2A672 Volume 1 Quiz

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  • 1/60 Questions

    What is the simplest form of matter?

    • Element
    • Mixture
    • Electrons
    • Compound
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About This Quiz

This quiz, titled '2a672 volume 1', assesses foundational knowledge in physics, focusing on atomic structure, electron behavior, and electrical principles. It evaluates understanding of elements, valence electrons, insulators, ion fields, resistance factors, and circuit calculations, crucial for learners in physics and electrical engineering.

Electrical Principles Quizzes & Trivia

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  • 2. 

    In an atom, what electrons contain the most energy?

    • The energy is shared equally by all electrons

    • Orbiting electrons

    • Valence electrons

    • K shell electrons

    Correct Answer
    A. Valence electrons
    Explanation
    Valence electrons are the electrons in the outermost shell of an atom. These electrons are involved in chemical reactions and are responsible for the atom's ability to form bonds with other atoms. Since valence electrons are farther from the nucleus compared to other electrons, they experience less attraction from the positive charge of the nucleus. This results in valence electrons having higher energy levels compared to electrons in inner shells. Therefore, valence electrons contain the most energy in an atom.

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  • 3. 

    Voltage induced into a conductor by the expanding and collapsing of a magnetic field is

    • Magnetism

    • Reluctance

    • Direct current

    • Electromagnetic induction

    Correct Answer
    A. Electromagnetic induction
    Explanation
    Electromagnetic induction is the correct answer because when a magnetic field expands or collapses, it creates a change in magnetic flux through a conductor. This change in magnetic flux induces a voltage in the conductor according to Faraday's law of electromagnetic induction. This phenomenon is the basis for the generation of electric power in generators and is a fundamental principle in electromagnetism.

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  • 4. 

    If the size of the plates of a capacitor is increased, how is capacitance affected?

    • Capacitance increases

    • Capacitance decreases

    • Electrons are distorted and scattered

    • Electrostatic force between the plates decreases

    Correct Answer
    A. Capacitance increases
    Explanation
    When the size of the plates of a capacitor is increased, the capacitance increases. This is because capacitance is directly proportional to the area of the plates. As the size of the plates increases, there is more surface area available for the electric field to store charge, resulting in an increase in capacitance.

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  • 5. 

    What are factors that affect the resistance of a material?

    • Area, weight, and state of material

    • Area, temperature, and type of material

    • Temperature, weight, and state of material

    • Temperature, type of material, and state of material

    Correct Answer
    A. Area, temperature, and type of material
    Explanation
    The factors that affect the resistance of a material are the area, temperature, and type of material. The area of the material affects resistance because a larger area allows for more current to flow, resulting in lower resistance. The temperature of the material affects resistance because as the temperature increases, the resistance also increases. The type of material affects resistance because different materials have different resistivities, which determine how easily they allow current to flow.

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  • 6. 

    What is the difference between and open and a short?

    • An open causes resistance to decrease; a short causes resistance to increase

    • Excessive current flow in an open circuit; no current flow in a shorted component

    • No current flow in an open circuit; excessive current flow in a shorted component

    • Minimum voltage development across the open component; maximum voltage development across the shorted component

    Correct Answer
    A. No current flow in an open circuit; excessive current flow in a shorted component
    Explanation
    In an open circuit, there is no complete path for the current to flow, resulting in no current flow. On the other hand, in a short circuit, there is a direct connection between two points with very low resistance, causing excessive current flow. Therefore, the correct answer is "No current flow in an open circuit; excessive current flow in a shorted component."

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  • 7. 

    What is the primary use of a silicon-controlled rectifier (SCR)?

    • Electronic switch

    • Voltage regulator

    • Circuit amplifier

    • Spike protector

    Correct Answer
    A. Electronic switch
    Explanation
    A silicon-controlled rectifier (SCR) is primarily used as an electronic switch. It is a semiconductor device that can control the flow of electric current. When a small control current is applied to the gate terminal, the SCR allows a larger current to flow from the anode to the cathode. This makes it useful for applications where precise control of high-power AC or DC currents is required, such as in motor control, power supplies, and lighting systems. The SCR can turn on and off rapidly, making it an efficient and reliable electronic switch.

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  • 8. 

    What action occurs when the B809A generator set AC card senses an AC supply fault?

