[ { "ch": "Which element is the most widely used material in semiconductor devices?", "ansGr": [ { "ans": [ "Silicon", "true" ] }, { "ans": [ "Gallium", "false" ] }, { "ans": [ "Carbon", "false" ] } ] }, { "ch": "What is the outermost orbital shell of an atom called?", "ansGr": [ { "ans": [ "Valence shell", "true" ] }, { "ans": [ "Core shell", "false" ] }, { "ans": [ "Electron cloud", "false" ] } ] }, { "ch": "What is the process of adding impurities to silicon called?", "ansGr": [ { "ans": [ "Doping", "true" ] }, { "ans": [ "Melting", "false" ] }, { "ans": [ "Crystallization", "false" ] } ] }, { "ch": "In N-type material, what are considered the majority carriers?", "ansGr": [ { "ans": [ "Electrons", "true" ] }, { "ans": [ "Holes", "false" ] }, { "ans": [ "Neutrons", "false" ] } ] }, { "ch": "What is the main reason that solid-state devices are more reliable in avionics compared to vacuum tubes?", "ansGr": [ { "ans": [ "They are less prone to failure due to long life and resilience in extreme conditions.", "true" ] }, { "ans": [ "They have a cathode heater that prevents damage in harsh environments.", "false" ] }, { "ans": [ "They can dissipate more power while using higher operating voltages.", "false" ] } ] }, { "ch": "How does Electro-Static Discharge (ESD) damage a semiconductor component?", "ansGr": [ { "ans": [ "By generating excess heat that breaks down the dielectric material inside the component.", "true" ] }, { "ans": [ "By grounding the semiconductor, causing it to stop functioning temporarily.", "false" ] }, { "ans": [ "By inducing a current that temporarily overloads the semiconductor’s circuits.", "false" ] } ] }, { "ch": "What are compound semiconductors and how are they formed?", "ansGr": [ { "ans": [ "They are synthesized from two or more elements from groups II through VI of the periodic table.", "true" ] }, { "ans": [ "They are naturally occurring semiconductors formed from groups IV and V elements of the periodic table.", "false" ] }, { "ans": [ "They are a combination of silicon and germanium used for high-speed semiconductor devices.", "false" ] } ] }, { "ch": "How does the number of electrons in an atom's valence shell affect its electrical properties?", "ansGr": [ { "ans": [ "Atoms with an incomplete valence shell tend to have free electrons that move easily between atoms.", "true" ] }, { "ans": [ "Atoms with an incomplete valence shell tend to resist the flow of electrons, making them good insulators", "false" ] }, { "ans": [ "Atoms with a full valence shell tend to have free electrons that move easily between atoms.", "false" ] } ] }, { "ch": "What is a covalent bond in the context of electron behavior in valence shells?", "ansGr": [ { "ans": [ "A bond where two or more atoms share valence electrons to complete their valence shells.", "true" ] }, { "ans": [ "A bond where electrons are transferred from one atom to another, creating free electrons.", "false" ] }, { "ans": [ "A bond formed when atoms have a full valence shell, making them chemically stable.", "false" ] } ] }, { "ch": "Which of the following describes the movement of electrons in N-type semiconductors?", "ansGr": [ { "ans": [ "Electrons move from valence shell to valence shell, and holes are the minority carriers.", "true" ] }, { "ans": [ "Electrons move from hole to hole, and electrons are the minority carriers.", "false" ] }, { "ans": [ "Holes move from valence shell to valence shell, and electrons are the minority carriers.", "false" ] } ] }, { "ch": "What is the difference between electron movement and hole movement in P-type material?", "ansGr": [ { "ans": [ "Electrons move through a series of holes, while holes appear to move in the opposite direction of electron flow.", "true" ] }, { "ans": [ "Electrons move to the right while holes move to the left.", "false" ] }, { "ans": [ "Holes move to the right as they gain electrons, and electrons are stationary.", "false" ] } ] }, { "ch": "How does a semiconductor diode function as a rectifier when AC current is applied?", "ansGr": [ { "ans": [ "Current flows during one cycle of the sine wave but not during the other cycle", "true" ] }, { "ans": [ "It allows current to flow continuously in both directions", "false" ] }, { "ans": [ "It blocks both halves of the AC cycle", "false" ] } ] }, { "ch": "How can a diode’s parameters be checked?", "ansGr": [ { "ans": [ "By consulting the manufacturer’s specification or data sheet", "true" ] }, { "ans": [ "By checking the diode’s color and packaging", "false" ] }, { "ans": [ "By measuring resistance with a digital voltmeter", "false" ] } ] }, { "ch": "How can the forward current in a diode be limited?", "ansGr": [ { "ans": [ "Connecting a resistor in series with the diode", "true" ] }, { "ans": [ "Connecting a resistor in parallel with the diode", "false" ] }, { "ans": [ "Connecting a capacitor in parallel with the diode", "false" ] } ] }, { "ch": "What is the term for the highest average amount of current that a diode can conduct in the forward- biased condition without being damaged?", "ansGr": [ { "ans": [ "Maximum Forward Current", "true" ] }, { "ans": [ "Zener Breakdown Current", "false" ] }, { "ans": [ "Reverse Leakage Current", "false" ] } ] }, { "ch": "What is the Maximum (Peak or Surge) Forward Current (IFSM) of a diode?", "ansGr": [ { "ans": [ "The highest forward current the diode can briefly withstand as a pulse without damage", "true" ] }, { "ans": [ "The maximum reverse current the diode can block before failing", "false" ] }, { "ans": [ "The continuous current rating for standard forward-biased operation", "false" ] } ] }, { "ch": "What is the term for the highest voltage a diode can withstand in reverse bias without breaking down or being damaged?", "ansGr": [ { "ans": [ "Maximum Reverse Voltage (VR)", "true" ] }, { "ans": [ "Forward threshold voltage drop", "false" ] }, { "ans": [ "Maximum Forward Voltage Drop", "false" ] } ] }, { "ch": "What