { "ans": [ "Sieman", "false" ] }, { "ans": [ "Ohm-metre", "false" ] } ] }, { "ch": "A volt can be considered to be:", "ansGr": [ { "ans": [ "Unit of electrical pressure", "true" ] }, { "ans": [ "Quantity of electrical energy", "false" ] }, { "ans": [ "Unit of electrical power", "false" ] } ] }, { "ch": "What is correct statement?", "ansGr": [ { "ans": [ "Current is a measurement of a rate at which a charge flows through some region of space or a conductor", "true" ] }, { "ans": [ "Current is a force that causes movement of electrons between the two points", "false" ] }, { "ans": [ "When current flow is one direction, it is called alternate current (AC).", "false" ] } ] }, { "ch": "1 ampere (A) of current is equivalent to:", "ansGr": [ { "ans": [ "1 coulomb (C) of charge passing through a conductor in 1 second(s)", "true" ] }, { "ans": [ "1 volt (V) of electromotive force passing through a conductor in 1 second(s).", "false" ] }, { "ans": [ "1 joule (J) of electromotive force passing through a conductor in 1 second(s).", "false" ] } ] }, { "ch": "What happen if the resistance of the conductor is reduced?", "ansGr": [ { "ans": [ "The current that flows under the given voltage will increase", "true" ] }, { "ans": [ "The current that flows under the given voltage will decrease", "false" ] }, { "ans": [ "The current that flows under the given voltage not change", "false" ] } ] }, { "ch": "What happen if the resistance of the conductor is reduced?", "ansGr": [ { "ans": [ "The current that flows under the given voltage will increase", "true" ] }, { "ans": [ "The current that flows under the given voltage will decrease", "false" ] }, { "ans": [ "The current that flows under the given voltage not change", "false" ] } ] }, { "ch": "When a voltage is applied across the conductor:", "ansGr": [ { "ans": [ "An electromotive force creates an electric field within the conductor and the current is established", "true" ] }, { "ans": [ "An electromotive force creates an electric field within the conductor and the conductor is charged with negative charge", "false" ] }, { "ans": [ "The current is established and the conductor is charged with positive charge.", "false" ] } ] }, { "ch": "What is relationship between the potential difference, the electromotive force and charge?", "ansGr": [ { "ans": [ "The potential difference is directly proportional to the electromotive force and inversely proportional to charge", "true" ] }, { "ans": [ "The potential difference is directly proportional to charge and inversely proportional to the electromotive force", "false" ] }, { "ans": [ "The potential difference is directly proportional to the electromotive force and charge", "false" ] } ] }, { "ch": "What is relationship between the Current, the Charge and Time?", "ansGr": [ { "ans": [ "Current is directly proportional to Charge and inversely proportional to Time", "true" ] }, { "ans": [ "Current is directly proportional to Time and inversely proportional to Charge", "false" ] }, { "ans": [ "Current is directly proportional to Time and Charge", "false" ] } ] }, { "ch": "What is correct statement for the current?", "ansGr": [ { "ans": [ "Current is a measurement of a rate at which a charge flows through some region of space or a conductor", "true" ] }, { "ans": [ "Current has no relation to resistance in a circuit", "false" ] }, { "ans": [ "Current is inversely related voltage", "false" ] } ] }, { "ch": "What are methods to produce electrical energy?", "ansGr": [ { "ans": [ "Pressure, Chemical, Thermal and light", "true" ] }, { "ans": [ "Thermal and Chemical methods only", "false" ] }, { "ans": [ "Chemical, Thermal and light methods only.", "false" ] } ] }, { "ch": "The method to produce electrical energy by application of mechanical pressure on a dielectric or nonconducting crystal is:", "ansGr": [ { "ans": [ "Pressure method", "true" ] }, { "ans": [ "Thermal method", "false" ] }, { "ans": [ "Light method", "false" ] } ] }, { "ch": "What is the piezoelectric effect?", "ansGr": [ { "ans": [ "When apply a voltage between certain faces of the crystal (piezoelectric materials) can produce a mechanical distortion", "true" ] }, { "ans": [ "When apply a force between certain faces of the crystal (piezoelectric materials) can produce a mechanical distortion", "false" ] }, { "ans": [ "When apply a force on upper faces of the crystal (piezoelectric materials) can produce a mechanical distortion", "false" ] } ] }, { "ch": "What is method that produces electricity using two different metals in a chemical solution?", "ansGr": [ { "ans": [ "Chemical action method", "true" ] }, { "ans": [ "Mechanical method", "false" ] }, { "ans": [ "Friction method", "false" ] } ] }, { "ch": "What is a thermocouple?", "ansGr": [ { "ans": [ "Pairs of dissimilar metal wires joined at least at one end", "true" ] }, { "ans": [ "Pairs of similar metal wires joined at least at one end", "false" ] }, { "ans": [ "Pairs of dissimilar metal wires joined at end of both by other metal wires.", "false" ] } ] }, { "ch": "The device contains certain chemical elements that when exposed to light energy, they will:", "ansGr": [ { "ans": [ "Release electrons", "true" ] }, { "ans": [ "Collect electrons", "false" ] }, { "ans": [ "Release neutrons", "false" ] } ] }, { "ch": "What is the primary function of a solar (photovoltaic) cell?", "ansGr": [ { "ans": [ "To convert light energy into electricity", "true" ] }, { "ans": [ "To reflect photons back into the atmosphere", "false" ] }, { "ans": [ "To convert heat into electromotive force", "false" ] } ] }, { "ch": "What type of electricity is produced when non-conductive materials are rubbed together?", "ansGr": [ { "ans": [ "Static electricity", "true" ] }, { "ans": [ "Alternating current", "false" ] }, { "ans": [ "Induced current", "false" ] } ] }, { "ch": "What happens when a conductor moves through magnetic lines of flux?", "ansGr": [ { "ans": [ "Electromotive force is created and current flows", "true" ] }, { "ans": [ "Heat is generated", "false" ] }, { "ans": [ "The magnetic field becomes stronger", "false" ] } ] }, { "ch": "The dry cell is the most common type of:", "ansGr": [ { "ans": [ "Primary cell battery", "true" ] }, { "ans": [ "Secondary cell battery", "false" ] }, { "ans": [ "Thermocouple", "false" ] } ] }, { "ch": "What is electrolytic cell of the the lead-acid battery?", "ansGr": [ { "ans": [ "Secondary cell battery secondary cell battery", "true" ] }, { "ans": [ "Primary cell battery", "false" ] }, { "ans": [ "Neither primary cell battery nor", "false" ] } ] }, { "ch": "The lead-acid batteries have:", "ansGr": [ { "ans": [ "More negative plates than positive plates", "true" ] }, { "ans": [ "More positive plates than negative plates", "false" ] }, { "ans": [ "Negative the same positive", "false" ] } ] }, { "ch": "How many voltage of lead acid cell?", "ansGr": [ { "ans": [ "Approximately 2 volts", "true" ] }, { "ans": [ "Approximately 2.5 volts", "false" ] }, { "ans": [ "Approximately 3 volts", "false" ] } ] }, { "ch": "What is the voltage of the external charging source?", "ansGr": [ { "ans": [ "Must be greater than the open circuit voltage of battery", "true" ] }, { "ans": [ "Must be less than the open circuit voltage of battery", "false" ] }, { "ans": [ "Must be less than or the same the open circuit voltage of battery", "false" ] } ] }, { "ch": "What is current for charge battery?", "ansGr": [ { "ans": [ "DC", "true" ] }, { "ans": [ "AC", "false" ] }, { "ans": [ "AC or DC", "false" ] } ] }, { "ch": "How many lead acid cells are there in a battery rated at 12 volts?", "ansGr": [ { "ans": [ "6", "true" ] }, { "ans": [ "3", "false" ] }, { "ans": [ "12", "false" ] } ] }, { "ch": "What is battery life cycle?", "ansGr": [ { "ans": [ "The number of complete charge/discharges cycles a battery can perform", "true" ] }, { "ans": [ "Percent of capacity battery can be charged", "false" ] }, { "ans": [ "Percent of voltge battery can be charged", "false" ] } ] }, { "ch": "Nickel hydrate (Nio OH) in the charged positive plate (Anode) and sponge Cadmium (Cd) in the charged negative plate (Cathode) are materials of:", "ansGr": [ { "ans": [ "Nickel-cadmium cells", "true" ] }, { "ans": [ "Lead - Acid battery", "false" ] }, { "ans": [ "Lead-Helium cells", "false" ] } ] }, { "ch": "The typical open circuit cell voltage of a nickel-cadmium battery is about:", "ansGr": [ { "ans": [ "1.25V", "true" ] }, { "ans": [ "1V", "false" ] }, { "ans": [ "1.5V", "false" ] } ] }, { "ch": "Nickel-cadmium battery is:", "ansGr": [ { "ans": [ "Rechargeable", "true" ] }, { "ans": [ "Unrechargeable", "false" ] }, { "ans": [ "Rechargeable one time only", "false" ] } ] }, { "ch": "What is requirement for sealed lead acid?", "ansGr": [ { "ans": [ "Not require scheduled deep cycle maintenance", "true" ] }, { "ans": [ "Require scheduled deep cycle maintenance", "false" ] }, { "ans": [ "Check temorature after recharge", "false" ] } ] }, { "ch": "The charging process of primary cell battery is:", "ansGr": [ { "ans": [ "Not reversible", "true" ] }, { "ans": [ "Reversible", "false" ] }, { "ans": [ "Reversible if discherged less than fifty percent", "false" ] } ] }, { "ch": "How are identical cells (positive and negative plates) in the Lead-acid batteries connected?", "ansGr": [ { "ans": [ "In series", "true" ] }, { "ans": [ "In parallel", "false" ] }, { "ans": [ "Negative plates are connected in series, positve plates are connected in parallel", "false" ] } ] }, { "ch": "What does a battery with a capacity of 1 amp-hour mean?", "ansGr": [ { "ans": [ "A battery should be able to continuously supply a current of 1 amp to a load for exactly 1 hour", "true" ] }, { "ans": [ "A battery need a current of 1 amp to full charge for exactly 1 hour", "false" ] }, { "ans": [ "A battery should be able to continuously supply a current of 1 amp to a load for more than 1 hour", "false" ] } ] }, { "ch": "What is method used to charge batteries?", "ansGr": [ { "ans": [ "Either the constant voltage or constant current method", "true" ] }, { "ans": [ "The constant voltage method only", "false" ] }, { "ans": [ "Either the constant voltage or constant current method", "false" ] } ] }, { "ch": "How long a battery with a capacity of 5 amp-hour should be able to continuously supply a current of 2 amp to a load?", "ansGr": [ { "ans": [ "2.5", "true" ] }, { "ans": [ "2", "false" ] }, { "ans": [ "5", "false" ] } ] }, { "ch": "Lead - Acid battery testing method using hydrometer is to check:", "ansGr": [ { "ans": [ "The density of the electrolyte", "true" ] }, { "ans": [ "The volume of the electrolyte", "false" ] }, { "ans": [ "The mass of the electrolyte", "false" ] } ] }, { "ch": "During nickel-cadmium battery discharge:", "ansGr": [ { "ans": [ "The positive plates slowly give up oxygen", "true" ] }, { "ans": [ "The pnegative plates slowly give up oxygen", "false" ] }, { "ans": [ "The positive plates slowly regained oxygen", "false" ] } ] }, { "ch": "What is function of the nickel-cadmium battery cell relief valves?", "ansGr": [ { "ans": [ "To vent gases inside bateery to the atmosphere", "true" ] }, { "ans": [ "To drain liquid inside bateery to the atmosphere", "false" ] }, { "ans": [ "To drain liquid and vent gas inside bateery to the atmosphere", "false" ] } ] }, { "ch": "What happen when a photon strikes a semiconductor atom?", "ansGr": [ { "ans": [ "It raises the energy level above what is needed to hold its electrons in orbit", "true" ] }, { "ans": [ "Nothing happen", "false" ] }, { "ans": [ "It reduces the energy level what is needed to releave its electrons in orbit", "false" ] } ] }, { "ch": "What is a unit of measurement for battery capacity?", "ansGr": [ { "ans": [ "The amp - hour rating", "true" ] }, { "ans": [ "The volt - amp rating", "false" ] }, { "ans": [ "The volt - amp - hour rating", "false" ] } ] }, { "ch": "When connecting batteries in parallel", "ansGr": [ { "ans": [ "The amp-hour capacity is increased", "true" ] }, { "ans": [ "The amp-hour capacity is decreased", "false" ] }, { "ans": [ "The total voltage is decreased", "false" ] } ] }, { "ch": "When connecting batteries in series", "ansGr": [ { "ans": [ "The total voltage is increased", "true" ] }, { "ans": [ "The total voltage is decreased", "false" ] }, { "ans": [ "The amp-hour capacity is increased", "false" ] } ] }, { "ch": "What is correct statement for Lead-acid battery?", "ansGr": [ { "ans": [ "The open circuit voltage of a fully charged 12 cell, lead-acid