2A672 Code 6 Volume 1 UREs Complete

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  • 1/88 Questions

    When troubleshooting any electrical system, you can locate a starting point by first finding the

    • Common ground bus
    • Main circuit breaker
    • External power source
    • Last known source of power
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About This Quiz

Code 6 UREs volume 1 is a quiz testing your knowledge on different concepts in Physics. The topics tested vary from atomic structure, energy just to mention but a few. Take it up and see how good you are.

Physics Quizzes & Trivia

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  • 2. 

    If there are 8 electrons in the outer most shell of an atom, then it is considered

    • Complete

    • Unstable

    • Charged

    • Stable

    Correct Answer
    A. Stable
    Explanation
    If an atom has 8 electrons in its outermost shell, it is considered stable. This is because the outermost shell, also known as the valence shell, is considered complete when it has 8 electrons. This configuration is known as the octet rule, which states that atoms tend to gain, lose, or share electrons in order to achieve a stable configuration with 8 electrons in the valence shell. Therefore, having 8 electrons in the outermost shell indicates stability.

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  • 3. 

    When voltage is induced into a conductor by a relative motion between the conductor and a magnetic field this principle is known as

    • Magnetism

    • Reluctance

    • Direct current

    • Electromagnetic induction

    Correct Answer
    A. Electromagnetic induction
    Explanation
    Electromagnetic induction is the principle where voltage is induced into a conductor due to the relative motion between the conductor and a magnetic field. This phenomenon was discovered by Michael Faraday in the early 19th century and is the basis for the working of many electrical devices such as generators and transformers. It is an essential concept in electromagnetism and plays a crucial role in the generation and transmission of electric power.

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  • 4. 

    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 responsible for transmitting torque from the engine's compressor to the turbine. If the engine locks up, excessive torque can be generated, causing the torsion shaft to break and prevent further damage to the engine.

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  • 5. 

    What component on an A/M32A-86D generator is used to manually increase output voltage?

    • Voltage rheostat R61

    • Excitation relay K16

    • Test bank switch S202

    • Auto/Manual switch S1

    Correct Answer
    A. Voltage rheostat R61
    Explanation
    The voltage rheostat R61 is used to manually increase the output voltage on an A/M32A-86D generator. This component allows the user to adjust the resistance in the circuit, which in turn affects the output voltage. By increasing the resistance, the voltage can be increased. Therefore, the voltage rheostat R61 is the correct answer to the question.

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  • 6. 

    If you have a loss of residual magnetism in the exciter field poles, what should you do?

    • Connect TB4-11 to 14 VDC power source

    • Check the Field Transformer

    • Field flash the generator

    • Check the fault display

    Correct Answer
    A. Field flash the generator
    Explanation
    If there is a loss of residual magnetism in the exciter field poles, the appropriate action to take is to field flash the generator. Field flashing involves applying a temporary voltage to the field windings to restore the residual magnetism. This can be done by connecting TB4-11 to a 14 VDC power source. By doing so, the magnetic field in the generator is reestablished, allowing it to produce electricity.

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  • 7. 

    What is the simplest form of matter?

    • Element

    • Mixture

    • Electrons

    • Compound

    Correct Answer
    A. Element
    Explanation
    An element is the simplest form of matter because it consists of only one type of atom. Atoms are the basic building blocks of matter, and each element has its own unique set of properties. Mixtures, compounds, and electrons are not the simplest form of matter because they involve the combination of multiple elements or subatomic particles.

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  • 8. 

    In an atom, what electrons contain the most energy?

    • The energy is shared equal by all electrons

    • Orbiting electrons

    • Valance electrons

    • K shell electrons

    Correct Answer
    A. Valance electrons
    Explanation
    Valance electrons contain the most energy in an atom. These are the electrons in the outermost energy level or shell of an atom. Valence electrons are involved in chemical bonding and are more easily lost or gained during chemical reactions, which requires energy. Therefore, they have the highest energy compared to the other electrons in the atom.

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  • 9. 

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

    • Capacitance increases

    • Capacitance decreases

    • Electrons 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 distance between the plates decreases. Capacitance is directly proportional to the area of the plates and inversely proportional to the distance between them. Therefore, when the size of the plates is increased, the area of the plates increases, resulting in an increase in capacitance.

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  • 10. 