is the Maximum Reverse Current (IR) in a semiconductor diode?", "ansGr": [ { "ans": [ "The small leakage current that flows during reverse bias", "true" ] }, { "ans": [ "The highest current allowed during forward bias", "false" ] }, { "ans": [ "The surge current during diode breakdown", "false" ] } ] }, { "ch": "What does the reverse recovery time (trr) of a diode refer to?", "ansGr": [ { "ans": [ "The time it takes for a diode to \"turn off \"after it switches from being forward-biased to reverse- biased", "true" ] }, { "ans": [ "The time required for a diode to start conducting in forward bias", "false" ] }, { "ans": [ "The time it takes to heat the diode to its maximum junction temperature", "false" ] } ] }, { "ch": "What does Total Power Dissipation refer to in a semiconductor diode?", "ansGr": [ { "ans": [ "The maximum power the diode can safely dissipate as heat when conducting in forward bias", "true" ] }, { "ans": [ "The heat generated due to leakage current in reverse bias", "false" ] }, { "ans": [ "The amount of energy stored in the diode’s junction during operation", "false" ] } ] }, { "ch": "What does the first number in a diode’s device code indicate?", "ansGr": [ { "ans": [ "Indicates the number of junctions in the semiconductor device", "true" ] }, { "ans": [ "Indicates the size of diode", "false" ] }, { "ans": [ "Indicates the maximum current flow", "false" ] } ] }, { "ch": "In a diode code like 1N4148, what does the letter \"N\" represent?", "ansGr": [ { "ans": [ "A semiconductor device", "true" ] }, { "ans": [ "A diode with negative polarity", "false" ] }, { "ans": [ "A non specific diode", "false" ] } ] }, { "ch": "In a diode code like 2N2222M, what does the letter \"M\" represent?", "ansGr": [ { "ans": [ "Describe matching pairs of separate semiconductor devices", "true" ] }, { "ans": [ "A diode with modified voltage drop characteristics", "false" ] }, { "ans": [ "A metal-encapsulated diode for mechanical durability", "false" ] } ] }, { "ch": "In a diode code like 2N2152R, what does the letter \"R\" represent?", "ansGr": [ { "ans": [ "Indicate reverse polarity", "true" ] }, { "ans": [ "Indicate the device has reduced power dissipation", "false" ] }, { "ans": [ "Indicate the device is a resistor-integrated diode", "false" ] } ] }, { "ch": "Where are standard color code bands placed on a diode?", "ansGr": [ { "ans": [ "On the cathode end of the diode", "true" ] }, { "ans": [ "Near the center of the diode", "false" ] }, { "ans": [ "On the anode end of the diode", "false" ] } ] }, { "ch": "What is a common use of a Zener diode in an electronic circuit?", "ansGr": [ { "ans": [ "To drop or regulate voltage at a specific level", "true" ] }, { "ans": [ "To reverse the polarity of the circuit", "false" ] }, { "ans": [ "To amplify input current", "false" ] } ] }, { "ch": "What is the primary purpose of a signal diode in an electronic circuit?", "ansGr": [ { "ans": [ "To handle high-frequency in the digital circuits", "true" ] }, { "ans": [ "To regulate voltage in power supplies", "false" ] }, { "ans": [ "To convert AC to DC in high-current applications", "false" ] } ] }, { "ch": "How does light energy enable current flow in a photodiode?", "ansGr": [ { "ans": [ "Photons striking the semiconductor free electrons, creating electron-hole pairs that allow current to flow in the depletion region", "true" ] }, { "ans": [ "When a photon strikes a semiconductor atom, it reduce the energy level what is needed to hold its electrons in orbit", "false" ] }, { "ans": [ "The light generates heat, which reduces the diode's resistance between the PN junction and allowing current to flow", "false" ] } ] }, { "ch": "What happens when electrons fall into the valence band in a light-emitting diode (LED)?", "ansGr": [ { "ans": [ "They radiate energy, which may be released as light", "true" ] }, { "ans": [ "They generate magnetic fields that control current", "false" ] }, { "ans": [ "They absorb photons and increase in energy", "false" ] } ] }, { "ch": "Which of the following characteristics best describes a Schottky diode compared to a conventional PN junction diode?", "ansGr": [ { "ans": [ "It uses a metal-semiconductor junction with no charge storage, resulting in faster switching", "true" ] }, { "ans": [ "It is a bipolar device that operates with both electrons and holes", "false" ] }, { "ans": [ "It has a higher forward voltage drop and slower reverse recovery time than a standard diode", "false" ] } ] }, { "ch": "What does it mean for a PN junction to be \"unbiased\"?", "ansGr": [ { "ans": [ "No external voltage is applied to the junction.", "true" ] }, { "ans": [ "The current is flowing through the junction.", "false" ] }, { "ans": [ "A voltage is applied to the junction.", "false" ] } ] }, { "ch": "What forms the depletion zone in an unbiased PN junction?", "ansGr": [ { "ans": [ "Fixed positive and negative ions near the junction that do not move", "true" ] }, { "ans": [ "Holes that drift into the N-region", "false" ] }, { "ans": [ "Moving electrons and holes", "false" ] } ] }, { "ch": "When a diode is forward biased, what happens to the depletion zone?", "ansGr": [ { "ans": [ "It becomes narrower.", "true" ] }, { "ans": [ "It disappears completely.", "false" ] }, { "ans": [ "It becomes wider.", "false" ] } ] }, { "ch": "In a forward-biased PN junction, what is the minimum voltage required for current flow to start in a silicon semiconductor?", "ansGr": [ { "ans": [ "0.7 volts", "true" ] }, { "ans": [ "0.3 volts", "false" ] }, { "ans": [ "0.5 volts", "false" ] } ] }, { "ch": "What occurs when a diode is reverse biased?", "ansGr": [ { "ans": [ "The depletion zone widens.", "true" ] }, { "ans": [ "The potential hill decreases.", "false" ] }, { "ans": [ "Holes move toward the junction.", "false" ] } ] }, { "ch": "What is the main effect observed in a reverse-biased PN junction?", "ansGr": [ { "ans": [ "Wider depletion