battery is approximately 26.4 volts", "true" ] }, { "ans": [ "Approximately 28 volts are required to charge it", "false" ] }, { "ans": [ "The charging voltage of a lead acid battery must less than the open circuit voltage plus the IR drop within the battery", "false" ] } ] }, { "ch": "How is the internal resistance of a lead-acid battery affected over time?", "ansGr": [ { "ans": [ "Increases over time", "true" ] }, { "ans": [ "Decreases over time", "false" ] }, { "ans": [ "The internal resistance of a lead-acid battery is not affected over time", "false" ] } ] }, { "ch": "What is correct statement for Lead-acid battery charging?", "ansGr": [ { "ans": [ "The constant voltage method requires less time and supervision than does the constant current method", "true" ] }, { "ans": [ "The constant voltage method requires more time and supervision than does the constant current method", "false" ] }, { "ans": [ "In the constant current method, the current increases during the entire charging process", "false" ] } ] }, { "ch": "When does a cell of a nickel-cadmium battery emit gas?", "ansGr": [ { "ans": [ "This will also occur if the cells are overcharged", "true" ] }, { "ans": [ "When a storage battery is being charged", "false" ] }, { "ans": [ "When begine of the charging cycle", "false" ] } ] }, { "ch": "What is correct statement for sealed lead acid (SLA) batteries?, when the SLA battery is installed on the airpane", "ansGr": [ { "ans": [ "It can be designed to alert the technician if a battery is failing", "true" ] }, { "ans": [ "It is necessary to purchase special battery maintenance equipment", "false" ] }, { "ans": [ "It must have a scheduled energy test performed on the bench", "false" ] } ] }, { "ch": "What is purpose of the thermocouple?", "ansGr": [ { "ans": [ "Is used to measure high temperatures", "true" ] }, { "ans": [ "Is used to measure low and medium temperatures", "false" ] }, { "ans": [ "Is used to measure outside air temperature", "false" ] } ] }, { "ch": "The total resistance of the series circuit is:", "ansGr": [ { "ans": [ "Equal to the sum of the individual resistors", "true" ] }, { "ans": [ "Smaller than the smallest resistor", "false" ] }, { "ans": [ "Smaller than the largest resistor", "false" ] } ] }, { "ch": "The voltage in a series circuit of resistors:", "ansGr": [ { "ans": [ "Is different in each resistor", "true" ] }, { "ans": [ "Is the same in each resistor", "false" ] }, { "ans": [ "The voltage drop in the smallest resistor equal to the voltage of sourse", "false" ] } ] }, { "ch": "Two or more of voltage sources are connected in series:", "ansGr": [ { "ans": [ "The total voltage is equal to the sum of the individual voltages", "true" ] }, { "ans": [ "The total voltage equals the difference between the individual voltages", "false" ] }, { "ans": [ "The total voltage is the same as the highest individual", "false" ] } ] }, { "ch": "Which does law state that: the algebraic sum of all voltages around a closed path or loop is zero?", "ansGr": [ { "ans": [ "Kirchhoff's voltage law", "true" ] }, { "ans": [ "Ohm's law", "false" ] }, { "ans": [ "Faraday's Law", "false" ] } ] }, { "ch": "In a parallel circuit containing resistors:", "ansGr": [ { "ans": [ "The voltage is the same in all branch of the circuit", "true" ] }, { "ans": [ "The sum of the voltage drops in each branch equals applied voltage", "false" ] }, { "ans": [ "The current is the same in each branch of the circuit", "false" ] } ] }, { "ch": "The total resistance of the parallel circuit is:", "ansGr": [ { "ans": [ "Obtained by taking the reciprocal of the sum of the reciprocals of the resistances of all the resistors connected in parallel", "true" ] }, { "ans": [ "Equal to the sum of the individual resistors", "false" ] }, { "ans": [ "Larger than the largest resistor", "false" ] } ] }, { "ch": "Total resistor of 2 resistor (R1 = 500 Ω, R2 = 400 Ω) are conneted in parallel is:", "ansGr": [ { "ans": [ "222.22 Ω", "true" ] }, { "ans": [ "450 Ω", "false" ] }, { "ans": [ "500 Ω", "false" ] } ] }, { "ch": "Kirchhoff's current law of parallel circuit stated that:", "ansGr": [ { "ans": [ "The sum of the currents into a junction or node is equal to the sum of the currents flowing out of that same junction or node", "true" ] }, { "ans": [ "The sum of the currents into a junction or node is greater than the sum of the currents flowing out of that same junction or node", "false" ] }, { "ans": [ "The sum of the currents into a junction or node is less than the sum of the currents flowing out of that same junction or node", "false" ] } ] }, { "ch": "Ohm's law states that", "ansGr": [ { "ans": [ "Current= voltage divided by resistance", "true" ] }, { "ans": [ "Resistance= current divided by voltage", "false" ] }, { "ans": [ "Voltage= current divided by resistance", "false" ] } ] }, { "ch": "If two resistors of 5 and 10 ohm respectively are connected in series and the current in the 5 ohm resistor is 1A. What is the current in the 10 ohm resistor?", "ansGr": [ { "ans": [ "1 amp", "true" ] }, { "ans": [ "It cannot be found without knowing the applied voltage", "false" ] }, { "ans": [ "1/3 amp", "false" ] } ] }, { "ch": "A circuit consists of 3 ohm, 5 ohm and 12 ohm resistors in series, the current flowing in the 5 ohm resistor is 10 amps. What is the applied voltage?", "ansGr": [ { "ans": [ "200v", "true" ] }, { "ans": [ "10v", "false" ] }, { "ans": [ "100v", "false" ] } ] }, { "ch": "Total voltage of three 1.5V DC sourses are connected in series with the polarity in the same direction is:", "ansGr": [ { "ans": [ "4.5V", "true" ] }, { "ans": [ "1.5V", "false" ] }, { "ans": [ "3V", "false" ] } ] }, { "ch": "One circuit has 4 resistors (R1 = 10 Ω, R2 = 50 Ω, R3 = 100 Ω, R4 = unkown) are connected in series and DC sourse = 100V. Current flows through R1 is 200mA. Determine the value of E4", "ansGr": [ { "ans": [ "68V", "true" ] }, { "ans": [ "100V", "false" ] }, { "ans": [ "34V", "false" ] } ] }, { "ch": "Five different value resistors all have the same voltage dropped across them, how are the resistors connected?", "ansGr": [ { "ans": [ "In parallel", "true" ] }, { "ans": [ "In series", "false" ] }, { "ans": [ "Both in series and parallel", "false" ] } ] }, { "ch": "Three different value resistors are conneted in parallel. Current flows through R1 is 20mA, R2 is 30mA. Total current, I = 75mA. Determine the value of Current flows through R2?", "ansGr": [ { "ans": [ "25mA", "true" ] }, { "ans": [ "75mA", "false" ] }, { "ans": [ "50mA", "false" ] } ] }, { "ch": "In the circuit shown the 24 volt battery has the ammeter indicates a current of 12 amperes. The value of the load resistance is:", "ansGr": [ { "ans": [ "2 Ω", "true" ] }, { "ans": [ "4 Ω", "false" ] }, { "ans": [ "8 Ω", "false" ] } ] }, { "ch": "There three different value resistors R1, R2, R3. If R1 and R2 are connected in parallel then connect to R3:", "ansGr": [ { "ans": [ "The currents flow through each R1, R2 and R3 are not the same.", "true" ] }, { "ans": [ "The voltage drop in each R1, R2 and R3 are the same.", "false" ] }, { "ans": [ "The currents flow through each R1, R2 and R3 are the same.", "false" ] } ] }, { "ch": "If the voltage across a resistor is doubled:", "ansGr": [ { "ans": [ "The current is doubled.", "true" ] }, { "ans": [ "The current is halved.", "false" ] }, { "ans": [ "The current is not change.", "false" ] } ] }, { "ch": "There is a 12-volt DC source in series with two resistors, R₁ = 10 Ω and R₂ = 30 Ω", "ansGr": [ { "ans": [ "The current pass through R1 and R2 are the same", "true" ] }, { "ans": [ "The current pass through R1 is three times the current pass through R2", "false" ] }, { "ans": [ "The current pass through R2 is three times the current pass through R1", "false" ] } ] }, { "ch": "There is a 12-volt DC source in series with two resistors, R₁ = 1 kΩ and R₂ = 3 kΩ", "ansGr": [ { "ans": [ "The voltage drop at R1 is 1V", "true" ] }, { "ans": [ "The voltage drop at R1 is 9V", "false" ] }, { "ans": [ "The voltage drop at R1 is 12V", "false" ] } ] }, { "ch": "How many voltage of DC source if the current pass through in series with two resistors, R₁ = 1 kΩ and R₂ = 3 kΩ, is 2 mA?", "ansGr": [ { "ans": [ "8V", "true" ] }, { "ans": [ "4V", "false" ] }, { "ans": [ "6V", "false" ] } ] }, { "ch": "What is the total voltage if three cells, each with a value of 1.5 volts, are connected in series, but one of the cells has been reversed?", "ansGr": [ { "ans": [ "1.5V", "true" ] }, { "ans": [ "4.5V", "false" ] }, { "ans": [ "3V", "false" ] } ] }, { "ch": "What is the source voltage, if there are two resistors are connected in series, one has a drop of 14 volts and the other has a drop of 10 volts", "ansGr": [ { "ans": [ "24V", "true" ] }, { "ans": [ "14V", "false" ] }, { "ans": [ "12V", "false" ] } ] }, { "ch": "Determine the voltage drop across R3 in a series circuit with resistors R1, R2 and R3. Given that the voltage drops across R1 and R2 are 12 V and 10 V, respectively, and the voltage source is rated at 50 V", "ansGr": [ { "ans": [ "28V", "true" ] }, { "ans": [ "38V", "false" ] }, { "ans": [ "40V", "false" ] } ] }, { "ch": "There is a 12-volt DC source in rarallel with two resistors, R₁ = 10 Ω and R₂ = 30 Ω", "ansGr": [ { "ans": [ "The current passing through R1 is three times the current passing through R2", "true" ] }, { "ans": [ "The current pass through the R1 and R2 are the same", "false" ] }, { "ans": [ "The current pass through the R2 is three times the current pass through R1", "false" ] } ] }, { "ch": "Determine the source voltage in a circuit including R1= 2 kΩ and R2 = 3 kΩ are connected in parallel and then connect to R3 = 1kΩ. Know, R3 carrying a current of 1 mA", "ansGr": [ { "ans": [ "2.2V", "true" ] }, { "ans": [ "1V", "false" ] }, { "ans": [ "6V", "false" ] } ] }, { "ch": "In a electrical circuit, under the given voltage:", "ansGr": [ { "ans": [ "If the resistance is reduced, then the current will increase", "true" ] }, { "ans": [ "If the resistance is reduced, then the current will decrease", "false" ] }, { "ans": [ "If the resistance is reduced, then the current will not change", "false" ] } ] }, { "ch": "The unit used to measure resistance is:", "ansGr": [ { "ans": [ "Ohm", "true" ] }, { "ans": [ "Ampere", "false" ] }, { "ans": [ "Volt", "false" ] } ] }, { "ch": "The symbol for the ohm is:", "ansGr": [ { "ans": [ "Omega (Ω)", "true" ] }, { "ans": [ "Fara (F)", "false" ] }, { "ans": [ "Coulomb (C)", "false" ] } ] }, { "ch": "Apply a voltage of 1 volt to 1 ohm of resistance, the resistance will limit the current flow is:", "ansGr": [ { "ans": [ "1 ampere", "true" ] }, { "ans": [ "2 ampere", "false" ] }, { "ans": [ "zero", "false" ] } ] }, { "ch": "How does the current flow aross the conductor, if the same size conductor is doubled in length?", "ansGr": [ { "ans": [ "The current flow will be reduced by one-half", "true" ] }, { "ans": [ "The current flow does not change", "false" ] }, { "ans": [ "The current flow will be increased to double", "false" ] } ] }, { "ch": "The resistance of a material is determined by:", "ansGr": [ { "ans": [ "Material, length, area, and temperature", "true" ] }, { "ans": [ "Material, length, area and solid or hollow", "false" ] }, { "ans": [ "Length, area, temperature and solid or hollow", "false" ] } ] }, { "ch": "If a conductor that is 1 meter long with a cross-sectional area of 1 mm2 and has a resistance of 0.017 ohm, what is the resistance of 50m of wire from the same material but with a cross-sectional area of 0.25 mm2?", "ansGr": [ { "ans": [ "3.4 Ω", "true" ] }, { "ans": [ "6.8 Ω", "false" ] }, { "ans": [ "7.5 Ω", "false" ] } ] }, { "ch": "How is difference diameter of condutor A and conductor B if AWG size of condutor A larger than conductor B?", "ansGr": [ { "ans": [ "Diameter of condutor A smaller than conductor B", "true" ] }, { "ans": [ "Diameter of condutor A larger than conductor B", "false" ] }, { "ans": [ "The same", "false" ] } ] }, { "ch": "What is the \"tolerance\" of a resistor?", "ansGr": [ { "ans": [ "Is the percentage variation between the marked value and the actual value of a resistor", "true" ] }, { "ans": [ "Is the percentage variation between the marked dimention value and the actual value of a resistor", "false" ] }, { "ans": [ "Is the percentage variation between the marked life time value and the actual value of a resistor", "false" ] } ] }, { "ch": "How is the temperature coefficient of resistance for copper and