    What action occurs when the B809A generator set alternating current (AC) card senses an AC 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 alternating current (AC) card senses an AC fault, the AC contactor opens and the generator output stops. This means that the electrical connection between the generator and the load is interrupted, preventing any further supply of AC power. This action is taken to protect the system from further damage and to prevent any potential hazards that may arise from the AC fault.

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  • 11. 

    What statement best describes a diode

    • Is a five-terminal device

    • Is a three-terminal device

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

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

    Correct Answer
    A. Has the ability to conduct in one direction and not the other
    Explanation
    A diode is a two-terminal device that allows current to flow in one direction and blocks it in the opposite direction. This characteristic is known as its ability to conduct in one direction and not the other.

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  • 12. 

    During operation of a A/M32A-60A generator set, you noticed the exhaust gas temperature is excessively high.  What is a probable cause of this trouble?

    • Air oil seals

    • Fuel atomizer

    • Torus assembly

    • Pneumatic thermostat

    Correct Answer
    A. Pneumatic thermostat
    Explanation
    A probable cause of the excessively high exhaust gas temperature in the A/M32A-60A generator set could be a malfunctioning pneumatic thermostat. The pneumatic thermostat is responsible for regulating the temperature of the exhaust gas, and if it is not functioning properly, it may fail to control the temperature effectively, resulting in the high temperature. This can be a potential issue that needs to be addressed to prevent any further damage to the generator set.

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  • 13. 

    What is the difference between an 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
    An open circuit refers to a break or disconnect in the circuit, which prevents the flow of current. As a result, there is no current flow in an open circuit. On the other hand, a short circuit occurs when there is an unintended connection or low resistance path in the circuit. This causes excessive current flow through the shorted component. Therefore, the correct answer states that there is no current flow in an open circuit, while there is excessive current flow in a shorted component.

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  • 14. 

    What B809A generator set speed control system component produces frequency pulse train for engine speed reference?

    • Magnetic pick-up

    • Engine speed governor

    • Speed trim potentiometer

    • Speed control potentiometer

    Correct Answer
    A. Magnetic pick-up
    Explanation
    The magnetic pick-up is the component of the B809A generator set speed control system that produces a frequency pulse train for the engine speed reference. This means that it generates electrical signals that correspond to the speed of the engine, which is used to control and maintain the desired speed of the generator set.

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  • 15. 

    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 its area, temperature, and type of material. The area of the material affects resistance because a larger area allows for more current flow and therefore less resistance. Temperature affects resistance because as temperature increases, the resistance of the material also increases. The type of material affects resistance because different materials have different resistivities, which determine their ability to conduct electricity.

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  • 16. 

    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 fundamental difference in current flow direction is what distinguishes these two types of transistors and determines their specific applications and behaviors.

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  • 17. 

    During operation of the A/M32A-86D generator set, what position do you place control switch S13 in to move the fuel rack and increase the engine speed to 2,000 revolutions per minute (RPM)?

    • IDLE

    • GENERATE

    • BUILD UP VOLTS

    • AUTO TEST BANK

    Correct Answer
    A. GENERATE
    Explanation
    To increase the engine speed to 2,000 RPM during the operation of the A/M32A-86D generator set, you would place control switch S13 in the "GENERATE" position.

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  • 18. 

    What component controls the strength of th A/M32A-86D generator 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 generator exciter field L2 in the A/M32A-86D generator. It regulates the voltage output of the generator, which in turn determines the strength of the exciter field. By adjusting the voltage, the voltage regulator can control the strength of the exciter field and ensure that it is at the desired level for proper generator operation.

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  • 19. 

    Refer to foldout 1.  Where is the best point to check voltage to the A/M32A-86D generator exciter field?

    • J8, terminal D-F

    • J8, terminal V-X

    • VR1, terminal C-R

    • Automatic/manual switch S1

    Correct Answer
    A. J8, terminal D-F
    Explanation
    The best point to check voltage to the A/M32A-86D generator exciter field is at J8, terminal D-F.

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  • 20. 

    Which step of troubleshooting is considered the most difficult?