zone.", "true" ] }, { "ans": [ "Increased current flow.", "false" ] }, { "ans": [ "Reduced depletion zone.", "false" ] } ] }, { "ch": "What is the significance of the maximum reverse voltage rating for a diode?", "ansGr": [ { "ans": [ "It prevents PN junction breakdown.", "true" ] }, { "ans": [ "It indicates forward current capacity.", "false" ] }, { "ans": [ "It determines the maximum temperature.", "false" ] } ] }, { "ch": "In the identification type 1N345A, what does the suffix letter \"A\" signify?", "ansGr": [ { "ans": [ "The diode is an improved version.", "true" ] }, { "ans": [ "The diode has a higher current rating.", "false" ] }, { "ans": [ "The diode is a standard version.", "false" ] } ] }, { "ch": "In a seven-segment display, how is the number \"9\" produced when using a common-anode configuration?", "ansGr": [ { "ans": [ "By applying negative voltage to all cathodes except LED \"E\"", "true" ] }, { "ans": [ "By applying voltage to the common anode", "false" ] }, { "ans": [ "By connecting all segments together.", "false" ] } ] }, { "ch": "Why is the Schottky diode particularly suited for high-frequency applications?", "ansGr": [ { "ans": [ "It has no depletion zone or charge storage, resulting in faster switching times.", "true" ] }, { "ans": [ "It has a higher forward voltage drop compared to silicon diodes.", "false" ] }, { "ans": [ "It can handle higher reverse voltages than traditional diodes.", "false" ] } ] }, { "ch": "How does the capacitance of a varactor diode change with applied reverse bias voltage?", "ansGr": [ { "ans": [ "It decreases with an increase in reverse bias.", "true" ] }, { "ans": [ "It remains constant regardless of reverse bias.", "false" ] }, { "ans": [ "It increases with an increase in reverse bias.", "false" ] } ] }, { "ch": "In a double-end clipper circuit, what happens when the AC input voltage exceeds the limits set by VB1 and VB2?", "ansGr": [ { "ans": [ "Diode D1 conducts if the input exceeds VB1, and D2 conducts if it exceeds VB2", "true" ] }, { "ans": [ "Both diodes conduct, clipping the output", "false" ] }, { "ans": [ "The circuit becomes an open circuit", "false" ] } ] }, { "ch": "In a half-wave rectifier circuit, when is the diode forward biased?", "ansGr": [ { "ans": [ "When the AC sine wave is positive", "true" ] }, { "ans": [ "When the AC sine wave is negative", "false" ] }, { "ans": [ "When there is no voltage applied", "false" ] } ] }, { "ch": "What happens to the depletion region in a varactor diode when it is forward biased?", "ansGr": [ { "ans": [ "The depletion region narrows, reducing junction resistance and allowing a large current to flow", "true" ] }, { "ans": [ "The bias voltage is stored as charge in the junction, increasing capacitance", "false" ] }, { "ans": [ "The depletion region widens, increasing junction resistance and blocking current flow", "false" ] } ] }, { "ch": "What is the primary function of the base terminal in a Bipolar Junction Transistor (BJT)?", "ansGr": [ { "ans": [ "To control the current flow between the collector and emitter", "true" ] }, { "ans": [ "To provide thermal management for the transistor", "false" ] }, { "ans": [ "To connect the transistor to the internal and external circuit", "false" ] } ] }, { "ch": "Why might two different ohmmeters provide varying resistance readings when testing the same transistor?", "ansGr": [ { "ans": [ "Different meters use varying current levels and internal resistances", "true" ] }, { "ans": [ "Ohmmeters can only detect open or short circuits, not resistance values", "false" ] }, { "ans": [ "Transistor polarity changes based on the meter used", "false" ] } ] }, { "ch": "What is the basic structure of a transistor made from semiconductor materials?", "ansGr": [ { "ans": [ "Two P-type layers with an N-type layer in between or vice versa", "true" ] }, { "ans": [ "A combination of metallic and ceramic materials", "false" ] }, { "ans": [ "A single layer of N-type semiconductor material", "false" ] } ] }, { "ch": "What is formed at the junctions of P-type and N-type semiconductor materials in a transistor?", "ansGr": [ { "ans": [ "Depletion regions that create potential barriers for charge flow", "true" ] }, { "ans": [ "Depletion regions that create magnetic barriers that resist voltage", "false" ] }, { "ans": [ "Depletion regions that assist electron movement", "false" ] } ] }, { "ch": "How many terminals does a transistor have?", "ansGr": [ { "ans": [ "3", "true" ] }, { "ans": [ "2", "false" ] }, { "ans": [ "4", "false" ] } ] }, { "ch": "How does a transistor behave when operating in the active region between cut-off and saturation?", "ansGr": [ { "ans": [ "It amplifies the input signal", "true" ] }, { "ans": [ "It acts like a closed switch", "false" ] }, { "ans": [ "It blocks all current flow", "false" ] } ] }, { "ch": "When does a transistor act like a switch?", "ansGr": [ { "ans": [ "When it is operating in the saturation region", "true" ] }, { "ans": [ "When it is operating in the cut-off region", "false" ] }, { "ans": [ "When it is operating in the active region", "false" ] } ] }, { "ch": "What are transistors with two junctions of P-type and N-type materials called?", "ansGr": [ { "ans": [ "Bipolar Junction Transistors (BJT)", "true" ] }, { "ans": [ "Field Effect Transistors (FET)", "false" ] }, { "ans": [ "Insulated Gate Bipolar Transistors (IGBT)", "false" ] } ] }, { "ch": "In a round transistor case, how can the collector be identified?", "ansGr": [ { "ans": [ "It is connected to the metal case or marked with a color dot", "true" ] }, { "ans": [ "It is the longest lead among the three", "false" ] }, { "ans": [ "It is always the far-right lead", "false" ] } ] }, { "ch": "In an oval transistor case, how is the collector lead identified?", "ansGr": [ { "ans": [ "It has the widest spacing from the other two leads", "true" ] }, { "ans": [ "It has a dot above it", "false" ] }, { "ans": [ "It is the shortest