Aluminum?", "ansGr": [ { "ans": [ "The temperature coefficient of resistance for copper smaller than Aluminum", "true" ] }, { "ans": [ "The same", "false" ] }, { "ans": [ "The temperature coefficient of resistance for copper larger than Aluminum", "false" ] } ] }, { "ch": "A Copper wire and an Aluminium wire have the same diameter:", "ansGr": [ { "ans": [ "The resistance of the Copper wire is smaller than the Aluminium wire", "true" ] }, { "ans": [ "The resistance of the Copper wire is larger than the Aluminium wire", "false" ] }, { "ans": [ "The resistance of the Copper wire and the Aluminium wire are the same", "false" ] } ] }, { "ch": "In a circuit containing three resistors of equal value connected in parallel, one resistor goes open circuit. The current in the other two: resistors will", "ansGr": [ { "ans": [ "Increase", "true" ] }, { "ans": [ "Decrease", "false" ] }, { "ans": [ "Remain the same", "false" ] } ] }, { "ch": "The resistance of a metallic conductor is:", "ansGr": [ { "ans": [ "Inversely proportional to the cross-sectional area", "true" ] }, { "ans": [ "Proportional to the cross-sectional area", "false" ] }, { "ans": [ "Not depend on to the cross-sectional area", "false" ] } ] }, { "ch": "If the voltage across a resistor is increased three times", "ansGr": [ { "ans": [ "The current through this resistor is also increased three times", "true" ] }, { "ans": [ "The current through this resistor doubles", "false" ] }, { "ans": [ "The current through this resistor does not change", "false" ] } ] }, { "ch": "What is correct statement for the insulator?", "ansGr": [ { "ans": [ "Insulator is material that offer high resistance", "true" ] }, { "ans": [ "Insulator is material that offer low resistance", "false" ] }, { "ans": [ "Insulator is material which possess a large number of free electrons", "false" ] } ] }, { "ch": "How does the resistance of a solid metallic conductor compare to a hollow metallic conductor with the same material and shape", "ansGr": [ { "ans": [ "The solid metallic conductor has resistance as well as hollow metallic conductor", "true" ] }, { "ans": [ "The solid metallic conductor has resistance greater the hollow metallic conductor", "false" ] }, { "ans": [ "The solid metallic conductor has resistance smaller the hollow metallic conductor", "false" ] } ] }, { "ch": "For the circular conductors, the conversion factors 1 mil as", "ansGr": [ { "ans": [ "0.0254 mm", "true" ] }, { "ans": [ "0.3048 meter", "false" ] }, { "ans": [ "0.0001 mm", "false" ] } ] }, { "ch": "When the Wire Gauge numbers (AWG numer) of a circular conductor increases", "ansGr": [ { "ans": [ "The cross-sectional dimension of the circular conductor decreases", "true" ] }, { "ans": [ "The cross-sectional dimension of the circular conductor increases", "false" ] }, { "ans": [ "Theresistence of the circular conductor decreases", "false" ] } ] }, { "ch": "What is a rheostat?", "ansGr": [ { "ans": [ "Is a variable resistor used to vary the amount of current flowing in a circuit", "true" ] }, { "ans": [ "Is used to vary the voltage in a circuit", "false" ] }, { "ans": [ "used to measure capacitance, inductance and impedance", "false" ] } ] }, { "ch": "Whats is perpose of colour bands on the body of resitor?", "ansGr": [ { "ans": [ "To determine the resistance value", "true" ] }, { "ans": [ "To determine the maximum voltage value", "false" ] }, { "ans": [ "To determine the maximum current value", "false" ] } ] }, { "ch": "Maximum number of colour band that is marked on the resistor is:", "ansGr": [ { "ans": [ "6", "true" ] }, { "ans": [ "4", "false" ] }, { "ans": [ "9", "false" ] } ] }, { "ch": "The colour of the first colour band (nearest the end of the resistor) that is marked on the resistor is:", "ansGr": [ { "ans": [ "Never be gold or silver", "true" ] }, { "ans": [ "Silver", "false" ] }, { "ans": [ "Gold", "false" ] } ] }, { "ch": "What is principle of the thermistor?", "ansGr": [ { "ans": [ "Negative temperature coefficient", "true" ] }, { "ans": [ "Positive temperature coefficient", "false" ] }, { "ans": [ "Temperature increases, the resistance of the thermistor increases", "false" ] } ] }, { "ch": "A Wheatstone Bridge with known resistor values R₁, R₂, R₃ (the one end of R1 connect to one end of R3 and connected to source) and a voltmeter (Vg). A fourth resistor (Rx) can calculate as follow:", "ansGr": [ { "ans": [ "Rx = R₁ / R₂ * R₃", "true" ] }, { "ans": [ "Rx = R₂ / R₁ * R₃", "false" ] }, { "ans": [ "Rx = R₁ * R₂ / R₃", "false" ] } ] }, { "ch": "What controls the resistance of a photoconductive cell?", "ansGr": [ { "ans": [ "Light intensity", "true" ] }, { "ans": [ "Ambient temperature", "false" ] }, { "ans": [ "Ambient humidity", "false" ] } ] }, { "ch": "What does Ohm’s Law describe?", "ansGr": [ { "ans": [ "Describe relationship between voltage, current, and resistance", "true" ] }, { "ans": [ "Describe relationship between voltage, current, and power", "false" ] }, { "ans": [ "Describe relationship between current, and resistance and power", "false" ] } ] }, { "ch": "What happens to the resistance of a metallic wire if its length is doubled?", "ansGr": [ { "ans": [ "The resistance doubles", "true" ] }, { "ans": [ "The resistance stays the same", "false" ] }, { "ans": [ "The resistance is reduced by half", "false" ] } ] }, { "ch": "What is the source voltage if two resistors are connected in parallel, with one resistor of 1 kΩ carrying a current of 1 mA and the other carrying a current of 3 mA?", "ansGr": [ { "ans": [ "3V", "true" ] }, { "ans": [ "4V", "false" ] }, { "ans": [ "0.75V", "false" ] } ] }, { "ch": "What is the unit measurement for power?", "ansGr": [ { "ans": [ "Watt (W)", "true" ] }, { "ans": [ "Joules (J)", "false" ] }, { "ans": [ "Coulombs (C)", "false" ] } ] }, { "ch": "If a circuit has a known voltage of 24 volts and a current of 2 amps, then the power in the circuit will be:", "ansGr": [ { "ans": [ "48 W", "true" ] }, { "ans": [ "24 W", "false" ] }, { "ans": [ "96 W", "false" ] } ] }, { "ch": "The total power dissipated in both a series and parallel circuit is equal to:", "ansGr": [ { "ans": [ "The sum of the power dissipated in each resistor in the circuit", "true" ] }, { "ans": [ "The largest power in the circuit", "false" ] }, { "ans": [ "The smallest power in the circuit", "false" ] } ] }, { "ch": "A 48-volt source is required to furnish 192 watts to a parallel circuit consisting of three resistors of equal value. What is the value of each resistor?", "ansGr": [ { "ans": [ "36 ohm", "true" ] }, { "ans": [ "4 ohm", "false" ] }, { "ans": [ "12 ohm", "false" ] } ] }, { "ch": "If a circuit has a known current of 2 amps and a resistance of 100 Ω, then the power in the circuit will be:", "ansGr": [ { "ans": [ "400 W", "true" ] }, { "ans": [ "200 W", "false" ] }, { "ans": [ "50 W", "false" ] } ] }, { "ch": "Suppose 300 J of energy is consumed in 10 seconds, What would be the power in watts?", "ansGr": [ { "ans": [ "30 W", "true" ] }, { "ans": [ "50 W", "false" ] }, { "ans": [ "3000 W", "false" ] } ] }, { "ch": "Supply a voltage of 24 V to two resistors connected in series (each resistor of 6 Ω), the power in the circuit will be", "ansGr": [ { "ans": [ "48W", "true" ] }, { "ans": [ "288 W", "false" ] }, { "ans": [ "2W", "false" ] } ] }, { "ch": "There are two resistors of 100 Ω are connected in parallel, current across through each resistors is 1", "ansGr": [ { "ans": [ "The power in the circuit will be:", "false" ] }, { "ans": [ "200W", "true" ] }, { "ans": [ "100W", "false" ] }, { "ans": [ "50W", "false" ] } ] }, { "ch": "There are two resistors of 100 Ω are connected in series, current across through each resistors is 1", "ansGr": [ { "ans": [ "The power in the circuit will be:", "false" ] }, { "ans": [ "200W", "true" ] }, { "ans": [ "100W", "false" ] }, { "ans": [ "50W", "false" ] } ] }, { "ch": "How is the total power dissipated in both R1 and R2 in a series circuit calculated?", "ansGr": [ { "ans": [ "It is equal to the sum of the power dissipated in each resistor in the circuit", "true" ] }, { "ans": [ "It is equal to half the sum of the power dissipated in each resistor in the circuit.", "false" ] }, { "ans": [ "It is equal to the difference of the power dissipated in each resistor in the circuit", "false" ] } ] }, { "ch": "How is the total power dissipated in both R1 and R2 in a parallel circuit calculated?", "ansGr": [ { "ans": [ "It is equal to the sum of the power dissipated in each resistor in the circuit", "true" ] }, { "ans": [ "It is equal to half the sum of the power dissipated in each resistor in the circuit.", "false" ] }, { "ans": [ "It is equal to the difference of the power dissipated in each resistor in the circuit", "false" ] } ] }, { "ch": "How much energy does a 12-volt battery supply to a 6-ohm resistor over 2 hours?", "ansGr": [ { "ans": [ "48 watt-hours", "true" ] }, { "ans": [ "144 watt-hours", "false" ] }, { "ans": [ "96 watt-hours", "false" ] } ] }, { "ch": "If a circuit has a known voltage of 48 volts and a current of 2 amps, then the power in the circuit will be", "ansGr": [ { "ans": [ "96 W", "true" ] }, { "ans": [ "24 W", "false" ] }, { "ans": [ "192 W", "false" ] } ] }, { "ch": "How is power defined in a DC circuit?", "ansGr": [ { "ans": [ "The amount of energy used or converted over time", "true" ] }, { "ans": [ "The amount of voltage stored over time", "false" ] }, { "ans": [ "The amount of current flowed over time", "false" ] } ] }, { "ch": "What is most basic form of the capacitor constructed?", "ansGr": [ { "ans": [ "Is constructed of two parallel plates separated by a non-conductor", "true" ] }, { "ans": [ "Is constructed of three parallel plates separated by a non-conductor", "false" ] }, { "ans": [ "Is constructed of two parallel plates touched", "false" ] } ] }, { "ch": "What is the basic unit of capacitance?", "ansGr": [ { "ans": [ "Farad (F)", "true" ] }, { "ans": [ "Coulomb (C)", "false" ] }, { "ans": [ "Omh (Ω)", "false" ] } ] }, { "ch": "A capacitor with double the area will have:", "ansGr": [ { "ans": [ "Double the capacitance", "true" ] }, { "ans": [ "Half the capacitance", "false" ] }, { "ans": [ "The same capacitance", "false" ] } ] }, { "ch": "If capacitors are connected in series, what is the total capacitance?", "ansGr": [ { "ans": [ "Is less than the smallest capacitor", "true" ] }, { "ans": [ "Is more than the smallest capacitor", "false" ] }, { "ans": [ "Is equal to the smallest capacitor", "false" ] } ] }, { "ch": "If capacitors are connected in parallel, what is the total capacitance?", "ansGr": [ { "ans": [ "Is the sum of the individual capacitances", "true" ] }, { "ans": [ "Obtained by taking the reciprocal of the sum of the reciprocals of the resistances of all the resistors connected in parallel", "false" ] }, { "ans": [ "Is less than the smallest capacitor", "false" ] } ] }, { "ch": "One Farad is:", "ansGr": [ { "ans": [ "1*10⁻⁶ F", "true" ] }, { "ans": [ "1*10⁶ F", "false" ] }, { "ans": [ "1*10⁻¹² F", "false" ] } ] }, { "ch": "How does the current flow in the circuit during the time the capacitor is being charged or discharged?", "ansGr": [ { "ans": [ "There is no current flow during the time of charge and discharge", "true" ] }, { "ans": [ "There is a current flow in the external circuit", "false" ] }, { "ans": [ "Current is present only during the time of charge", "false" ] } ] }, { "ch": "What does the aircraft technician must be aware when using a capacitor?", "ansGr": [ { "ans": [ "Must be aware of the voltage rating", "true" ] }, { "ans": [ "Must be aware of the thickness of the dielectric", "false" ] }, { "ans": [ "Must be aware of the plate area", "false" ] } ] }, { "ch": "A capacitor with double the area and double the dielectric thickness will have:", "ansGr": [ { "ans": [ "The same capacitance", "true" ] }, { "ans": [ "Half the capacitance", "false" ] }, { "ans": [ "Double the capacitance", "false" ] } ] }, { "ch": "Three 12 microfarad capacitors are connected in parallel. The overall circuit capacitance is:", "ansGr": [ { "ans": [ "36 microfarads.", "true" ] }, { "ans": [ "1 microfarads.", "false" ] }, { "ans": [ "4 microfarads.", "false" ] } ] }, { "ch": "Which is correct statement?", "ansGr": [ { "ans": [ "In a circuit containing only capacitance, the current reaches its maximum value ahead of the voltage and the current leads the voltage by 90°", "true" ] }, { "ans": [ "In a circuit containing only capacitance, the current reaches its maximum