    • Only generator output stops

    • Only the AC contactor opens

    • AC supply warning light illuminates

    • AC contactor opens and generator output stops

    Correct Answer
    A. AC contactor opens and generator output stops
    Explanation
    When the B809A generator set AC card senses an AC supply fault, the AC contactor opens and the generator output stops. This means that the AC contactor, which is responsible for controlling the flow of electricity to the generator, opens or disconnects the circuit. As a result, the generator stops producing electrical output. This action is taken to protect the system from any potential damage or danger caused by the AC supply fault.

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  • 9. 

    What component of the -60A lubrication system on a gas turbine engine draws excess oil from the gear case?

    • Oil cooler

    • Main oil pump

    • Scavenge pump

    • Oil jet assembly

    Correct Answer
    A. Scavenge pump
    Explanation
    The scavenge pump is responsible for drawing excess oil from the gear case in the -60A lubrication system on a gas turbine engine. This pump is designed to remove any oil that is not needed for lubrication and return it to the oil tank or cooler. By doing so, the scavenge pump helps to maintain the proper oil levels and prevent any potential damage or malfunction caused by an excessive amount of oil in the gear case.

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  • 10. 

    In an inductor, what happens to the magnetic lines of force if the diameter of the core is increased in size?

    • Permeability increases

    • Magnetic field decreases

    • Induction of the coil increases

    • Induction of the coil decreases

    Correct Answer
    A. Induction of the coil increases
    Explanation
    When the diameter of the core in an inductor is increased in size, it allows for more magnetic lines of force to pass through the coil. This increase in magnetic lines of force leads to a higher level of induction of the coil.

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  • 11. 

    What gas turbine engine component is specifically designed to break if the engine locks up?

    • Second stage impeller

    • First stage diffuser

    • Compressor shaft

    • Torsion shaft

    Correct Answer
    A. Torsion shaft
    Explanation
    The torsion shaft is specifically designed to break if the gas turbine engine locks up. This component is designed to absorb and dampen torsional vibrations in the engine. If the engine locks up, excessive torsional forces can be exerted on the shaft, causing it to break and prevent further damage to the engine.

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  • 12. 

    Atoms having more than four electrons, but less than eight are known as

    • Insulators

    • Conductors

    • Stable atoms

    • Semiconductors

    Correct Answer
    A. Insulators
    Explanation
    Atoms having more than four electrons, but less than eight are known as insulators. Insulators are materials that do not conduct electricity easily because their outermost electron shells are fully occupied or nearly fully occupied. This means that they have a stable electron configuration and do not readily gain or lose electrons to become charged ions. As a result, insulators have high resistivity and do not allow the flow of electric current easily.

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  • 13. 

    What is the major difference between an NPN transistor and a PNP transistor?

    • A PNP transistor can only be used as a regulator

    • An NPN transistor can only be used as a switch

    • Direction of current flow

    • Number of junctions

    Correct Answer
    A. Direction of current flow
    Explanation
    The major difference between an NPN transistor and a PNP transistor is the direction of current flow. In an NPN transistor, the current flows from the collector to the emitter, while in a PNP transistor, the current flows from the emitter to the collector. This difference in current flow direction is due to the arrangement and doping of the semiconductor materials within the transistor.

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  • 14. 

    What component on the B809A generator set fuel system distributes and delivers an accurate amount of fuel to the engine cylinders?

    • Injector pump

    • Transfer pump

    • Injector nozzles

    • Throttle actuator

    Correct Answer
    A. Injector pump
    Explanation
    The injector pump is the component on the B809A generator set fuel system that distributes and delivers an accurate amount of fuel to the engine cylinders. It is responsible for pressurizing the fuel and injecting it into the cylinders at the correct time and in the correct quantity to ensure efficient combustion. The injector pump plays a crucial role in maintaining the engine's performance and fuel efficiency.

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  • 15. 

    The electrostatic fields around a positive ion move

    • Inward

    • Outward

    • Inward, then outward

    • Outward, then inward

    Correct Answer
    A. Outward
    Explanation
    The electrostatic fields around a positive ion move outward. This is because positive ions have a deficiency of electrons, resulting in an excess of positive charge. As a result, the positive charge is repelled and moves away from the ion, creating an outward flow of the electrostatic fields.

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  • 16. 

    What B809A generator set engine safety circuit incorporates a seven-second time delay before activation?

    • Low fuel fault

    • Overspeed fault

    • Low lube pressure

    • Coolant temperature

    Correct Answer
    A. Low lube pressure
    Explanation
    The correct answer is low lube pressure. The B809A generator set engine safety circuit incorporates a seven-second time delay before activation in order to prevent false alarms or unnecessary shutdowns. This delay allows the engine to stabilize and ensures that the low lube pressure condition is consistent before triggering the safety circuit. By incorporating this time delay, the engine is protected from potential damage or failure caused by insufficient lubrication.