lead", "false" ] } ] }, { "ch": "What does a short lead on a transistor often indicate?", "ansGr": [ { "ans": [ "Emitter", "true" ] }, { "ans": [ "Collector", "false" ] }, { "ans": [ "Base", "false" ] } ] }, { "ch": "In a TO-5 case used for a conventional power diode, where is the collector lead located?", "ansGr": [ { "ans": [ "As part of the mounting base", "true" ] }, { "ans": [ "Marked by a notch on the case", "false" ] }, { "ans": [ "It is the middle lead", "false" ] } ] }, { "ch": "What is a Shockley diode?", "ansGr": [ { "ans": [ "A diode with four layers and three junctions.", "true" ] }, { "ans": [ "A diode that requires no applied voltage to operate.", "false" ] }, { "ans": [ "A diode with three junctions and two transistors.", "false" ] } ] }, { "ch": "What happens to the emitter-base depletion area of a BJT when voltage is applied to the base?", "ansGr": [ { "ans": [ "The depletion area narrows, enabling current to flow from the collector to the emitter.", "true" ] }, { "ans": [ "The depletion area widens, allowing more current to flow through the transistor.", "false" ] }, { "ans": [ "The depletion area disappears, creating a direct path for current flow.", "false" ] } ] }, { "ch": "How does the configuration of electrodes in a UJT affect its operation?", "ansGr": [ { "ans": [ "The voltage applied to the emitter must exceed the voltage at a specific point on the base for current to flow.", "true" ] }, { "ans": [ "The placement of electrodes does not influence the current flow through the device.", "false" ] }, { "ans": [ "The electrodes need to be connected to a collector to function properly.", "false" ] } ] }, { "ch": "What distinguishes enhancement mode MOSFETs from depletion mode MOSFETs?", "ansGr": [ { "ans": [ "Enhancement mode MOSFETs create a channel with applied gate voltage.", "true" ] }, { "ans": [ "Enhancement mode MOSFETs allow current flow without a gate voltage.", "false" ] }, { "ans": [ "Depletion mode MOSFETs are always on without voltage.", "false" ] } ] }, { "ch": "What is a key advantage of using a triac over an SCR?", "ansGr": [ { "ans": [ "It allows current flow in both directions.", "true" ] }, { "ans": [ "It can operate only at low voltage levels.", "false" ] }, { "ans": [ "It requires a continuous power supply to operate.", "false" ] } ] }, { "ch": "How does the gate trigger current flow in a triac?", "ansGr": [ { "ans": [ "By applying a positive or negative pulse to the gate terminal.", "true" ] }, { "ans": [ "By applying a positive or negative pulse to the gate terminal.", "false" ] }, { "ans": [ "By maintaining a constant voltage at the output.", "false" ] } ] }, { "ch": "Which statement is true regarding the common-collector configuration?", "ansGr": [ { "ans": [ "It is often referred to as an emitter-follower.", "true" ] }, { "ans": [ "It has low input resistance and high output resistance.", "false" ] }, { "ans": [ "It provides the highest power gain among configurations.", "false" ] } ] }, { "ch": "What is the primary characteristic of Class A amplifiers?", "ansGr": [ { "ans": [ "They provide the best fidelity with minimal distortion.", "true" ] }, { "ans": [ "They only amplify the negative portion of the input signal.", "false" ] }, { "ans": [ "They operate for only 50 percent of the input signal.", "false" ] } ] }, { "ch": "How does a Class B amplifier differ from a Class A amplifier?", "ansGr": [ { "ans": [ "It reproduces only the negative portion of the input signal.", "true" ] }, { "ans": [ "It is less efficient than Class A amplifiers in operation.", "false" ] }, { "ans": [ "It operates for 100 percent of the input signal.", "false" ] } ] }, { "ch": "What is a key advantage of Class C amplifiers?", "ansGr": [ { "ans": [ "They have greater efficiency compared to Class A and AB amplifiers.", "true" ] }, { "ans": [ "They are commonly used for continuous signal reproduction.", "false" ] }, { "ans": [ "They produce signals with high fidelity and low distortion.", "false" ] } ] }, { "ch": "What is the main advantage of using cascade amplifiers in a circuit?", "ansGr": [ { "ans": [ "To achieve higher voltage gain through multiple stages.", "true" ] }, { "ans": [ "To stabilize the circuit's power consumption.", "false" ] }, { "ans": [ "To amplify multiple input signals at once.", "false" ] } ] }, { "ch": "How does direct coupling affect the frequency response of an amplifier circuit?", "ansGr": [ { "ans": [ "It provides a stable frequency response due to the absence of capacitors.", "true" ] }, { "ans": [ "It increases the frequency response by using fewer reactive components.", "false" ] }, { "ans": [ "It decreases the frequency response by using inductive components.", "false" ] } ] }, { "ch": "What is the role of the transformer in the output stage of a push-pull amplifier?", "ansGr": [ { "ans": [ "To combine two out-of-phase signals into one amplified sine wave output signal.", "true" ] }, { "ans": [ "To reduce harmonic distortion and provide input signals for the transistors.", "false" ] }, { "ans": [ "To provide a stable power supply for both transistors to operate simultaneously.", "false" ] } ] }, { "ch": "What is one of the main disadvantages of a push-pull amplifier?", "ansGr": [ { "ans": [ "It requires a well-regulated power supply and cannot use self-biasing.", "true" ] }, { "ans": [ "It must operate with continuous current and requires a high-power supply.", "false" ] }, { "ans": [ "It has low signal distortion but requires more complex components.", "false" ] } ] }, { "ch": "What is the main purpose of automatic bias control in oscillator circuits?", "ansGr": [ { "ans": [ "To maintain constant amplitude by reducing gain when oscillations increase.", "true" ] }, { "ans": [ "To provide a strong feedback signal and ensure continuous oscillations.", "false" ] }, { "ans": [ "To increase the amplitude of oscillations and stabilize frequency.", "false" ] } ] }, { "ch": "What