value ahead of the voltage and the current leads the voltage by 180°", "false" ] }, { "ans": [ "In a circuit containing only capacitance, the voltage reaches its maximum value ahead of the current and the voltage leads the current by 90°", "false" ] } ] }, { "ch": "What do you do before removing the high voltage capacitor from the circuit?", "ansGr": [ { "ans": [ "Always short the capacitor leads across one another", "true" ] }, { "ans": [ "Do full charge of capacitor", "false" ] }, { "ans": [ "Do 50% charge of capacitor", "false" ] } ] }, { "ch": "How is the total capacitance in a series circuit of three capacitors (C₁ = 10μF, C₂ = 5μF and C₃ = 8μF)?", "ansGr": [ { "ans": [ "Less than 5μF", "true" ] }, { "ans": [ "Greater than 10μF", "false" ] }, { "ans": [ "Equal to 8μF", "false" ] } ] }, { "ch": "What is the phase relationship between current and voltage when an alternating current source is applied to a capacitor?", "ansGr": [ { "ans": [ "Voltage lags Current by 90°", "true" ] }, { "ans": [ "Voltage leads Current by 90°", "false" ] }, { "ans": [ "Voltage and current are in phase", "false" ] } ] }, { "ch": "What is the phase relationship between current and voltage when an alternating current source is applied to a inductance?", "ansGr": [ { "ans": [ "Voltage leads Current by 90°", "true" ] }, { "ans": [ "Voltage lags Current by 90°", "false" ] }, { "ans": [ "Voltage and current are in phase", "false" ] } ] }, { "ch": "What happens when a capacitor is connected to a DC source and the switch is closed?", "ansGr": [ { "ans": [ "A current flows briefly until the capacitor is fully charged", "true" ] }, { "ans": [ "The capacitor continuously allows current to flow like a resistor", "false" ] }, { "ans": [ "The polarity of the plates alternates continuously", "false" ] } ] }, { "ch": "What is a key advantage of using mica as a dielectric in fixed capacitors?", "ansGr": [ { "ans": [ "It allows higher voltage resistance and prevents arcing", "true" ] }, { "ans": [ "It improves the capacitor's ability to conduct current", "false" ] }, { "ans": [ "It increases the magnetic field strength between plates", "false" ] } ] }, { "ch": "What happens when capacitors are connected in series?", "ansGr": [ { "ans": [ "The total capacitance is less than that of the smallest capacitor", "true" ] }, { "ans": [ "The total capacitance increases beyond the largest individual capacitor", "false" ] }, { "ans": [ "The voltage across each capacitor is always the same", "false" ] } ] }, { "ch": "What is Magnetism?", "ansGr": [ { "ans": [ "Magnetism is an invisible force", "true" ] }, { "ans": [ "Magnetism is an visible force", "false" ] }, { "ans": [ "Magnetism is an object to attract certain non-metallic substances", "false" ] } ] }, { "ch": "How is poles of the magnet called?", "ansGr": [ { "ans": [ "North and South", "true" ] }, { "ans": [ "North and West", "false" ] }, { "ans": [ "East and West", "false" ] } ] }, { "ch": "What is correct stament for the magnetic field?", "ansGr": [ { "ans": [ "Lines of force are separate, they remain parallel to one. another", "true" ] }, { "ans": [ "Lines of force are independent and cut each other", "false" ] }, { "ans": [ "Lines of force from the South to North", "false" ] } ] }, { "ch": "What is correct statement for Magnetic flux?", "ansGr": [ { "ans": [ "Exist in all space around the magnet", "true" ] }, { "ans": [ "Occupies the space around the magnet with equal flux density", "false" ] }, { "ans": [ "Is more concentrated at the centre of bar magnet", "false" ] } ] }, { "ch": "What is a temporary magnet?", "ansGr": [ { "ans": [ "Wich quickly lose most of their magnetism when the external magnetizing force is removed", "true" ] }, { "ans": [ "Which retain their magnetism long after the magnetizing force has been removed", "false" ] }, { "ans": [ "Which is made of special alloys such as Aluminium-Nickel- Cobalt (Alnicos).", "false" ] } ] }, { "ch": "What is the symbol for the intensity of the lines of force?", "ansGr": [ { "ans": [ "Φ", "true" ] }, { "ans": [ "F", "false" ] }, { "ans": [ "λ", "false" ] } ] }, { "ch": "What is aware when handling a magnet?", "ansGr": [ { "ans": [ "Avoid applying direct heat, or hammering or dropping it", "true" ] }, { "ans": [ "Applying direct heat or hammering", "false" ] }, { "ans": [ "Applying direct heat and avoid dropping it.", "false" ] } ] }, { "ch": "Two parallel lines of magnetic flux:", "ansGr": [ { "ans": [ "Repel each other", "true" ] }, { "ans": [ "Attract each other", "false" ] }, { "ans": [ "Have no effect on each othe", "false" ] } ] }, { "ch": "When does magnetic flux saturation takes place?", "ansGr": [ { "ans": [ "The magnetised medium will accept no further lines of flux", "true" ] }, { "ans": [ "The magnetic field starts to reduce with increased magnetising force", "false" ] }, { "ans": [ "The magnetic field drops to zero", "false" ] } ] }, { "ch": "What is way suppress eddy currents?", "ansGr": [ { "ans": [ "Use of permeable laminations in the magnetic material", "true" ] }, { "ans": [ "Use the solid magnetic material.", "false" ] }, { "ans": [ "Do not have any way.", "false" ] } ] }, { "ch": "Magnets lose their permanent magnetism until temperature is:", "ansGr": [ { "ans": [ "Below 300°C", "true" ] }, { "ans": [ "Above 30°C", "false" ] }, { "ans": [ "Above 400°C", "false" ] } ] }, { "ch": "Where should be the magnet stored?", "ansGr": [ { "ans": [ "In a dry place", "true" ] }, { "ans": [ "In a high humidity place", "false" ] }, { "ans": [ "Under the water", "false" ] } ] }, { "ch": "What happne when the magnetic field in a conductor is changed?", "ansGr": [ { "ans": [ "Eddy currents develop", "true" ] }, { "ans": [ "Eddy currents reduce", "false" ] }, { "ans": [ "Eddy currents not change", "false" ] } ] }, { "ch": "What happens to the molecular magnets in an unmagnetized iron bar when it is stroked with a lodestone?", "ansGr": [ { "ans": [ "The molecular magnets within the iron bar rearrange themselves to align with the magnetic field of the lodestone", "true" ] }, { "ans": [ "The molecular magnets within the iron bar rearrange themselves to align with the magnetic field of the earth", "false" ] }, { "ans": [ "The molecular magnets within the iron bar rearrange themselves to parallel with the magnetic field of the earth", "false" ] } ] }, { "ch": "The lines of force of the magnetic field of a magnet is", "ansGr": [ { "ans": [ "Concentrated at the ends of the magnet", "true" ] }, { "ans": [ "Attracted one another", "false" ] }, { "ans": [ "Cross each other", "false" ] } ] }, { "ch": "What happen when brought the north poles of two bar magnets near each other?", "ansGr": [ { "ans": [ "They repel each other", "true" ] }, { "ans": [ "They attract each other", "false" ] }, { "ans": [ "They do not interact to each other", "false" ] } ] }, { "ch": "What happens in a magnetic circuit when a magnetomotive force of one gilbert is applied to a material with a reluctance of one?", "ansGr": [ { "ans": [ "It will cause one maxwell", "true" ] }, { "ans": [ "It will cause some lines of force", "false" ] }, { "ans": [ "It will cause 1/10 maxwell", "false" ] } ] }, { "ch": "What happens when a magnetizing force is applied to a non-magnetized ferromagnetic material?", "ansGr": [ { "ans": [ "The flux density (magnetic field) of this material increases", "true" ] }, { "ans": [ "The flux density (magnetic field) of this material decreases", "false" ] }, { "ans": [ "The flux density (magnetic field) of this material does not change", "false" ] } ] }, { "ch": "Normally the north end of the compass needle would point to:", "ansGr": [ { "ans": [ "The south pole of the earth's magnetic pole", "true" ] }, { "ans": [ "The north pole of the earth's magnetic pole", "false" ] }, { "ans": [ "The north pole of the earth's true pole", "false" ] } ] }, { "ch": "What happen when the current flow through a conductor increase?", "ansGr": [ { "ans": [ "The magnetic field around the conductor increase", "true" ] }, { "ans": [ "The magnetic field around the conductor decrease", "false" ] }, { "ans": [ "The magnetic field around the conductor does not change", "false" ] } ] }, { "ch": "What is method used to determine the direction of the lines of force when the direction of the current flow is known?", "ansGr": [ { "ans": [ "The left-hand rule", "true" ] }, { "ans": [ "The right-hand rule", "false" ] }, { "ans": [ "The corkscrew rules", "false" ] } ] }, { "ch": "When the direction of the current flow change:", "ansGr": [ { "ans": [ "The direction of the lines of force change", "true" ] }, { "ans": [ "The direction of the lines of force does not change", "false" ] }, { "ans": [ "Amount of the lines of force change", "false" ] } ] }, { "ch": "How is the magnetic field around the conductor created?", "ansGr": [ { "ans": [ "When the electrons moving through the conductor", "true" ] }, { "ans": [ "When the protons moving through the conductor", "false" ] }, { "ans": [ "When the neutrons moving through the conductor", "false" ] } ] }, { "ch": "How identify the polarity of the coil which has a current flow?", "ansGr": [ { "ans": [ "By the left-hand rule", "true" ] }, { "ans": [ "By the right-hand rule", "false" ] }, { "ans": [ "By using current meter", "false" ] } ] }, { "ch": "Some electromagnetic devices operate on the principle that", "ansGr": [ { "ans": [ "An iron core held away from the centre of a coil will be rapidly pulled into a centre position when the coil is energized", "true" ] }, { "ans": [ "An copper core held away from the centre of a coil will be rapidly pulled into a centre position when the coil is energized", "false" ] }, { "ans": [ "An ceramic core held away from the centre of a coil will be rapidly pulled into a centre position when the coil is energized", "false" ] } ] }, { "ch": "Which is law state: \"The induced EMF or electromagnetic force in a closed loop of wire is proportional to the rate of change of the magnetic flux through a coil of wire\"?", "ansGr": [ { "ans": [ "Faraday", "true" ] }, { "ans": [ "Joule-Lenz", "false" ] }, { "ans": [ "Fleming", "false" ] } ] }, { "ch": "When current flows through any conductor:", "ansGr": [ { "ans": [ "A magnetic field starts to expand from the centre of the wire", "true" ] }, { "ans": [ "The lines of magnetic force grow from outward to center of the conductor", "false" ] }, { "ans": [ "The induced voltage is always in the direction with the direction of the current flow", "false" ] } ] }, { "ch": "What is the basic unit of inductance?", "ansGr": [ { "ans": [ "Henry (H)", "true" ] }, { "ans": [ "Omh (Ω)", "false" ] }, { "ans": [ "Fara (F)", "false" ] } ] }, { "ch": "The magnetic lines of force around loops when the loops are brought close together:", "ansGr": [ { "ans": [ "The magnetic lines of force between adjacent loops are in opposition with each other", "true" ] }, { "ans": [ "The magnetic lines of force between adjacent loops are the same dirction with each other", "false" ] }, { "ans": [ "The strength of the magnetic field will decrease", "false" ] } ] }, { "ch": "What is the physical factor that affect inductance?", "ansGr": [ { "ans": [ "The length of a coils", "true" ] }, { "ans": [ "The cross-sectional area of the conductor", "false" ] }, { "ans": [ "The length of the core which the coil is formed.", "false" ] } ] }, { "ch": "What is the total inductance of inductors wich are connected in series?", "ansGr": [ { "ans": [ "Is the sum of the individual inductors", "true" ] }, { "ans": [ "Is less than the smallest inductance", "false" ] }, { "ans": [ "Is less than the largest inductance", "false" ] } ] }, { "ch": "The induced EMF or electromagnetic force in a closed loop of wire is", "ansGr": [ { "ans": [ "Proportional to the rate of change of the magnetic flux through a coil of wire", "true" ] }, { "ans": [ "Revert proportional to the rate of change of the magnetic flux through a coil of wire", "false" ] }, { "ans": [ "Not depend to the rate of change of the magnetic flux through a coil of wire", "false" ] } ] }, { "ch": "What happens to the magnetic lines of force when the loops are placed closer together?", "ansGr": [ { "ans": [ "The strength of the magnetic field will increase", "true" ] }, { "ans": [ "The strength of the magnetic field will decrease", "false" ] }, { "ans": [ "The strength of the magnetic field does not change", "false" ] } ] }, { "ch": "What is the total inductance when inductors are connected in series?", "ansGr": [ { "ans": [ "Is the sum of the individual inductors", "true" ] }, { "ans": [ "Is less than the smallest inductance", "false" ] }, { "ans": [ "Is equal to the smallest inductance", "false" ] } ] }, { "ch": "What is the total inductance when inductors are connected in parallel?", "ansGr": [ { "ans": [ "Is less than the smallest inductance", "true" ] }, { "ans": [ "Is the sum of the individual inductors", "false" ] }, { "ans": [ "Is equal to the largest inductance", "false" ] } ] }, { "ch": "Determine inductive reactance of an AC series circuit which has the inductance is 0.146 Henry and the voltage is 11 volts at a frequency of 60 cycles per second.", "ansGr": [ { "ans": [ "Approximate 55 ohms", "true" ] }, { "ans": [ "Approximate 25 ohms", "false" ] }, { "ans": [ "Approximate 36 ohms", "false" ] } ] }, { "ch": "Determine current of an AC series circuit which has the inductance is 0.146 Henry and the voltage is 110 volts at a frequency of 60 cycles per second.", "ansGr": [ { "ans": [ "2A", "true" ] }, { "ans": [ "5A", "false" ] }, { "ans": [ "4A", "false" ] } ] }, { "ch": "What does Faraday's Law of Electromagnetic Induction state?", "ansGr": [ { "ans": [ "The induced voltage in a coil is proportional to the rate of change of magnetic flux through it", "true" ] }, { "ans": [ "The resistance of a coil determines the strength of its magnetic field", "false" ] }, { "ans": [ "A constant magnetic field induces a constant voltage", "false" ] } ] }, { "ch": "What is the symbol used to represent inductance in a circuit?", "ansGr": [ { "ans": [ "H", "true" ] }, { "ans": [ "F", "false" ] }, { "ans": [ "R", "false" ] } ] }, { "ch": "Three inductors are connected in series with values L₁ = 10 mH, L₂ = 5 mH, and L₃ = 2 mH, what is the total inductance?", "ansGr": [ { "ans": [ "17 mH", "true" ] }, { "ans": [ "1.25 mH", "false" ] }, { "ans": [ "1.75 mH", "false" ] } ] }, { "ch": "What is inductive reactance?", "ansGr": [ { "ans": [ "Is the opposition that an inductor presents to alternating current (AC) due to the constantly changing magnetic field around it", "true" ] }, { "ans": [ "Is the opposition that an inductor presents to direct current (DC) due to the constantly changing magnetic field around it", "false" ] }, { "ans": [ "Is the opposition that an inductor presents to alternating current (AC) or direct current (DC) due to the constantly changing magnetic field around it", "false" ] } ] }, { "ch": "Which is the correct statement?", "ansGr": [ { "ans": [ "The total reactance of inductors connected in parallel is the same way as the total resistance in a parallel circuit", "true" ] }, { "ans": [ "The total reactance of inductors connected in parallel is lower than the total resistance in a parallel circuit", "false" ] }, { "ans": [ "The total reactance of inductors connected in parallel is higher than the total resistance in a parallel circuit", "false" ] } ] }, { "ch": "Why does the current in a coil not immediately reach its maximum value when voltage is first applied?", "ansGr": [ { "ans": [ "Because a counter electromotive force (EMF) is induced, which opposes the change in current", "true" ] }, { "ans": [ "Because the coil’s resistance instantly increases with applied voltage", "false" ] }, { "ans": [ "Because inductance delays voltage buildup instead of current", "false" ] } ] }, { "ch": "What does DC generator do?", "ansGr": [ { "ans": [ "Transforms mechanical energy into electrical energy", "true" ] }, { "ans": [ "Transforms electrical energy into mechanical energy", "false" ] }, { "ans": [ "Transforms high electrical energy into low electrical energy", "false" ] } ] }, { "ch": "What is voltage induced in?", "ansGr": [ { "ans": [ "Armature", "true" ] }, { "ans": [ "Feeling part", "false" ] }, { "ans": [ "Rotating brush", "false" ] } ] }, { "ch": "Armature reaction is countered by:", "ansGr": [ { "ans": [ "Two methods", "true" ] }, { "ans": [ "One method", "false" ] }, { "ans": [ "Three methods", "false" ] } ] }, { "ch": "What are the major parts of a DC generator?", "ansGr": [ { "ans": [ "A field frame, a rotating armature, and a brush assembly", "true" ] }, { "ans": [ "A field frame, a rotating armature, a brush assembly, and a cooling fan", "false" ] }, { "ans": [ "A field frame, a rotating armature, a brush assembly, and one constant speed driver", "false" ] } ] }, { "ch": "Where is the commutator located?", "ansGr": [ { "ans": [ "At the end of an armature", "true" ] }, { "ans": [ "At the forward of a field frame", "false" ] }, { "ans": [ "At the rear of a field frame", "false" ] } ] }, { "ch": "How may types of DC generator are there?", "ansGr": [ { "ans": [ "3", "true" ] }, { "ans": [ "2", "false" ] }, { "ans": [ "4", "false" ] } ] }, { "ch": "Normally, The DC generator installed on the airplane has the output voltage is:", "ansGr": [ { "ans": [ "14 or 28 volts", "true" ] }, { "ans": [ "115 volt", "false" ] }, { "ans": [ "110 Volt", "false" ] } ] }, { "ch": "What does DC motor do?", "ansGr": [ { "ans": [ "Transforms the DC electrical energy into mechanical energy", "true" ] }, { "ans": [ "Transforms mechanical energy into the DC electrical energy", "false" ] }, { "ans": [ "Transforms high DC electrical energy into low DC electrical energy", "false" ] } ] }, { "ch": "How may types of DC motor are there?", "ansGr": [ { "ans": [ "3", "true" ] }, { "ans": [ "2", "false" ] }, { "ans": [ "4", "false" ] } ] }, { "ch": "What are factors affect to the output valtage of a DC generator?", "ansGr": [ { "ans": [ "The speed of the conductor and the strength of the magnetic field", "true" ] }, { "ans": [ "The strength of the magnetic field only", "false" ] }, { "ans": [ "The speed of the conductor only", "false" ] } ] }, { "ch": "When the plane of the loop of wire is parallel to the magnetic lines of force", "ansGr": [ { "ans": [ "The voltage induced in the loop is maximum", "true" ] }, { "ans": [ "The voltage induced in the loop is minimum", "false" ] }, { "ans": [ "The current induced in the loop is minimum", "false" ] } ] }, { "ch": "What are the primary elements of the armature assembly of a DC generator?", "ansGr": [ { "ans": [ "The wire coils and the commutator assembly", "true" ] }, { "ans": [ "The wire coils and a permanent magnet", "false" ] }, { "ans": [ "The commutator assembly and a permanent magnet", "false" ] } ] }, { "ch": "What is way to reduce ripple in the output voltage of the DC generator?", "ansGr": [ { "ans": [ "Increasing number coils", "true" ] }, { "ans": [ "Decreasing number coils", "false" ] }, { "ans": [ "Increasing number brushs", "false" ] } ] }, { "ch": "What is correct statement for compensation windings?", "ansGr": [ { "ans": [ "Compensation windings are coils connected in series with the armature coils", "true" ] }, { "ans": [ "Compensation windings are coils connected in parallel with the armature coils", "false" ] }, { "ans": [ "Creates a small voltage drop across the armature", "false" ] } ] }, { "ch": "What is correct statement for interpoles?", "ansGr": [ { "ans": [ "Compensation windings are coils connected in series with the armature coils", "true" ] }, { "ans": [ "Compensation windings are coils connected in parallel with the armature coils", "false" ] }, { "ans": [ "Creates a small voltage drop across the armature", "false" ] } ] }, { "ch": "How many functions of the field frame?", "ansGr": [ { "ans": [ "2", "true" ] }, { "ans": [ "1", "false" ] }, { "ans": [ "3", "false" ] } ] }, { "ch": "What is the material commonly used for brushes?", "ansGr": [ { "ans": [ "High-grade carbon", "true" ] }, { "ans": [ "High-grade coppe", "false" ] }, { "ans": [ "Aluminium alloy", "false" ] } ] }, { "ch": "How is friction of the commutator reduced?", "ansGr": [ { "ans": [ "The commutator surface is highly polished as much as possible", "true" ] }, { "ans": [ "Grease must never be on a commutator", "false" ] }, { "ans": [ "Oil must be used on a commutator", "false" ] } ] }, { "ch": "What is a series wound DC generator?", "ansGr": [ { "ans": [ "Is a generator which contains a field winding connected in series with the external circuit", "true" ] }, { "ans": [ "Is a shunt generator", "false" ] }, { "ans": [ "Is a compound wound generator", "false" ] } ] }, { "ch": "When the rotation direction of generatoris reversed:", "ansGr": [ { "ans": [ "The polarity of the output voltage is reversed", "true" ] }, { "ans": [ "The polarity of the output voltage does not change", "false" ] }, { "ans": [ "The output voltage is decreased", "false" ] } ] }, { "ch": "What happen when a current flows in a wire that is placed in the field of a magnet?", "ansGr": [ { "ans": [ "There is a force acts on the wire", "true" ] }, { "ans": [ "The wire will be repelled to the north pole of the magnet", "false" ] }, { "ans": [ "The wire will be repelled to the south pole of the magnet", "false" ] } ] }, { "ch": "Which is correct statement?", "ansGr": [ { "ans": [ "Motor speed can be controlled by varying the current in the field windings", "true" ] }, { "ans": [ "By reversing the direction of current flow in either the armature or the field windings, the direction of a motor's rotation may be not reversed", "false" ] }, { "ans": [ "When the field current is decreased, the motor speeds up because the counter EMF is increased", "false" ] } ] }, { "ch": "What is a shunt DC motor?", "ansGr": [ { "ans": [ "That the field winding is connected in parallel or in shunt with the armature winding", "true" ] }, { "ans": [ "That the field windings, consisting of a relatively few turns of heavy wire, are connected in series with the armature winding", "false" ] }, { "ans": [ "That there are two windings in the field", "false" ] } ] }, { "ch": "The armature resistance of a small, 28-volt DC motor is extremely low, about 0.1 ohm. When the armature is connected across the 28-volt source. How many amperes of the current through the armature are there?", "ansGr": [ { "ans": [ "28 amperes", "true" ] }, { "ans": [ "280 amperes", "false" ] }, { "ans": [ "56 amperes", "false" ] } ] }, { "ch": "What device is used to convert alternating current, which has been induced into the loops of the rotating armature of a DC generator into direct current as it leaves the generator?", "ansGr": [ { "ans": [ "A commutator", "true" ] }, { "ans": [ "An inverter", "false" ] }, { "ans": [ "A rectifier", "false" ] } ] }, { "ch": "How transfer the electrical energy from the rotating loop of a DC generator to the stationary aircraft loads?", "ansGr": [ { "ans": [ "Using two half cylinders (the commutator) and brushes", "true" ] }, { "ans": [ "Using slip rings and brushes", "false" ] }, { "ans": [ "Using a slip ring and two brushes", "false" ] } ] }, { "ch": "What are the major parts in a practical motor?", "ansGr": [ { "ans": [ "The field assembly, the brush assembly, and the end frame", "true" ] }, { "ans": [ "A field frame, a rotating armature, a brush assembly, and a cooling fan", "false" ] }, { "ans": [ "A field frame, a rotating armature, a brush assembly, and one constant speed driver", "false" ] } ] }, { "ch": "What are the primary elements of the armature assembly of a DC motor?", "ansGr": [ { "ans": [ "A laminated soft iron core, coils, and a commutator", "true" ] }, { "ans": [ "The wire coils, a rotatable steel shaft, and a permanent magnet", "false" ] }, { "ans": [ "The commutator assembly, a rotatable steel shaft, and a permanent magnet", "false" ] } ] }, { "ch": "Where is the field frame of the DC motor located?", "ansGr": [ { "ans": [ "Along the inner wall of the motor housing", "true" ] }, { "ans": [ "On a rotatable steel shaft", "false" ] }, { "ans": [ "on the armature assembly", "false" ] } ] }, { "ch": "What is correct statement for electric motors?", "ansGr": [ { "ans": [ "Motors built for intermittent duty can be operated for short periods only and, then, must be allowed to cool before being operated again", "true" ] }, { "ans": [ "Motors built for intermittent duty can be operated for long periods only and no need to cool before being operated again", "false" ] }, { "ans": [ "Motors built for intermittent duty can be operated for long periods only and, then, must be allowed to cool before being operated again", "false" ] } ] }, { "ch": "How can the ripple in the output voltage of a DC generator be reduced?", "ansGr": [ { "ans": [ "By using more loops, or coils and commutator segments", "true" ] }, { "ans": [ "By using the slip rings", "false" ] }, { "ans": [ "By using two half cylinders (the