    • Recognition and verification

    • Isolation and elimination

    • Repair and check

    • Analysis

    Correct Answer
    A. Analysis
    Explanation
    The step of troubleshooting that is considered the most difficult is analysis. This is because analysis involves examining all the available information, data, and evidence to identify the root cause of the problem. It requires critical thinking, problem-solving skills, and the ability to analyze complex systems or situations. Analysis often involves identifying patterns, making connections, and considering multiple factors to reach a conclusion. It can be challenging because there may be multiple possible causes or factors contributing to the problem, and it requires careful consideration and evaluation to determine the most likely cause.

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  • 21. 

    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 current is applied to the gate terminal of the SCR, it allows a larger current to flow from the anode to the cathode terminals. This characteristic makes it useful for controlling the power flow in various electronic circuits and systems.

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  • 22. 

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

    • Anode, cathode, 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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  • 23. 

    Apparent power is measured in

    • Kilovolts (KV)

    • Kilowatts

    • Kilo-volt-amperes (KVA)

    • Kilo-watt-amperes (KWZ)

    Correct Answer
    A. Kilo-volt-amperes (KVA)
    Explanation
    Apparent power refers to the total power consumed by an electrical system, which includes both the real power (measured in kilowatts) and the reactive power. The unit of measurement for apparent power is kilo-volt-amperes (KVA). This unit takes into account both the voltage (measured in kilovolts) and the current (measured in amperes) in the system. Therefore, kilo-volt-amperes (KVA) is the correct unit for measuring apparent power.

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  • 24. 

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

    • I3= 4amps and IT= 14 amps

    • I3=4 amps and IT=9amps

    • I3=4 amps and IT=18 amps

    • Not enough information to solve

    Correct Answer
    A. I3=4 amps and IT=9amps
    Explanation
    In a series-parallel circuit, the total current (IT) is equal to the sum of the currents in the series and parallel branches. Given that I1=9 amps and I2=5 amps, we can calculate IT by adding these two currents together: IT = I1 + I2 = 9 amps + 5 amps = 14 amps. Since the value of I3 is not listed, we cannot determine its value directly. However, since IT = I1 + I2, and I1 = I3 in a series circuit, we can conclude that I3 must be equal to I1, which is 9 amps. Therefore, the correct answer is I3=4 amps (not listed) and IT=9 amps.

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  • 25. 

    If a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is

    • Not allowing current to flow

    • Forward biased

    • Reverse biased

    • Turned on

    Correct Answer
    A. Forward biased
    Explanation
    When a negative potential is connected to the cathode and a positive potential is connected to the anode of a PN junction, the diode is forward biased. In this configuration, the positive potential at the anode repels the majority charge carriers in the N-region, while the negative potential at the cathode attracts the majority charge carriers in the P-region. This creates a low resistance path for current flow across the junction, allowing current to flow through the diode.

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  • 26. 

    In order to turn off a silicon-controlled rectifier (SCR), the current must drop below the

    • Trigger current

    • Holding current

    • Variable current

    • Breakdown current

    Correct Answer
    A. Holding current
    Explanation
    To turn off a silicon-controlled rectifier (SCR), the current must drop below the holding current. The holding current is the minimum current required to maintain the SCR in the on state once it has been triggered. If the current falls below this threshold, the SCR will turn off and stop conducting. Therefore, the holding current is the correct answer as it accurately describes the condition required to turn off an SCR.

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  • 27. 

    An A/M32A-86D is operating and the alternating current (AC) voltmeter is reading 200 volts alternating current (VAC) on all three phrases.  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
    Explanation
    Switching S15 to the L-N position will change the voltmeter reading from 200 VAC to a more appropriate value. This indicates that the current setting of S15 is incorrect and needs to be adjusted. Adjusting VR1 or R61 may not necessarily solve the issue, so the best course of action is to switch S15 to the L-N position.

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  • 28. 

    While operating an A/M32A-86D at governed speed, you place S13 in the build up position and the undervoltage light comes on.  What is a 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 on an A/M32A-86D at governed speed is the memory time delay relay. This relay is responsible for controlling the timing of various functions in the system, and if it is malfunctioning or not working properly, it could cause the undervoltage light to come on.

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  • 29. 

    In an inductive circuit, what is meant by current lags voltage by 90 degrees?