is the key distinguishing feature of the Colpitts oscillator compared to the Hartley oscillator?", "ansGr": [ { "ans": [ "The Colpitts oscillator uses a voltage divider made of two capacitors for feedback.", "true" ] }, { "ans": [ "The Colpitts oscillator uses automatic bias control to stabilize the frequency.", "false" ] }, { "ans": [ "The Colpitts oscillator uses a DC-blocking inductor in the feedback loop.", "false" ] } ] }, { "ch": "In an astable multivibrator, what determines the time period of each switching state?", "ansGr": [ { "ans": [ "The RC time constant of the resistor-capacitor networks.", "true" ] }, { "ans": [ "The type of transistors used in the circuit.", "false" ] }, { "ans": [ "The frequency of the power supply", "false" ] } ] }, { "ch": "What is the primary characteristic of Class A amplifiers?", "ansGr": [ { "ans": [ "They provide the best fidelity with minimal distortion.", "true" ] }, { "ans": [ "They only amplify the negative portion of the input signal.", "false" ] }, { "ans": [ "They operate for only 50 percent of the input signal.", "false" ] } ] }, { "ch": "What can the movement of electrons and holes in a semiconductor be considered as?", "ansGr": [ { "ans": [ "Current", "true" ] }, { "ans": [ "Voltage", "false" ] }, { "ans": [ "Resistance", "false" ] } ] }, { "ch": "What causes the emitter-base depletion region to narrow in a PNP resistor?", "ansGr": [ { "ans": [ "Voltage from the emitter-base battery forcing electrons and holes together", "true" ] }, { "ans": [ "Voltage from the emitter-base battery accumulate holes in the collector", "false" ] }, { "ans": [ "Voltage from the emitter-base battery accumulate holes in the emiter", "false" ] } ] }, { "ch": "What happens to the emitter-base depletion region when base voltage is removed?", "ansGr": [ { "ans": [ "It becomes too wide and stops current flow", "true" ] }, { "ans": [ "It becomes very narrow and allows more current to flow", "false" ] }, { "ans": [ "It becomes very narrow and stops current flow", "false" ] } ] }, { "ch": "What base does the binary numbering system use?", "ansGr": [ { "ans": [ "2", "true" ] }, { "ans": [ "3", "false" ] }, { "ans": [ "4", "false" ] } ] }, { "ch": "How many binary digits (bits) are used to form a BCD word?", "ansGr": [ { "ans": [ "4", "true" ] }, { "ans": [ "8", "false" ] }, { "ans": [ "2", "false" ] } ] }, { "ch": "Which of the following is the binary equivalent of 151", "ansGr": [ { "ans": [ "10010111", "true" ] }, { "ans": [ "11010011", "false" ] }, { "ans": [ "10101101", "false" ] } ] }, { "ch": "Which of the following represents the Binary-Coded Decimal (BCD) for the decimal number 9?", "ansGr": [ { "ans": [ "1001", "true" ] }, { "ans": [ "10001001", "false" ] }, { "ans": [ "11111", "false" ] } ] }, { "ch": "How do you convert a binary number to a decimal number?", "ansGr": [ { "ans": [ "Add the decimal values of the columns that contain a 1", "true" ] }, { "ans": [ "Subtract the binary digits from the decimal system", "false" ] }, { "ans": [ "Multiply each binary digit by 2 and add the results", "false" ] } ] }, { "ch": "What is the BCD representation of the decimal number 264?", "ansGr": [ { "ans": [ "0010 0110 0100", "true" ] }, { "ans": [ "1001 1000 1100", "false" ] }, { "ans": [ "0110 0101 0010", "false" ] } ] }, { "ch": "In the binary numbering system, what do the digits 0 and 1 represent?", "ansGr": [ { "ans": [ "On and off states", "true" ] }, { "ans": [ "Open and closed valves", "false" ] }, { "ans": [ "Positive and negative charges", "false" ] } ] }, { "ch": "In the binary number system, what happens when the digit 1 is exceeded in a place value?", "ansGr": [ { "ans": [ "The place value resets to 0, and a 1 is placed in the next column to the left", "true" ] }, { "ans": [ "The number stays the same", "false" ] }, { "ans": [ "The binary number becomes a decimal number and The digit 2 is used instead of resetting", "false" ] } ] }, { "ch": "Why is the binary system used in computers and digital electronics?", "ansGr": [ { "ans": [ "Because computers use millions of tiny switches that can be ON or OFF", "true" ] }, { "ans": [ "Because binary numbers can be easily converted to decimal", "false" ] }, { "ans": [ "Because it is simpler than the decimal system", "false" ] } ] }, { "ch": "What is the first step when converting a decimal number to a binary number?", "ansGr": [ { "ans": [ "Find the largest binary place value less than or equal to the decimal number", "true" ] }, { "ans": [ "Divide the decimal number by 2 and Add all the binary digits together", "false" ] }, { "ans": [ "Multiply the decimal number by the largest binary digit", "false" ] } ] }, { "ch": "What is the least significant bit (LSB) in a binary number?", "ansGr": [ { "ans": [ "The bit with the smallest weight, on the far right", "true" ] }, { "ans": [ "The bit with the highest value", "false" ] }, { "ans": [ "The bit that alternates every 4 times", "false" ] } ] }, { "ch": "What is the standard operating voltage for Transistor-Transistor Logic (TTL ) circuits?", "ansGr": [ { "ans": [ "+ 5V", "true" ] }, { "ans": [ "+ 12V", "false" ] }, { "ans": [ "+ 9V", "false" ] } ] }, { "ch": "What component is used in digital electronics to construct logic gates?", "ansGr": [ { "ans": [ "Transistors", "true" ] }, { "ans": [ "Capacitors", "false" ] }, { "ans": [ "Resistors", "false" ] } ] }, { "ch": "What does a NOT gate do to its input?", "ansGr": [ { "ans": [ "Inverts the input signal", "true" ] }, { "ans": [ "Outputs the same value", "false" ] }, { "ans": [ "Subtracts 1 from the input", "false" ] } ] }, { "ch": "What must be true for an AND gate to output a Logic 1?", "ansGr": [ { "ans": [ "Both inputs must be Logic 1", "true" ] }, { "ans": [ "At least one input must be Logic 1", "false" ] }, { "ans": [ "Either input must be Logic 0", "false" ] } ] }, { "ch": "What characterizes a linear circuit?", "ansGr": [ { "ans": [ "The output is directly