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  • 17. 

    Convert 500 milliamps to standard amperage.

    • .005 amps

    • .05 amps

    • .5 amps

    • 50 amps

    Correct Answer
    A. .5 amps
    Explanation
    To convert milliamps to standard amperage, you divide the value by 1000. In this case, 500 milliamps divided by 1000 equals 0.5 amps.

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  • 18. 

    In a series-parallel circuit, the series current at I1 = 9 amps; in the two parallel branches, I2 = 5 amps; and the value of I3 is not listed.  Use Ohms's law to find the value of I3 and IT.

    • I3 = 5 amps and IT = 14 amps

    • I3 = 4 amps and IT = 9 amps

    • I3 = 4 amps and IT =18 amps

    • Not enough information to solve

    Correct Answer
    A. I3 = 4 amps and IT = 9 amps
    Explanation
    Total current is equal throughout series part of circuit. So since I1 (in series part) = 9 amps, IT = 9 amps. Parallel branches always add up to equal current flow in series part. So, I2 (5 amps) + I3 (?) = 9 amps. I3 has to equal 4 amps.

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  • 19. 

    What type of transformer contains more turns in the primary winding than in the secondary winding?

    • Current

    • Step up

    • Rectifier

    • Step down

    Correct Answer
    A. Step down
    Explanation
    A step-down transformer contains more turns in the primary winding than in the secondary winding. This type of transformer is designed to reduce the voltage level from the primary side to the secondary side. By having more turns in the primary winding, the transformer increases the voltage on the primary side and decreases it on the secondary side, resulting in a step-down effect. This is commonly used in power distribution systems to lower the high voltage from power plants to a safer and more usable level for homes and businesses.

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  • 20. 

    The portion of the voltage regulator that supplies exciter field voltage is transformer

    • (T1) and rectifier (B3)

    • (T3) and rectifier (B2)

    • (T2) and rectifier (B1)

    • (T1) and rectifier (CR26)

    Correct Answer
    A. (T1) and rectifier (CR26)
    Explanation
    The correct answer is (T1) and rectifier (CR26). In a voltage regulator, the exciter field voltage is supplied by a transformer (T1) and a rectifier (CR26). The transformer steps down the voltage from the main generator and the rectifier converts the AC voltage into DC voltage. This combination of T1 and CR26 ensures that the exciter field receives the appropriate voltage to regulate the output voltage of the generator.

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  • 21. 

    During the operation of a -60A, you notice the exhaust gas temperature is excessively high.  What is the probable cause of this trouble?

    • Air oil seals

    • Fuel atomizer

    • Torus assembly

    • Pneumatic thermostat

    Correct Answer
    A. Pneumatic thermostat
    Explanation
    The probable cause of the excessively high exhaust gas temperature in a -60A could be a malfunctioning pneumatic thermostat. The pneumatic thermostat is responsible for regulating the temperature of the engine by controlling the flow of air and fuel. If it is not functioning properly, it may cause an imbalance in the air-fuel mixture, leading to higher exhaust gas temperatures.

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  • 22. 

    A -86D is operating and the alternating current (AC) voltmeter is reading 200 volts alternating current (VAC) on all three phases.  What do you do?

    • Adjust VR1

    • Adjust R61

    • Adjust VR1 or R61

    • Switch S15 to the L-N position

    Correct Answer
    A. Switch S15 to the L-N position
  • 23. 

    What is the resistance in a circuit if the power rating is 40 watts and total current is 2 amps?

    • 40 ohms

    • 20 ohms

    • 10 ohms

    • 0.5 ohms

    Correct Answer
    A. 10 ohms
    Explanation
    40/2^2 = 40/4 = 10 ohms

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  • 24. 

    In a series-parallel circuit, find RT if series resistor R1 = 7 ohms, and parallel resistors R2 and R3 = 8 ohms.

    • 23 ohms

    • 15 ohms

    • 11 ohms

    • 8 ohms

    Correct Answer
    A. 11 ohms
    Explanation
    Find RT of parallel resistors: RT = 8x8/8+8 = 64/16 = 4
    New R2 is RT of parallel resistors. Now use RT = R1 (7) + R2 (4) = 11 ohms

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  • 25. 

    What is the basic principle of operation for transformers?