commutator)", "false" ] } ] }, { "ch": "What is armature reaction in a DC generator?", "ansGr": [ { "ans": [ "Armature reaction is a phenomenon that occurs as a result of magnetic flux produced by the armature windings when armature current flows", "true" ] }, { "ans": [ "Armature reaction is the process of converting AC voltage to DC voltage in a generator", "false" ] }, { "ans": [ "Armature reaction is the increase in voltage caused by the armature windings in a DC generator.", "false" ] } ] }, { "ch": "What is correct statement for series DC motor?", "ansGr": [ { "ans": [ "The field windings, consisting of a relatively few turns of heavy wire, are connected in series with the armature winding", "true" ] }, { "ans": [ "The speed of a series motor is not dependent upon the load", "false" ] }, { "ans": [ "A series motor will run at high speed when it has a heavy load", "false" ] } ] }, { "ch": "In a shunt generator", "ansGr": [ { "ans": [ "Any increase in load causes a decrease in the output voltage", "true" ] }, { "ans": [ "Any increase in load causes a increase in the output voltage", "false" ] }, { "ans": [ "All the current flowing in the external circuit passes only through the field winding", "false" ] } ] }, { "ch": "How can the output voltage of a shunt generator be regulated?", "ansGr": [ { "ans": [ "By using a rheostat inserted in series with the field windings", "true" ] }, { "ans": [ "By using a rheostat inserted in paralell with the field windings", "false" ] }, { "ans": [ "By using a rheostat inserted in series with the armature windings", "false" ] } ] }, { "ch": "How can the direction of a DC motor's rotation may be reversed?", "ansGr": [ { "ans": [ "By reversing the direction of current flow in either the armature or the field windings", "true" ] }, { "ans": [ "By interchange the wires connecting the motor to an external source", "false" ] }, { "ans": [ "By adding more armature windings to the motor", "false" ] } ] }, { "ch": "One advantage of using AC electrical power in aircraft is.", "ansGr": [ { "ans": [ "Space and weight can be saved, since AC devices, especially motors, are smaller and simpler than DC devices.", "true" ] }, { "ans": [ "AC electrical motors can be reversed while DC motors cannot", "false" ] }, { "ans": [ "The effective voltage is 1.41 times the maximum instantaneous voltage; therefore, less power input is required.", "false" ] } ] }, { "ch": "What is alternating current?", "ansGr": [ { "ans": [ "A.Is an electric current that periodically reverses direction and changes its magnitude continuously with time.", "true" ] }, { "ans": [ "A.It flows in a single direction steadily.", "false" ] }, { "ans": [ "A.Has no frequency or zero frequency", "false" ] } ] }, { "ch": "What is correct statement?", "ansGr": [ { "ans": [ "Whenever a voltage or current passes through a series of changes, returns to the starting point, and then again starts the same series of changes, the series is called a cycle", "true" ] }, { "ans": [ "The frequency is the number of cycles of alternating current per unit of time", "false" ] }, { "ans": [ "The time required for a sine wave to complete half of a cycle is called a period", "false" ] } ] }, { "ch": "What is relationship between frequency and period?", "ansGr": [ { "ans": [ "The period of a sine wave is inversely proportional to the frequency", "true" ] }, { "ans": [ "The period of a sine wave is proportional to the frequency", "false" ] }, { "ans": [ "The period of a sine wave is inversely proportional to two time of the frequency", "false" ] } ] }, { "ch": "What is a wavelength?", "ansGr": [ { "ans": [ "The wavelength is the distance that a waveform travels during a period", "true" ] }, { "ans": [ "The wavelength is the distance that a waveform travels from maximum to minimum of a cycle", "false" ] }, { "ans": [ "The wavelength is the distance that a waveform travels from zero to maximum of a cycle", "false" ] } ] }, { "ch": "What is in phase condition?", "ansGr": [ { "ans": [ "The two waveforms must go through their maximum and minimum points at the same time and in the same direction.", "true" ] }, { "ans": [ "The two waveforms go through their maximum and minimum points at different times", "false" ] }, { "ans": [ "The two waveforms must go through their maximum and minimum points at the same time but in difference direction.", "false" ] } ] }, { "ch": "What is the peak value?", "ansGr": [ { "ans": [ "Is the largest instantaneous value", "true" ] }, { "ans": [ "Is a value of voltage or current is the induced voltage or current flowing at any instant during a cycle", "false" ] }, { "ans": [ "Is the average of all the instantaneous values during one half cycle", "false" ] } ] }, { "ch": "What is the effective value?", "ansGr": [ { "ans": [ "Being equal to 0.707 times the maximum value", "true" ] }, { "ans": [ "Being equal to two times the maximum value", "false" ] }, { "ans": [ "Being equal to 0.5 times the maximum value", "false" ] } ] }, { "ch": "A wave form having equal amplitude and time base is a.", "ansGr": [ { "ans": [ "Square waveform", "true" ] }, { "ans": [ "Saw tooth", "false" ] }, { "ans": [ "Rectangular", "false" ] } ] }, { "ch": "What happen when moving a conductor in a magnetic field?", "ansGr": [ { "ans": [ "A voltage is induced in each side of the conductor.", "true" ] }, { "ans": [ "Nothing happen.", "false" ] }, { "ans": [ "The direction of the magnetic field is reversed.", "false" ] } ] }, { "ch": "A conductor moving in the magnetic field, the sides of the conductor have exchanged positions:", "ansGr": [ { "ans": [ "The induced EMF in each wire reverses its direction", "true" ] }, { "ans": [ "The induced EMF in each wire not change its direction.", "false" ] }, { "ans": [ "The resistance of the conductor decrease.", "false" ] } ] }, { "ch": "The value of an induced EMF depends on", "ansGr": [ { "ans": [ "The number of wires.", "true" ] }, { "ans": [ "Cross area of wires.", "false" ] }, { "ans": [ "The number of wires and Cross area of wires.", "false" ] } ] }, { "ch": "A sin wave has frequency is 400 Hz. How is period of wave?", "ansGr": [ { "ans": [ "0.0025", "true" ] }, { "ans": [ "1.1", "false" ] }, { "ans": [ "0.66", "false" ] } ] }, { "ch": "The 110-volt value given for alternating current supplied to homes is only 0.707 of the maximum voltage of this supply. The maximum voltage is", "ansGr": [ { "ans": [ "155V", "true" ] }, { "ans": [ "77,77V", "false" ] }, { "ans": [ "220V", "false" ] } ] }, { "ch": "What is law states: \"The induced current caused by the relative motion of a conductor and a magnetic field always flows in such a direction that its magnetic field opposes the motion\"?", "ansGr": [ { "ans": [ "Lenz", "true" ] }, { "ans": [ "Faraday", "false" ] }, { "ans": [ "Coulomb", "false" ] } ] }, { "ch": "What is rule can be used to determine the direction of the induced EMF?", "ansGr": [ { "ans": [ "The generator left-hand rule", "true" ] }, { "ans": [ "The generator right-hand rule", "false" ] }, { "ans": [ "Corkscrew rule", "false" ] } ] }, { "ch": "How is the value of an induced EMF of a conductor loop when the plane of the conductor loop is paralleled with the magnetic field?", "ansGr": [ { "ans": [ "Maximum Voltage", "true" ] }, { "ans": [ "Minimum voltage", "false" ] }, { "ans": [ "Between maximum and minimum voltage", "false" ] } ] }, { "ch": "How is the induced EMF in the conductor when the rotation speed of the conductor in a magnetic field increase?", "ansGr": [ { "ans": [ "Insrease", "true" ] }, { "ans": [ "Decrease", "false" ] }, { "ans": [ "Does not change", "false" ] } ] }, { "ch": "The instantaneous value of the voltage varies from", "ansGr": [ { "ans": [ "Zero at 0° to maximum at 90°, back to zero at 180°, to maximum in the opposite direction at 270°, and to zero again at 360°", "true" ] }, { "ans": [ "Zero at 0° to maximum at 180°, and to zero again at 360°", "false" ] }, { "ans": [ "Zero at 0° to maximum at 270°, and to zero again at 360°", "false" ] } ] }, { "ch": "What is the peak voltage of an alternating current with an RMS value of 110V?", "ansGr": [ { "ans": [ "155V", "true" ] }, { "ans": [ "77V", "false" ] }, { "ans": [ "115V", "false" ] } ] }, { "ch": "What is the RMS value of an alternating current with a peak voltage of 310V?", "ansGr": [ { "ans": [ "220V", "true" ] }, { "ans": [ "380V", "false" ] }, { "ans": [ "115V", "false" ] } ] }, { "ch": "How is relationship between two waveform, if Voltage source one (W1) starts to rise at the 0° position and voltage source two (W2) starts to rise at the 90° position", "ansGr": [ { "ans": [ "W1 Waveform leads W2 Waveform", "true" ] }, { "ans": [ "W1 Waveform lags W2 Waveform", "false" ] }, { "ans": [ "Two W1 & W2 Waveforms differ by 180°", "false" ] } ] }, { "ch": "What is the period of the output voltage of a 2-pole generator rotating at 3600 RPM?", "ansGr": [ { "ans": [ "1/60 seconds", "true" ] }, { "ans": [ "60 seconds", "false" ] }, { "ans": [ "1/30 seconds", "false" ] } ] }, { "ch": "What is the frequency of a voltage that increases from zero to a maximum positive value, decreases to zero, reaches a maximum negative value, and then returns to zero?", "ansGr": [ { "ans": [ "The frequency of this voltage is 0.5 Hz", "true" ] }, { "ans": [ "The frequency of this voltage is 1 Hz", "false" ] }, { "ans": [ "The frequency of this voltage is 2 Hz", "false" ] } ] }, { "ch": "The voltage increases from zero to a maximum positive value, decreases to zero; then increases to a maximum negative value, and again decreases to zero is called", "ansGr": [ { "ans": [ "A cycle", "true" ] }, { "ans": [ "The frequency", "false" ] }, { "ans": [ "A period", "false" ] } ] }, { "ch": "When the condouctor are formed into a loop, the loop conductor is now moving perpendicular to the flux and cuts a maximum number of lines of force", "ansGr": [ { "ans": [ "A maximum voltage is induced", "true" ] }, { "ans": [ "A minimum voltage is induced", "false" ] }, { "ans": [ "The induced voltage is zero", "false" ] } ] }, { "ch": "When a loop conductor is rotated in a magnetic field, if the speed of rotation is increasd", "ansGr": [ { "ans": [ "The induced EMF is increased", "true" ] }, { "ans": [ "The induced EMF is decreased", "false" ] }, { "ans": [ "The induced EMF not depend on speed of rotation", "false" ] } ] }, { "ch": "Several turns of a conductor are wrapped around a cylindrical form and the ends of the conductor are connected together to form a complete circuit, which includes a galvanometer, if the magnet is at rest inside the cylinder", "ansGr": [ { "ans": [ "The galvanometer shows a reading of zero", "true" ] }, { "ans": [ "", "false" ] }, { "ans": [ "", "false" ] } ] }, { "ch": "If an AC circuit consists of resistance only, what is the value of the impedance ?", "ansGr": [ { "ans": [ "Equal to the sum of the resistances", "true" ] }, { "ans": [ "Equal to the square root of the sum of the squared resistances", "false" ] }, { "ans": [ "Equal to the square root of the sum of the resistances", "false" ] } ] }, { "ch": "What is unit for the measurement of impedance?", "ansGr": [ { "ans": [ "Ohm", "true" ] }, { "ans": [ "Fara", "false" ] }, { "ans": [ "Henry", "false" ] } ] }, { "ch": "What is letter represented for impedance?", "ansGr": [ { "ans": [ "Z", "true" ] }, { "ans": [ "Q", "false" ] }, { "ans": [ "R", "false" ] } ] }, { "ch": "What is correct statement?", "ansGr": [ { "ans": [ "In a series AC circuit, resistance and reactance cannot be added directly", "true" ] }, { "ans": [ "When AC circuits contain resistance and either inductance or capacitance, the impedance is the same as the resistance", "false" ] }, { "ans": [ "Since the inductive reactance causes the current through the coil to lag the voltage by 180°", "false" ] } ] }, { "ch": "The inductive reactance of the coil is computed:", "ansGr": [ { "ans": [ "XL = 2ΠfL", "true" ] }, { "ans": [ "XL = ΠfL", "false" ] }, { "ans": [ "XL = 2fL", "false" ] } ] }, { "ch": "The formula for impedance in a series circuit is the root of:", "ansGr": [ { "ans": [ "R2 + (XL-XC)2", "true" ] }, { "ans": [ "R2 -(XL-XC)2", "false" ] }, { "ans": [ "R2 + (XC-XL)2", "false" ] } ] }, { "ch": "A series circuit consisting of resistance and inductance connected in series is connected to a source of 110 volts at 60 cycles per second. The resistive element is a lamp with 6 ohms resistance, and the inductive element is a coil with an inductance of 0.021 henry. What is the