proportional to the input", "true" ] }, { "ans": [ "The circuit contains only nonlinear components", "false" ] }, { "ans": [ "The output is not proportional to the input", "false" ] } ] }, { "ch": "According to Moore's Law, how often is it predicted that the processing speed of integrated circuits will double?", "ansGr": [ { "ans": [ "Every 18 months", "true" ] }, { "ans": [ "Every 24 months", "false" ] }, { "ans": [ "Every 12 months", "false" ] } ] }, { "ch": "What is the primary function of a flip-flop circuit?", "ansGr": [ { "ans": [ "To store a bit of data", "true" ] }, { "ans": [ "To subtract binary numbers", "false" ] }, { "ans": [ "To amplify signals", "false" ] } ] }, { "ch": "What is the typical open-loop gain of a 741 op-amp when operated with a +/-15 volts power", "ansGr": [ { "ans": [ "200", "true" ] }, { "ans": [ "10", "false" ] }, { "ans": [ "50", "false" ] } ] }, { "ch": "In a free-running multivibrator circuit, what determines the frequency of the output square wave?", "ansGr": [ { "ans": [ "The values of the resistors and the capacitor", "true" ] }, { "ans": [ "The type of operational amplifier used", "false" ] }, { "ans": [ "The input voltage levels and the supply voltage", "false" ] } ] }, { "ch": "In a differentiator circuit, where is the capacitor placed relative to the operational amplifier?", "ansGr": [ { "ans": [ "At the input of the amplifier", "true" ] }, { "ans": [ "In parallel with the input resistor", "false" ] }, { "ans": [ "In the feedback loop", "false" ] } ] }, { "ch": "Which type of integrated circuit contains between 100 to 3,000 electronic components?", "ansGr": [ { "ans": [ "Medium-Scale Integration (MSI)", "true" ] }, { "ans": [ "Large-Scale Integration (LSI)", "false" ] }, { "ans": [ "Very-Large-Scale Integration (VLSI)", "false" ] } ] }, { "ch": "In a 3-line to 8-line decoder like the 74138 chip, how many outputs are possible?", "ansGr": [ { "ans": [ "8", "true" ] }, { "ans": [ "16", "false" ] }, { "ans": [ "24", "false" ] } ] }, { "ch": "How does the 74147 encoder differ from a standard encoder?", "ansGr": [ { "ans": [ "It uses a priority scheme for inputs", "true" ] }, { "ans": [ "It only encodes binary numbers", "false" ] }, { "ans": [ "It produces an output signal for all inputs", "false" ] } ] }, { "ch": "What is the key advantage of a JK flip-flop over an RS flip-flop?", "ansGr": [ { "ans": [ "It has no disallowed input combinations", "true" ] }, { "ans": [ "It allows for multiplication of binary numbers", "false" ] }, { "ans": [ "It operates without a clock pulse", "false" ] } ] }, { "ch": "How does an XOR gate differ from an OR gate?", "ansGr": [ { "ans": [ "An XOR gate excludes a Logic 1 output when both inputs are Logic 1", "true" ] }, { "ans": [ "An XOR gate outputs Logic 1 when both inputs are Logic 1", "false" ] }, { "ans": [ "An XOR gate requires only one input for a Logic 1 output", "false" ] } ] }, { "ch": "How many possible input combinations result in a Logic 1 output in an AND gate with two inputs?", "ansGr": [ { "ans": [ "1", "true" ] }, { "ans": [ "None", "false" ] }, { "ans": [ "2", "false" ] } ] }, { "ch": "If the input to a NOT gate is Logic 1 (voltage present), what is the output?", "ansGr": [ { "ans": [ "Logic 0", "true" ] }, { "ans": [ "Same as input", "false" ] }, { "ans": [ "It depends on the circuit", "false" ] } ] }, { "ch": "What is the primary purpose of a logic gate in a digital circuit?", "ansGr": [ { "ans": [ "To manipulate voltage signals based on binary logic", "true" ] }, { "ans": [ "To convert binary numbers to decimal", "false" ] }, { "ans": [ "To amplify signals and store information", "false" ] } ] }, { "ch": "When does an XOR gate output Logic 1?", "ansGr": [ { "ans": [ "When one and only one input is Logic 1", "true" ] }, { "ans": [ "When at least one input is Logic 0", "false" ] }, { "ans": [ "When both inputs are Logic 1", "false" ] } ] }, { "ch": "In an RS flip-flop, what happens when both inputs (R and S) are Logic 1?", "ansGr": [ { "ans": [ "The flip-flop remains in a \"remember\" state", "true" ] }, { "ans": [ "The flip-flop toggles between 1 and 0", "false" ] }, { "ans": [ "The flip-flop outputs Logic 1 on both Q and Q'", "false" ] } ] }, { "ch": "Which components are typically used to build a NOT gate in a circuit?", "ansGr": [ { "ans": [ "Transistors and resistors", "true" ] }, { "ans": [ "Diodes and capacitors", "false" ] }, { "ans": [ "Inductors and resistors", "false" ] } ] }, { "ch": "What is an example of AND logic in an autopilot system?", "ansGr": [ { "ans": [ "The autopilot engages when all necessary conditions are met", "true" ] }, { "ans": [ "The autopilot operates regardless of system conditions", "false" ] }, { "ans": [ "The autopilot engages if any one condition is met", "false" ] } ] }, { "ch": "What is the common thickness of a standard PCB?", "ansGr": [ { "ans": [ "1/16 inch (1.5 mm)", "true" ] }, { "ans": [ "1/8 inch (3 mm)", "false" ] }, { "ans": [ "1/4 inch (6 mm)", "false" ] } ] }, { "ch": "In a single-layer PCB, where are the electronic components mounted?", "ansGr": [ { "ans": [ "On the opposite side of the copper traces", "true" ] }, { "ans": [ "On the same side as the copper traces", "false" ] }, { "ans": [ "Only on the edge of the board", "false" ] } ] }, { "ch": "What is Electrostatic Discharge (ESD)?", "ansGr": [ { "ans": [ "The transfer of electrostatic charges between bodies at different potentials.", "true" ] }, { "ans": [ "The accumulation of electrical energy in a circuit when grounding electronic components.", "false" ] }, { "ans": [ "The insulation of components to prevent electric shock.", "false" ] } ] }, { "ch": "In the PCB manufacturing process, what is used to remove unwanted copper from the board?", "ansGr": [ { "ans": [ "Photo-sensitive chemical process", "true" ] }, { "ans": [ "Laser cutting or High-pressure water jet", "false" ] }, { "ans": [ "Mechanical drilling or High-pressure water