    • Mutual induction

    • Magnetic induction

    • Counterelectromotive force

    • Primary and secondary induction

    Correct Answer
    A. Mutual induction
    Explanation
    Mutual induction is the basic principle of operation for transformers. This principle states that when the current in the primary coil of a transformer changes, it creates a changing magnetic field. This changing magnetic field induces a voltage in the secondary coil, which can then be used to transfer electrical energy from one circuit to another. Mutual induction allows transformers to efficiently increase or decrease the voltage of an alternating current while maintaining power conservation.

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  • 26. 

    The emitter in a unijunction transister always points toward the

    • Base 1 lead

    • Collector

    • Emitter

    • Gate

    Correct Answer
    A. Base 1 lead
    Explanation
    The emitter in a unijunction transistor always points toward the base 1 lead. This is because the base 1 lead is the terminal that controls the current flow through the transistor. By pointing the emitter towards the base 1 lead, the transistor is able to regulate the current effectively. The emitter is responsible for emitting the majority charge carriers, and by aligning it with the base 1 lead, the transistor can function properly and perform its intended tasks.

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  • 27. 

    What condition is sensed by the DC card on the B809A generator set?

    • Overtemperature

    • Under frequency

    • Overfrequency

    • Low fuel

    Correct Answer
    A. Overtemperature
    Explanation
    The DC card on the B809A generator set senses the condition of overtemperature. This means that the card is able to detect when the temperature of the generator set exceeds a certain threshold. This is an important feature as it helps prevent overheating and potential damage to the generator set. By sensing overtemperature, the DC card can trigger appropriate actions such as shutting down the generator set or activating cooling mechanisms to ensure safe and efficient operation.

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  • 28. 

    If a small potential is applied to the gate of a silicon-controlled rectifier (SCR), the

    • Middle junction of the SCR is reversed biased and the SCR turns off

    • Middle junction of the SCR is forward biased and the SCR turns on

    • Depletion region increases in size and blocks current flow

    • Depletion region decreases in size and stops current flow

    Correct Answer
    A. Middle junction of the SCR is forward biased and the SCR turns on
    Explanation
    When a small potential is applied to the gate of an SCR, it causes the middle junction of the SCR to become forward biased. This means that the voltage at the gate is higher than the voltage at the cathode, allowing current to flow through the SCR and turning it on.

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  • 29. 

    How many electrons does the valance band of an intrinsic semiconductor have?

    • 3

    • 4

    • 5

    • 6

    Correct Answer
    A. 4
    Explanation
    The valence band of an intrinsic semiconductor has 4 electrons. In an intrinsic semiconductor, the valence band is completely filled with electrons at absolute zero temperature. Each electron in the valence band is bonded to its respective atom's nucleus, creating a stable lattice structure. These valence electrons are responsible for the semiconductor's electrical conductivity.

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  • 30. 

    How is a zener diode connected in a circuit to regulate voltage?

    • In parallel to the load

    • In series with the load

    • In parallel to the resistor

    • In series with the resistor

    Correct Answer
    A. In parallel to the load
    Explanation
    A zener diode is connected in parallel to the load in order to regulate voltage. When connected in this manner, the zener diode acts as a voltage regulator by maintaining a constant voltage across the load, regardless of variations in the input voltage. This is achieved by allowing current to flow through the zener diode in the reverse direction when the voltage exceeds the zener breakdown voltage. This ensures that the voltage across the load remains constant, providing a stable power supply for the circuit.

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  • 31. 

    What are the three leads in a unijunction transistor (UJT) called?

    • Anode, cathose, and gate

    • Emitter, base 1, and base 2

    • Emitter, collector, and base

    • Common emitter, common collector, and common base

    Correct Answer
    A. Emitter, base 1, and base 2
    Explanation
    The three leads in a unijunction transistor (UJT) are called emitter, base 1, and base 2.

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  • 32. 

    If the arrow in a bipolar transistor is pointing away from the base, what type of transister is it?

    • N-type

    • P-type

    • NPN

    • PNP

    Correct Answer
    A. NPN
    Explanation
    If the arrow in a bipolar transistor is pointing away from the base, it indicates that the transistor is an NPN type. In an NPN transistor, the majority charge carriers are negative electrons, hence the arrow pointing away from the base represents the flow of electrons from the emitter to the base and then to the collector.

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  • 33. 

    What component controls the strength of the -86D exciter field L2?