value of the impedance and the current through the lamp and the coil?", "ansGr": [ { "ans": [ "10 ohms", "true" ] }, { "ans": [ "5 ohms", "false" ] }, { "ans": [ "20 ohms", "false" ] } ] }, { "ch": "A series circuit is illustrated in which a capacitor of 200 μf is connected in series with a 10-ohm lamp. What is the value of the impedance?", "ansGr": [ { "ans": [ "16.4 ohms", "true" ] }, { "ans": [ "12 ohms", "false" ] }, { "ans": [ "24 ohms", "false" ] } ] }, { "ch": "What is the impedance of a series circuit, consisting of a capacitor with a reactance of 7 ohms, an inductor with a reactance of 10 ohms, and a resistor with a resistance of 4 ohms?", "ansGr": [ { "ans": [ "5 ohms", "true" ] }, { "ans": [ "3 ohms", "false" ] }, { "ans": [ "7 ohms", "false" ] } ] }, { "ch": "A series circuit consisting of resistance and inductance connected in series is connected to a source of 110 volts at 60 cycles per second. The resistive element is a lamp with 6 ohms resistance, and the inductive element is a coil with an inductance of 0.021 henry. What is the value the current through the lamp and the coil?", "ansGr": [ { "ans": [ "0.458333333333333", "true" ] }, { "ans": [ "0.416666666666667", "false" ] }, { "ans": [ "12A", "false" ] } ] }, { "ch": "A 110-volt generator is connected to a load consisting of a 2 μf capacitance and a 10 000- ohm resistance in parallel. What is the value of the impedance?", "ansGr": [ { "ans": [ "1315 ohms", "true" ] }, { "ans": [ "315 ohms", "false" ] }, { "ans": [ "2315 ohms", "false" ] } ] }, { "ch": "If an AC circuit contains resistance and inductance, the formula for impedance in a series circuit is the root of:", "ansGr": [ { "ans": [ "R2 + XL2", "true" ] }, { "ans": [ "R2 - XL2", "false" ] }, { "ans": [ "R2 * XL2", "false" ] } ] }, { "ch": "How are inductive and capacitive reactance affected by changes in the frequency of an alternating current?", "ansGr": [ { "ans": [ "Decreasing the frequency decreases the ohmic value of the inductive reactance, but a decrease in frequency increases the capacitive reactance", "true" ] }, { "ans": [ "Decreasing the frequency increases the ohmic value of the inductive reactance, but a decrease in frequency decreases the capacitive reactance", "false" ] }, { "ans": [ "Decreasing the frequency increases the ohmic value of the inductive reactance and the capacitive reactance", "false" ] } ] }, { "ch": "A 220-volt AC motor takes 50 amperes from the line, but a wattmeter in the line shows that only 9 350 watts are taken by the motor. What is the power factor (PF?", "ansGr": [ { "ans": [ "85 0r 85%", "true" ] }, { "ans": [ "93,5 or 93,5%", "false" ] }, { "ans": [ "11 or 11%", "false" ] } ] }, { "ch": "What is the impedance of a series circuit, consisting of a capacitor with a reactance of 10 Ω, an inductor with a reactance of 10 Ω, and a resistor with a resistance of 5 Ω?", "ansGr": [ { "ans": [ "5Ω", "true" ] }, { "ans": [ "10Ω", "false" ] }, { "ans": [ "10Ω", "false" ] } ] }, { "ch": "What does transformer do?", "ansGr": [ { "ans": [ "Changes electrical energy of a given voltage into electrical energy at a different voltage level", "true" ] }, { "ans": [ "Changes electrical energy into mechanical energy", "false" ] }, { "ans": [ "Changes mechanical energy into electrical energy", "false" ] } ] }, { "ch": "A transformer consists of two coils:", "ansGr": [ { "ans": [ "These coils are not electrically connected", "true" ] }, { "ans": [ "These coils are electrically connected in series", "false" ] }, { "ans": [ "These coils are electrically connected in parallel", "false" ] } ] }, { "ch": "A transformer can also be used with:", "ansGr": [ { "ans": [ "AC voltage", "true" ] }, { "ans": [ "DC voltage", "false" ] }, { "ans": [ "Either AC or DC voltage", "false" ] } ] }, { "ch": "What are basic parts of a transformer?", "ansGr": [ { "ans": [ "An iron core, a primary winding, and a secondary winding", "true" ] }, { "ans": [ "An plastic core, a primary winding, and a secondary winding", "false" ] }, { "ans": [ "An copper core, a primary winding, and a secondary winding", "false" ] } ] }, { "ch": "What is unit for the \"reactive power\" of a transformer?", "ansGr": [ { "ans": [ "W", "true" ] }, { "ans": [ "VA", "false" ] }, { "ans": [ "Vah", "false" ] } ] }, { "ch": "What is correct stament?", "ansGr": [ { "ans": [ "The primary coils are connected in parallel across the supply voltage", "true" ] }, { "ans": [ "The primary coils are connected in parallel across the load", "false" ] }, { "ans": [ "The secondary coils are connected in parallel across the supply voltage", "false" ] } ] }, { "ch": "What is a step-down transformer?", "ansGr": [ { "ans": [ "The number of turns in the primary winding more than the number of turns in the secondary winding", "true" ] }, { "ans": [ "The number of turns in the primary winding less than the number of turns in the secondary winding", "false" ] }, { "ans": [ "The number of turns in the primary winding equal to the number of turns in the secondary winding", "false" ] } ] }, { "ch": "What is a step-up transformer?", "ansGr": [ { "ans": [ "The number of turns in the primary winding less than the number of turns in the secondary winding", "true" ] }, { "ans": [ "The number of turns in the primary winding more than the number of turns in the secondary winding", "false" ] }, { "ans": [ "The number of turns in the primary winding equal to the number of turns in the secondary winding", "false" ] } ] }, { "ch": "A step-down transforme has the \"turns\" ratio is 5 to 1, if 40 watts of power are used in the primary coil. How is power developed in the secondary coil?", "ansGr": [ { "ans": [ "40 W", "true" ] }, { "ans": [ "8 W", "false" ] }, { "ans": [ "200 W", "false" ] } ] }, { "ch": "A step-down transforme has the \"turns\" ratio is 10 to 1 and the number of turn of the primary coil is 50 rounds. Power supply is 110V. How the secondary output voltage?", "ansGr": [ { "ans": [ "11 V", "true" ] }, { "ans": [ "5.5 V", "false" ] }, { "ans": [ "55V", "false" ] } ] }, { "ch": "What is perpose of the current transformer?", "ansGr": [ { "ans": [ "is used in AC power supply systems to sense generator line current and to provide a current", "true" ] }, { "ans": [ "Is used in AC power supply systems to sense generator line output voltage and to provide a current", "false" ] }, { "ans": [ "Is used in AC power supply systems to sense generator line output voltage and to voltage information", "false" ] } ] }, { "ch": "A transformer with no load, how will be the secondary current?", "ansGr": [ { "ans": [ "No current", "true" ] }, { "ans": [ "Increase", "false" ] }, { "ans": [ "The same the primary current", "false" ] } ] }, { "ch": "What is correct statement for a transformer?", "ansGr": [ { "ans": [ "There cannot be more power in the secondary side of a transformer than there is in the primary", "true" ] }, { "ans": [ "An increase in voltage by the transformer must result in a increase in current", "false" ] }, { "ans": [ "With no load, secondary current will be equal the primary current", "false" ] } ] }, { "ch": "What is the apparent power of a transformer if the input voltage is 115V, the real power is 2 kW, and the power factor is 1?", "ansGr": [ { "ans": [ "2 kVA", "true" ] }, { "ans": [ "230 kVA", "false" ] }, { "ans": [ "17 kVA", "false" ] } ] }, { "ch": "Why must the secondary of a current transformer not be left open during system operation?", "ansGr": [ { "ans": [ "It may produce dangerously high voltage and overheat the transformer", "true" ] }, { "ans": [ "It will result in current backflow into the generator", "false" ] }, { "ans": [ "It will cause reverse polarity and system shutdown", "false" ] } ] }, { "ch": "What can be used for filtering the output of a rectifier?", "ansGr": [ { "ans": [ "Inductor", "true" ] }, { "ans": [ "Resistor", "false" ] }, { "ans": [ "Resistor and Capacitor", "false" ] } ] }, { "ch": "For filtering the output of a rectifier:", "ansGr": [ { "ans": [ "The capacitor is connected in parallel with the load", "true" ] }, { "ans": [ "The capacitor is connected in series with the load", "false" ] }, { "ans": [ "The capacitor is connected to input of the rectifier", "false" ] } ] }, { "ch": "How many the basic categories of filters are there?", "ansGr": [ { "ans": [ "3", "true" ] }, { "ans": [ "4", "false" ] }, { "ans": [ "5", "false" ] } ] }, { "ch": "What is a low-pass filter?", "ansGr": [ { "ans": [ "That passes low frequencies well", "true" ] }, { "ans": [ "That passes low voltage well", "false" ] }, { "ans": [ "That passes low current well", "false" ] } ] }, { "ch": "A band −pass filter consists of:", "ansGr": [ { "ans": [ "A high−pass filter and a low−pass filter in parallel", "true" ] }, { "ans": [ "A high−pass filter and a low−pass filter in series", "false" ] }, { "ans": [ "Tow high−pass filters in parallel", "false" ] } ] }, { "ch": "What is a band-stop filter?", "ansGr": [ { "ans": [ "That passes most frequencies unaltered, but attenuates those in a range to very low levels", "true" ] }, { "ans": [ "That passes most voltage unaltered, but attenuates those in a range to very low levels", "false" ] }, { "ans": [ "That passes most current unaltered, but attenuates those in a range to very low levels", "false" ] } ] }, { "ch": "A generator which produces alternating current is", "ansGr": [ { "ans": [ "AC generator", "true" ] }, { "ans": [ "DC generator", "false" ] }, { "ans": [ "DC generator or alternator", "false" ] } ] }, { "ch": "How many phase of output current which a AC generator can produce?", "ansGr": [ { "ans": [ "Single phase, two phase, three phase, or even six phase and more", "true" ] }, { "ans": [ "Single phase or four phases", "false" ] }, { "ans": [ "Four phases or six phases", "false" ] } ] }, { "ch": "What is efficient of the brushless alternator?", "ansGr": [ { "ans": [ "No brushes to wear down or to arc at high altitudes", "true" ] }, { "ans": [ "The brushes is difficult to wear down or to arc at high altitudes", "false" ] }, { "ans": [ "Easy to replace the brushes", "false" ] } ] }, { "ch": "What is effective power of a generator?", "ansGr": [ { "ans": [ "Watts (W)", "true" ] }, { "ans": [ "Volt-amperes (VA)", "false" ] }, { "ans": [ "Amperes - hours (Ah)", "false" ] } ] }, { "ch": "The frequency of the alternator voltage depends upon", "ansGr": [ { "ans": [ "The speed of rotation of the rotor and the number of poles", "true" ] }, { "ans": [ "The number of poles and mount of exciting current.", "false" ] }, { "ans": [ "The speed of rotation of the rotor and mount of exciting voltage", "false" ] } ] }, { "ch": "A transistorized voltage regulator that used to control the alternator output consists mainly of:", "ansGr": [ { "ans": [ "Transistors, diodes, resistors, capacitors, and, usually, a thermistor", "true" ] }, { "ans": [ "Transistors, diodes, inductor, and, usually, a thermistor", "false" ] }, { "ans": [ "Transistors, inductor, resistors, capacitors, and, usually, a thermistor", "false" ] } ] }, { "ch": "What is function of the inverter?", "ansGr": [ { "ans": [ "Is used to convert a portion of the aircraft's DC power to AC power", "true" ] }, { "ans": [ "Is used to convert a portion of the aircraft's AC power to DC power", "false" ] }, { "ans": [ "Changes electrical energy of a given voltage into electrical energy at a different voltage level", "false" ] } ] }, { "ch": "How many basic types of inverters are there?", "ansGr": [ { "ans": [ "2", "true" ] }, { "ans": [ "3", "false" ] }, { "ans": [ "4", "false" ] } ] }, { "ch": "The shape of the output waveform of an AC generator is known as a:", "ansGr": [ { "ans": [ "Sine wave", "true" ] }, { "ans": [ "Cosine wave", "false" ] }, { "ans": [ "Frequency wave", "false" ] } ] }, { "ch": "What is method of excitaion when a AC generator is exited from DC generator which fixed on the same shaft with the AC generator?", "ansGr": [ { "ans": [ "A direct connected, direct current generator method", "true" ] }, { "ans": [ "Ttransformation and rectification from the AC system method", "false" ] }, { "ans": [ "Integrated brushless type method", "false" ] } ] }, { "ch": "What is correct statement for a single phase alternator?", "ansGr": [ { "ans": [ "Has a stator made up of a number of windings in series", "true" ] }, { "ans": [ "The windings are separate from each other and spaced between them 90°", "false" ] }, { "ans": [ "three single windings and spaced between them 120°", "false" ] } ] }, { "ch": "In