jet", "false" ] } ] }, { "ch": "What is a key difference between plated-through holes and non-plated through holes in PCB manufacturing?", "ansGr": [ { "ans": [ "Plated-through holes have copper inside the insulating board material.", "true" ] }, { "ans": [ "Plated-through holes are less expensive to manufacture", "false" ] }, { "ans": [ "Non-plated holes provide better electrical conductivity and more mechanically stable", "false" ] } ] }, { "ch": "Which of the following soldering techniques is commonly used in high-volume manufacturing of double-layered PCBs?", "ansGr": [ { "ans": [ "Flow soldering", "true" ] }, { "ans": [ "Hand soldering with soldering irons", "false" ] }, { "ans": [ "Wave soldering", "false" ] } ] }, { "ch": "How should ESD sensitive components be packaged for transport?", "ansGr": [ { "ans": [ "In an electrostatic shielded conductive bag", "true" ] }, { "ans": [ "in a regular plastic bag and wrapped in a shock-resistant layer", "false" ] }, { "ans": [ "In a cardboard box or a metal container", "false" ] } ] }, { "ch": "What should be connected to the anti-static floor and table-top mats to ensure safety?", "ansGr": [ { "ans": [ "A 1 megaohm resistor connected to ground.", "true" ] }, { "ans": [ "A power supply connected to A light indicator", "false" ] }, { "ans": [ "A voltage meter connected to the anti-static floor and table-top mats", "false" ] } ] }, { "ch": "At what humidity level can a person generate up to 35,000 volts of static electricity by simply walking across a carpet?", "ansGr": [ { "ans": [ "20% relative humidity.", "true" ] }, { "ans": [ "50% relative humidity", "false" ] }, { "ans": [ "80% relative humidity", "false" ] } ] }, { "ch": "What challenge is associated with high-frequency applications in multi-layer PCB designs?", "ansGr": [ { "ans": [ "Unintended capacitive and inductive coupling between layers", "true" ] }, { "ans": [ "Mechanical instability of the board and increased cost of manufacturing", "false" ] }, { "ans": [ "Difficulty in soldering components, so increased cost of manufacturing", "false" ] } ] }, { "ch": "What technology evolved to improve the electrical properties and mechanical stability of PCBs?", "ansGr": [ { "ans": [ "Plated-through hole technology", "true" ] }, { "ans": [ "Through-hole technology", "false" ] }, { "ans": [ "Flexible PCB technology", "false" ] } ] }, { "ch": "What is a via in the context of multi-layer PCBs?", "ansGr": [ { "ans": [ "A conductive path connecting different layers of the PCB.", "true" ] }, { "ans": [ "A hole used for mounting surface-mounted components.", "false" ] }, { "ans": [ "A special type of electronic component used in circuits.", "false" ] } ] }, { "ch": "What is an open-loop system?", "ansGr": [ { "ans": [ "A system that does not have any feedback mechanism.", "true" ] }, { "ans": [ "A system that continuously adjusts its output based on input.", "false" ] }, { "ans": [ "A system that includes a follow-up error detector", "false" ] } ] }, { "ch": "What type of motion does a Rotary Variable Differential Transducer (RVDT) measure?", "ansGr": [ { "ans": [ "Rotational motion", "true" ] }, { "ans": [ "Vertical motion.", "false" ] }, { "ans": [ "Horizontal motion.", "false" ] } ] }, { "ch": "What is a synchro system primarily used for?", "ansGr": [ { "ans": [ "To transmit information from one point to another.", "true" ] }, { "ans": [ "To amplify electrical signals before they are compared to each other.", "false" ] }, { "ans": [ "To store electrical energy used for moving parts", "false" ] } ] }, { "ch": "In a capacitance transmitter, the amount of fuel is determined by:", "ansGr": [ { "ans": [ "The dielectric constant of the material between the plates", "true" ] }, { "ans": [ "The distance between the plates", "false" ] }, { "ans": [ "The length of capacitance transmitter", "false" ] } ] }, { "ch": "In the context of aircraft flight controls, why are open-loop systems not used?", "ansGr": [ { "ans": [ "They do not account for environmental changes that affect performance.", "true" ] }, { "ans": [ "They can achieve the desired control surface settings reliably", "false" ] }, { "ans": [ "They provide a feedback signal to the controller, so they are too complex for flight safety", "false" ] } ] }, { "ch": "What role does the error detector (follow-up) play in a closed-loop system?", "ansGr": [ { "ans": [ "It measures the output and adjusts the input accordingly", "true" ] }, { "ans": [ "It shuts down the system when the output matches the input.", "false" ] }, { "ans": [ "It increases the voltage of input signal to the servomotor", "false" ] } ] }, { "ch": "What characteristic of variable coupling transducers makes them reliable for long-term operation?", "ansGr": [ { "ans": [ "They have only an inductive connection between the primary and secondary coils.", "true" ] }, { "ans": [ "They generate high output voltages on the primary and secondary coils.", "false" ] }, { "ans": [ "They operate based on a direct electrical connection between the primary and secondary coils.", "false" ] } ] }, { "ch": "What distinguishes AC synchro systems from DC synchro systems?", "ansGr": [ { "ans": [ "AC systems use electric induction, while DC systems use resistance current flows.", "true" ] }, { "ans": [ "DC systems require more power than AC systems.", "false" ] }, { "ans": [ "DC systems are more refined than AC systems.", "false" ] } ] }, { "ch": "How does a Torque Differential Transmitter (TDX) operate?", "ansGr": [ { "ans": [ "It accepts two position inputs and outputs their sum.", "true" ] }, { "ans": [ "It compares signals and outputs a lower value.", "false" ] }, { "ans": [ "It compares signals and outputs a higher value.", "false" ] } ] }, { "ch": "How does the position of the I-shaped bar affect the inductance transmitter's output?", "ansGr": [ { "ans": [ "It changes the voltage induced in the secondary coils.", "true" ] }, { "ans": [ "It