    • Excitation relay K16

    • Time delay relay K14

    • Voltage regulator VR1

    • Automatic manual switch S1

    Correct Answer
    A. Voltage regulator VR1
    Explanation
    The voltage regulator VR1 controls the strength of the -86D exciter field L2. This means that it regulates the voltage supplied to the exciter field, which in turn determines the strength of the field. By adjusting the voltage, the voltage regulator can control the output of the exciter field and ensure that it is at the desired level.

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  • 34. 

    While operating a -86D at governed speed, you place S13 in the build up position and the undervoltage light comes on.  What is the probable cause of this trouble?

    • Voltage regulator

    • Plug interlock relay

    • Memory time delay relay

    • Overvoltage/undervoltage relay

    Correct Answer
    A. Memory time delay relay
    Explanation
    The probable cause of the undervoltage light coming on when placing S13 in the build up position while operating a -86D at governed speed is the memory time delay relay.

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  • 35. 

    In a circuit using a bridge rectifier, how many diodes are forward biased during the first cycle of alternating current (AC)?

    • 4

    • 3

    • 2

    • 1

    Correct Answer
    A. 2
    Explanation
    During the first cycle of alternating current (AC) in a circuit using a bridge rectifier, two diodes are forward biased. A bridge rectifier consists of four diodes arranged in a bridge configuration. During the positive half cycle of the AC input, two diodes (D1 and D2) become forward biased and conduct current, while the other two diodes (D3 and D4) are reverse biased and do not conduct. This allows the positive half cycle of the AC input to pass through the circuit. Therefore, the correct answer is 2.

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  • 36. 

    Apparent power is measured in

    • Kilovolts (KV)

    • Kilowatts (KW)

    • Kilo-volt-amperes (KVA)

    • Kilo-watt-amperes (KWA)

    Correct Answer
    A. Kilo-volt-amperes (KVA)
    Explanation
    Apparent power is a measure of the total power in an electrical circuit, including both the real power (measured in kilowatts) and the reactive power. It is expressed in kilo-volt-amperes (KVA) because it represents the product of the voltage (measured in kilovolts) and the current (measured in amperes) in the circuit. This unit is used to quantify the total power that is being supplied or consumed by a device or system, taking into account both the real and reactive components of power.

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  • 37. 

    What are the minority carriers in P-type material?

    • Holes

    • Protons

    • Neutrons

    • Electrons

    Correct Answer
    A. Electrons
    Explanation
    In P-type material, the majority carriers are holes, which are positively charged. Minority carriers, on the other hand, are the minority of charge carriers in the material. In P-type material, the minority carriers are electrons, which are negatively charged. These electrons are present due to the doping of the material with impurities, which introduces extra electrons into the crystal lattice.

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  • 38. 

    While performing an ops check of the -60A, you notice the unit is only operating at 97 percent.  What is the probable cause of this trouble?

    • 110 percent centrifugal switch

    • Fuel pump and control unit

    • Acceleration limiter valve

    • Governor trim control

    Correct Answer
    A. Governor trim control
    Explanation
    The probable cause of the unit operating at only 97 percent is the governor trim control. The governor trim control is responsible for adjusting the fuel flow to maintain the desired speed of the unit. If the governor trim control is not functioning properly, it may not be able to adjust the fuel flow accurately, resulting in the unit operating at a lower percentage than desired.

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  • 39. 

    The area of a semiconductor where P-type material is joined to N-type material is known as

    • Dielectric region

    • Depletion region

    • Depletion field

    • PN region

    Correct Answer
    A. Depletion region
    Explanation
    The area where P-type material is joined to N-type material in a semiconductor is known as the depletion region. This region is depleted of majority carriers due to the diffusion of minority carriers from both sides, creating a region with no free charge carriers. The depletion region acts as a barrier to the flow of current and plays a crucial role in the operation of semiconductor devices such as diodes and transistors.

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  • 40. 

    What happens if the emitter-base (E-B) current is increased in a transistor amplifier?

    • Resitance decreases and current through the load circuit decreases

    • Current decreases through the emitter-collector (E-C) circuit

    • Resistance increases and current flow decreases

    • Current increases through the E-C circuit

    Correct Answer
    A. Current increases through the E-C circuit
    Explanation
    If the emitter-base current is increased in a transistor amplifier, it will cause the current to increase through the emitter-collector (E-C) circuit. This is because the emitter-base junction acts as a current amplifier, and an increase in the input current will result in a proportional increase in the output current through the E-C circuit.

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  • 41. 

    How many junctions are in a unijunction transister (UJT)?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 1
    Explanation
    A unijunction transistor (UJT) typically has only one junction. This junction is formed between the emitter and the base regions of the transistor. The UJT operates by controlling the current flow between the emitter and the base junction, which in turn controls the current flow between the emitter and the collector terminals. Therefore, the correct answer is 1, as there is only one junction in a UJT.