a delta connection", "ansGr": [ { "ans": [ "the line voltages are equal to the phase voltages", "true" ] }, { "ans": [ "he line voltage is 1.73 times the phase voltage", "false" ] }, { "ans": [ "the line current is equal to the phase current", "false" ] } ] }, { "ch": "The brushless alternator has:", "ansGr": [ { "ans": [ "Rectifier bridge located inside the rotor shaft", "true" ] }, { "ans": [ "The pilot exciter field is mounted on the pilot exciter armature and is connected in series with the main generator field", "false" ] }, { "ans": [ "Rectifier bridge mounted on the pilot exciter armature.", "false" ] } ] }, { "ch": "A alternator has two pole, 3 600 rpm. It has a frequency is:", "ansGr": [ { "ans": [ "60 cps", "true" ] }, { "ans": [ "25 cps", "false" ] }, { "ans": [ "400 cps", "false" ] } ] }, { "ch": "What is method to regulate the output voltage of a generator?", "ansGr": [ { "ans": [ "Regulate the strength of the exciting current", "true" ] }, { "ans": [ "Regulate the weight of the exciting winding", "false" ] }, { "ans": [ "Regulate the strength of the exciting current or Regulate the weight of the exciting winding", "false" ] } ] }, { "ch": "If the overvoltage is detected by GCU:", "ansGr": [ { "ans": [ "The overvoltage protection circuit of GCU is used to open the relay that controls the output for the field excitation", "true" ] }, { "ans": [ "The overvoltage protection circuit of GCU is used to close the relay that controls the output for the field excitation", "false" ] }, { "ans": [ "The overvoltage protection circuit of GCU is used to disconnect generator away from driver shaft.", "false" ] } ] }, { "ch": "The constant speed drive enables the alternator:", "ansGr": [ { "ans": [ "To produce the same frequency at slightly above engine idle rpm as it would at take-off or cruising rpm", "true" ] }, { "ans": [ "To produce the same output voltage at slightly above engine idle rpm as it would at take-off or cruising rpm", "false" ] }, { "ans": [ "To produce the same current at slightly above engine idle rpm as it would at take-off or cruising rpm", "false" ] } ] }, { "ch": "How many primary units of the cylinder assembly of a hydraulic transmission that is mounted between the generator and the aircraft engine?", "ansGr": [ { "ans": [ "2", "true" ] }, { "ans": [ "3", "false" ] }, { "ans": [ "3", "false" ] } ] }, { "ch": "What is best way to control the output voltage of an alternator?", "ansGr": [ { "ans": [ "Regulating the voltage output of a DC exciter, which supplies current to the alternator rotor field", "true" ] }, { "ans": [ "Regulating speed of the alternator rotor", "false" ] }, { "ans": [ "Regulating power of the load", "false" ] } ] }, { "ch": "When AC generators are operated in parallel:", "ansGr": [ { "ans": [ "Frequency and voltage must both be equal", "true" ] }, { "ans": [ "Frequency must both be equal but voltage is not", "false" ] }, { "ans": [ "Voltage must both be equal but frequency is not", "false" ] } ] }, { "ch": "The AC exciter generator is used to control the AC output of the generator, If the output voltage is less than a reference voltage:", "ansGr": [ { "ans": [ "Field strength of the AC exciter generator is increased", "true" ] }, { "ans": [ "Field strength of the AC exciter generator is reduced", "false" ] }, { "ans": [ "Field of the AC exciter generator is cut-off", "false" ] } ] }, { "ch": "For the permanent magnet rotory inverter, to get the AC output voltage from a permanent magnet AC generator:", "ansGr": [ { "ans": [ "The brushes are no needed", "true" ] }, { "ans": [ "The brushes are needed", "false" ] }, { "ans": [ "A commutator is needed", "false" ] } ] }, { "ch": "An AC generator is producing the required voltage but a higher frequency than that required. To remedy this, the following action must be taken?", "ansGr": [ { "ans": [ "Decrease the speed of the prime mover, and then increase the strength of the field", "true" ] }, { "ans": [ "Decrease the speed of the prime mover", "false" ] }, { "ans": [ "Decrease the speed of the prime mover, and then decrease the strength of the field", "false" ] } ] }, { "ch": "An AC generator has four poles. To produce a frequency of 400Hz it must achieve a speed of", "ansGr": [ { "ans": [ "12000 RPM", "true" ] }, { "ans": [ "8000 RPM", "false" ] }, { "ans": [ "6000 RPM", "false" ] } ] }, { "ch": "The voltage of an AC generator:", "ansGr": [ { "ans": [ "Rises to max in one direction then falls to zero then rises to max in the opposite direction", "true" ] }, { "ans": [ "Rises to max in one direction, falls to zero and rises in the same direction", "false" ] }, { "ans": [ "Rises to max in one direction and remains", "false" ] } ] }, { "ch": "In a 3 phase generator, what angle are the phases to each other?", "ansGr": [ { "ans": [ "120o", "true" ] }, { "ans": [ "180o", "false" ] }, { "ans": [ "90o", "false" ] } ] }, { "ch": "What is type of the inverter that has an essentially AC generator and A DC motor in one housing?", "ansGr": [ { "ans": [ "The rotary inverter", "true" ] }, { "ans": [ "The static inverter", "false" ] }, { "ans": [ "The hybrib inverter", "false" ] } ] }, { "ch": "What happen if the output voltage of a generator is not within the specified tolerance?", "ansGr": [ { "ans": [ "The GCU will control to open the generator line contactor.", "true" ] }, { "ans": [ "The GCU will control to close the generator line contactor.", "false" ] }, { "ans": [ "The GCU will control to close the generator line contactor if generator overload", "false" ] } ] }, { "ch": "What is the most basic of the GCU functions?", "ansGr": [ { "ans": [ "Is used to regulate the output voltage of the generator", "true" ] }, { "ans": [ "Is used to regulate current of the external load.", "false" ] }, { "ans": [ "Is used to regulate the output voltage of the generator and regulate current of the external load.", "false" ] } ] }, { "ch": "What is main function of a constant speed drive which is installed between the engine and the alternator?", "ansGr": [ { "ans": [ "To keep speed of alternator not change", "true" ] }, { "ans": [ "To keep output voltage of alternator not change", "false" ] }, { "ans": [ "To keep output current of alternator not change", "false" ] } ] }, { "ch": "How does the overvoltage protection system in the GCU operate?", "ansGr": [ { "ans": [ "The output of the overvoltage protection circuit is used to open the relay that controls the output for the field excitation", "true" ] }, { "ans": [ "The overvoltage protection system increases the field excitation output when the sampled voltage is too high", "false" ] }, { "ans": [ "The output of the overvoltage protection circuit is used to close the relay that increase the output for the field excitation", "false" ] } ] }, { "ch": "When the GCU allows the logic output to close the generator line contactor, the generator voltage must be", "ansGr": [ { "ans": [ "Within a close tolerance of the load bus", "true" ] }, { "ans": [ "Within a less than tolerance of the load bus", "false" ] }, { "ans": [ "Within a than tolerance of the load bus", "false" ] } ] }, { "ch": "What is correct statement for a delta connection generator?", "ansGr": [ { "ans": [ "The voltages are equal to the phase voltages", "true" ] }, { "ans": [ "The voltage across each load connected across two phases is larger than the voltage across a single phase", "false" ] }, { "ans": [ "The voltage across each load connected across two phases is smaller than the voltage across a single phase", "false" ] } ] }, { "ch": "What is correct statement for a WYE connection generator?", "ansGr": [ { "ans": [ "The line voltage is 1.73 times the phase voltage", "true" ] }, { "ans": [ "The phase voltage is 1.73 times the line voltage", "false" ] }, { "ans": [ "The phase voltage is equal to the line voltage", "false" ] } ] }, { "ch": "What is correct statement for a delta connection generator?", "ansGr": [ { "ans": [ "The line current is equal to 1.73 times the phase current", "true" ] }, { "ans": [ "The phase current is equal to 1.73 times the line current", "false" ] }, { "ans": [ "The phase current is equal to the line current", "false" ] } ] }, { "ch": "What is correct statement for a brushless generator?", "ansGr": [ { "ans": [ "The exciter is a small AC generator with its field mounted on the main generator stator", "true" ] }, { "ans": [ "The AC output of the rotating exciter armature is fed directly into the single phase, full-wave, rectifier bridge located inside the rotor shaft", "false" ] }, { "ans": [ "The DC output from the rectifier bridge is fed to the pilot exciter amature", "false" ] } ] }, { "ch": "The speed of rotation of an AC motor depends upon:", "ansGr": [ { "ans": [ "The number of poles and the frequency of the electrical source of power", "true" ] }, { "ans": [ "The number of coils and the frequency of the electrical source of power", "false" ] }, { "ans": [ "the number of poles and the number of coils of the electrical source of power", "false" ] } ] }, { "ch": "What are general types of AC motors used in aircraft systems?", "ansGr": [ { "ans": [ "Induction motors and synchronous motors", "true" ] }, { "ans": [ "Induction motors and insynchronous motors", "false" ] }, { "ans": [ "insynchronous motors only", "false" ] } ] }, { "ch": "A single-phase motor has:", "ansGr": [ { "ans": [ "One stator winding", "true" ] }, { "ans": [ "Two stator windings", "false" ] }, { "ans": [ "three stator windings", "false" ] } ] }, { "ch": "In the three phase AC motor has 6 poles and whose windings are energized by three AC voltages:", "ansGr": [ { "ans": [ "if pole 1 be considered as a north pole, pole 4 will as a south pole", "true" ] }, { "ans": [ "if pole 1 be considered as a north pole, pole 4 will as a north pole", "false" ] }, { "ans": [ "if pole 1 be considered as a north pole, pole 2 and 6 will as a south poles", "false" ] } ] }, { "ch": "If the exciting voltages have a frequency of 60 cps, the magnetic field makes 60 revolutions per second, or 3 600 rpm. This speed is known as", "ansGr": [ { "ans": [ "The synchronous speed of the rotating field", "true" ] }, { "ans": [ "The indudtion motor", "false" ] }, { "ans": [ "The insynchronous speed of the rotating field", "false" ] } ] }, { "ch": "Three phase motor with a rated speed of 1750 rpm, consider a 60 cycle:", "ansGr": [ { "ans": [ "The motor has four poles per phase", "true" ] }, { "ans": [ "The motor has two poles per phase", "false" ] }, { "ans": [ "The motor has six poles per phase", "false" ] } ] }, { "ch": "What is correct statement for the AC series motor?", "ansGr": [ { "ans": [ "The AC series motor will operate on either AC or DC circuits", "true" ] }, { "ans": [ "An alternating current series motor is a three-phase motor", "false" ] }, { "ans": [ "The compensating winding of the AC series motor is connected in parallel with the armature", "false" ] } ] }, { "ch": "What is correct statement for the synchronous motor?", "ansGr": [ { "ans": [ "Since a synchronous motor has little starting torque, some means must be provided to bring it up to synchronous speed", "true" ] }, { "ans": [ "The synchronous motor is a self-starting motor and can start with full load", "false" ] }, { "ans": [ "The synchronous motor consists of a stator field winding this winding produces a static magnetic field", "false" ] } ] }, { "ch": "A capacitor in a single phase AC motor is to:", "ansGr": [ { "ans": [ "Provide a phase shift", "true" ] }, { "ans": [ "Prevent sparkes", "false" ] }, { "ans": [ "Increase current of the starting winding", "false" ] } ] }, { "ch": "What is affect to the speed of an AC motor?", "ansGr": [ { "ans": [ "Pairs of poles", "true" ] }, { "ans": [ "Field current", "false" ] }, { "ans": [ "Armature current", "false" ] } ] }, { "ch": "What is the slip speed of an induction motor?", "ansGr": [ { "ans": [ "A difference in speed between the rotor and the rotating field", "true" ] }, { "ans": [ "Is a average value of the rotor and the rotating field", "false" ] }, { "ans": [ "is proportion of the rotor and the rotating field", "false" ] } ] }, { "ch": "What is an alternating current series motor?", "ansGr": [ { "ans": [ "It resembles a DC motor in that it has brushes and a commutator", "true" ] }, { "ans": [ "Is a three-phase motor, but is not an induction or synchronous motor", "false" ] }, { "ans": [ "It resembles a DC motor in that it has no brushes and a commutator", "false" ] } ] } ]