increases the magnetic field strength in the circuit.", "false" ] }, { "ans": [ "It maintains voltage output lower than a constant value.", "false" ] } ] }, { "ch": "What is the term for the interval where no output is present in a transducer?", "ansGr": [ { "ans": [ "Deadband", "true" ] }, { "ans": [ "Feedback loop", "false" ] }, { "ans": [ "Stability range", "false" ] } ] }, { "ch": "What is one factor that affects the stability of servomechanisms?", "ansGr": [ { "ans": [ "Gear train stiffness", "true" ] }, { "ans": [ "Color of components", "false" ] }, { "ans": [ "Input voltage", "false" ] } ] }, { "ch": "How does a Linear Variable Differential Transducer (LVDT) provide feedback to the controller?", "ansGr": [ { "ans": [ "By changing the voltage induced in two secondary coils as the core moves.", "true" ] }, { "ans": [ "By canceling out induced voltages from two secondary coils as the core moves.", "false" ] }, { "ans": [ "By converting AC signals to DC signals in two secondary coils as the core moves.", "false" ] } ] }, { "ch": "What does a DC selsyn system consist of?", "ansGr": [ { "ans": [ "A transmitter, an indicator, and connecting wires.", "true" ] }, { "ans": [ "A receiver, an amplifier, and a power source.", "false" ] }, { "ans": [ "A control panel, a motor, and a switch", "false" ] } ] }, { "ch": "DC selsyn systems are used in aircraft with:", "ansGr": [ { "ans": [ "Direct current (DC) systems", "true" ] }, { "ans": [ "Alternating current (AC) systems", "false" ] }, { "ans": [ "Pneumatic systems", "false" ] } ] }, { "ch": "What is the relationship between the output signal of an RVDT and the mechanical motion?", "ansGr": [ { "ans": [ "The amplitude of the output signal is proportional to the rotor's angular position.", "true" ] }, { "ans": [ "The amplitude of the output signal is inversely proportional to the rotor's angular position.", "false" ] }, { "ans": [ "The output signal is a constant voltage regardless of motion.", "false" ] } ] }, { "ch": "Which of the following is a common type of synchro system?", "ansGr": [ { "ans": [ "DC Selsyn.", "true" ] }, { "ans": [ "AC Coupling.", "false" ] }, { "ans": [ "Digital Sync.", "false" ] } ] }, { "ch": "What is the purpose of the damping device in a DC selsyn system?", "ansGr": [ { "ans": [ "To prevent overshooting and undershooting.", "true" ] }, { "ans": [ "To enhance the magnetic field strength", "false" ] }, { "ans": [ "To provide additional voltage to the system.", "false" ] } ] }, { "ch": "What do the outputs from the stator windings in a resolver represent?", "ansGr": [ { "ans": [ "Sine and cosine functions", "true" ] }, { "ans": [ "Mechanical torque values", "false" ] }, { "ans": [ "Direct current voltage", "false" ] } ] }, { "ch": "Which factors determine the amount of electricity a capacitor can store?", "ansGr": [ { "ans": [ "Plate area, distance between plates, and dielectric constant", "true" ] }, { "ans": [ "Plate material, length, and width and the resistance", "false" ] }, { "ans": [ "Temperature, pressure, and voltage", "false" ] } ] }, { "ch": "What common manufacturing defect can significantly distort the flux distribution in synchros?", "ansGr": [ { "ans": [ "Air gap inaccuracies", "true" ] }, { "ans": [ "Electrical insulation", "false" ] }, { "ans": [ "Winding length", "false" ] } ] }, { "ch": "Which design limitation in synchros causes deviations in the magnetic flux wave?", "ansGr": [ { "ans": [ "Winding distribution", "true" ] }, { "ans": [ "Motor speed", "false" ] }, { "ans": [ "Gear material", "false" ] } ] }, { "ch": "What happens when a null is not detected by the control transformer?", "ansGr": [ { "ans": [ "An error signal is sent to a servo amplifier.", "true" ] }, { "ans": [ "The system shuts down completely.", "false" ] }, { "ans": [ "The indicator becomes unresponsive", "false" ] } ] }, { "ch": "What shapes characterize the laminated core of an inductance transmitter?", "ansGr": [ { "ans": [ "Capital letter \"E\" and \"I\"", "true" ] }, { "ans": [ "Hexagonal and octagonal", "false" ] }, { "ans": [ "Square and rectangular", "false" ] } ] }, { "ch": "Which type of servomechanism includes a feedback system?", "ansGr": [ { "ans": [ "Closed-loop servomechanism", "true" ] }, { "ans": [ "Open-loop servomechanism", "false" ] }, { "ans": [ "Timer-based control system", "false" ] } ] }, { "ch": "In a closed-loop system, what is the purpose of the error detector?", "ansGr": [ { "ans": [ "To calculate the difference between desired input and actual output", "true" ] }, { "ans": [ "To amplify the actual output signal", "false" ] }, { "ans": [ "To reduce the difference between desired input and actual output to zero", "false" ] } ] }, { "ch": "What type of motion does anRotary Variable Differential Transformer (RVDT) measure?", "ansGr": [ { "ans": [ "Angular motion", "true" ] }, { "ans": [ "Linear motion", "false" ] }, { "ans": [ "Vibration", "false" ] } ] }, { "ch": "How does an RVDT generate an output signal?", "ansGr": [ { "ans": [ "Through the motion of a rotor inside the electromagnetic field of the stator", "true" ] }, { "ans": [ "By converting DC to AC through a rectifier", "false" ] }, { "ans": [ "By varying resistance in a potentiometer", "false" ] } ] }, { "ch": "What type of signal is applied to the primary coil of an RVDT?", "ansGr": [ { "ans": [ "AC voltage", "true" ] }, { "ans": [ "DC voltage", "false" ] }, { "ans": [ "Pulsed DC", "false" ] } ] }, { "ch": "What is the basic purpose of a synchro system in aircraft?", "ansGr": [ { "ans": [ "Used in remote analog position-indicating instruments", "true" ] }, { "ans": [ "Used to switch between AC and DC power", "false" ] }, { "ans": [ "Used to measure voltage fluctuations", "false" ] } ] }, { "ch": "How do AC synchros function?", "ansGr": [ { "ans": [ "As rotary transformers", "true" ] }, { "ans": [ "As voltage regulators", "false" ] }, { "ans": [ "As variable resistors", "false" ] } ] } ]