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  • 42. 

    You are driving on the flight line and notice a -86D power unit with all the fault lights on.  You try to reset S23, but the lights stay on.  What is a probable cause of this trouble?

    • S30 is shorted

    • S23 is stuck open

    • K17 contacts are closed

    • K23 contacts are open

    Correct Answer
    A. S30 is shorted
    Explanation
    If the -86D power unit has all the fault lights on and resetting S23 does not fix the issue, a probable cause of this trouble could be that S30 is shorted. A shorted S30 would prevent the fault lights from turning off even after attempting to reset S23.

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  • 43. 

    Use the power factor meter on a -8 load bank

    • During resistive load tets

    • When measuring true power

    • When measuring apparent power

    • During performing resistive and reactive load tests simultaneously

    Correct Answer
    A. During performing resistive and reactive load tests simultaneously
    Explanation
    The power factor meter is used during performing resistive and reactive load tests simultaneously. This is because resistive load tests only measure true power, while reactive load tests measure both true power and apparent power. Therefore, using a power factor meter allows for accurate measurement of both types of power during these tests.

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  • 44. 

    A junction diode has how many PN junction(s)?

    • 1

    • 2

    • 3

    • 4

    Correct Answer
    A. 1
    Explanation
    A junction diode has only one PN junction. A PN junction is formed by the combination of a P-type semiconductor and an N-type semiconductor, creating a boundary between the two regions. This junction is responsible for the diode's characteristic behavior, allowing current to flow in one direction while blocking it in the opposite direction. Therefore, a junction diode has one PN junction.

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  • 45. 

    What statement best describes a capacitive circuit?

    • Current leads applied voltage by 90 degrees

    • Applied voltage leads current by 90 degrees

    • Has the ability to conduct in one direction and not in the other

    • Has the ability to conduct in all directions when gated or discharged

    Correct Answer
    A. Current leads applied voltage by 90 degrees
    Explanation
    A capacitive circuit is characterized by the fact that the current leads the applied voltage by 90 degrees. This means that the current reaches its maximum value before the voltage does, and the phase angle between the current and voltage is 90 degrees. This behavior is typical of capacitors, which store and release energy in response to changes in voltage.

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  • 46. 

    What is the operating voltage of the blower motor and control relays on a -8 load bank?

    • 12 VDC

    • 28 VDC

    • 120 VAC

    • 208 VAC

    Correct Answer
    A. 28 VDC
    Explanation
    The operating voltage of the blower motor and control relays on a -8 load bank is 28 VDC.

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  • 47. 

    If a schematic diagram doesn't list a reference for the zener diode, the diode is probably being used as a

    • Reference

    • Normal diode

    • Spike protector

    • Voltage regulator

    Correct Answer
    A. Spike protector
    Explanation
    If a schematic diagram doesn't list a reference for the zener diode, it is likely being used as a spike protector. A spike protector is a device that protects electronic circuits from voltage spikes or surges. Zener diodes are commonly used in spike protection circuits because they have a breakdown voltage that allows them to conduct when the voltage exceeds a certain threshold. By diverting excessive voltage away from the circuit, the zener diode helps to protect the components from damage. Therefore, if a schematic diagram doesn't specify the purpose of the zener diode, it is reasonable to assume that it is being used as a spike protector.

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  • 48. 

    In what position must the line drop switch be placed when adjustments are made to a voltage regulator?

    • ON

    • OFF

    • Adjust

    • Regulator

    Correct Answer
    A. ON
    Explanation
    The line drop switch must be placed in the ON position when adjustments are made to a voltage regulator. This is because the ON position allows the flow of electricity through the regulator, enabling adjustments to be made to the voltage output. Placing the switch in the OFF position would interrupt the flow of electricity and prevent any adjustments from being made. The Adjust and Regulator options are not relevant to the position of the line drop switch.

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  • 49. 

    How is the zener diode connected in a circuit to protect the load?

    • In parallel to the resistor

    • In series with the load

    • In parallel to the load

    • Forward biased

    Correct Answer
    A. In parallel to the load
    Explanation
    The zener diode is connected in parallel to the load in order to protect it. When the voltage across the load exceeds the breakdown voltage of the zener diode, it starts conducting in reverse bias and limits the voltage across the load. This prevents the load from being damaged by excessive voltage.

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  • Dec 13, 2013
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