    • Current is zero when voltage is zero; voltage is maximum when current is maximum

    • Current is maximum when voltage is zero; voltage is maximum when current is zero

    • If current decreases, voltage aids in the decrease

    • If current increases, voltage aids the increase

    Correct Answer
    A. Current is maximum when voltage is zero; voltage is maximum when current is zero
    Explanation
    In an inductive circuit, current lags voltage by 90 degrees means that the current reaches its maximum value when the voltage is at its minimum value (zero), and vice versa. This is because in an inductive circuit, the voltage leads the current by 90 degrees. When the voltage is at its maximum value, the current is at its minimum value, and when the voltage is at its minimum value, the current is at its maximum value. This phase difference between current and voltage is a characteristic of inductive circuits.

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  • 30. 

    What is the basic principle of operation of transformers?

    • Mutual induction

    • Magnetic induction

    • Counterelectromotive force

    • Primary and secondary induction

    Correct Answer
    A. Mutual induction
    Explanation
    The basic principle of operation of transformers is mutual induction. Mutual induction refers to the process where a changing current in one coil induces a voltage in a nearby coil. In a transformer, this principle is utilized to transfer electrical energy from one circuit to another through electromagnetic induction. The primary coil, connected to an alternating current source, produces a changing magnetic field which induces a voltage in the secondary coil. This voltage can be stepped up or stepped down depending on the number of turns in each coil, allowing for efficient power transmission.

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  • 31. 

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

    • In a 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 a certain threshold, the zener diode starts conducting and provides a low-resistance path for the excess current to flow through. This prevents the voltage from rising further and protects the load from damage. By being connected in parallel, the zener diode does not affect the normal operation of the circuit but only comes into action when necessary.

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  • 32. 

    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). The exciter field voltage is supplied by a transformer (T1) and a rectifier (CR26). The transformer steps up or steps down the incoming voltage to the desired level, and the rectifier converts the alternating current (AC) into direct current (DC) to supply the exciter field. This combination of transformer and rectifier ensures that the exciter field receives the correct voltage for proper operation.

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  • 33. 

    What 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 B809A generator set fuel system uses an injector pump to distribute and deliver an accurate amount of fuel to the engine cylinders. The injector pump is responsible for pressurizing the fuel and injecting it into the cylinders at the correct timing and in the right amount. This ensures efficient combustion and proper engine performance. The transfer pump is responsible for transferring fuel from the fuel tank to the injector pump. Injector nozzles are responsible for atomizing the fuel and injecting it into the combustion chamber. The throttle actuator controls the airflow into the engine, but it is not directly related to the fuel distribution and delivery.

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  • 34. 

    What condition is sensed by the direct current (DC) card on the B809A generator set?

    • Overtemperature

    • Under frequency

    • Overfrequency

    • Low fuel

    Correct Answer
    A. Overtemperature
    Explanation
    The direct current (DC) card on the B809A generator set senses the condition of overtemperature. This means that it is designed to detect and monitor the temperature of the generator set and its components. If the temperature exceeds a certain threshold, the DC card will trigger an alarm or shut down the generator set to prevent damage or unsafe operation.

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  • 35. 

    What are the minority carriers in P-type material?

    • Holes

    • Protons

    • Neutrons

    • Electrons

    Correct Answer
    A. Electrons
    Explanation
    In P-type material, majority carriers are holes, which are positively charged. Minority carriers, on the other hand, are the opposite charge carriers, which in this case are electrons. Electrons are negatively charged and are present in lower concentrations compared to the majority carriers. Therefore, the correct answer is electrons.

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  • 36. 

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

    • 4

    • 3

    • 2

    • 1

    Correct Answer
    A. 2
    Explanation
    In a circuit using a bridge rectifier, there are two diodes that are forward biased during the first cycle of alternating current (AC). The bridge rectifier consists of four diodes arranged in a bridge configuration. During the positive half-cycle of AC, two diodes conduct and allow the current to flow through them, while the other two diodes are reverse biased and do not conduct. This allows the AC current to be converted into a pulsating DC current. Therefore, the correct answer is 2.

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  • 37. 

    To test the load contactor relay K1, using test probes, in what position must the automatic-manual voltage control switch be placed?

    • AUTOMATIC

    • MANUAL

    • TEST

    • OFF

    Correct Answer
    A. AUTOMATIC
    Explanation
    To test the load contactor relay K1, the automatic-manual voltage control switch must be placed in the AUTOMATIC position. This is because the load contactor relay K1 is controlled by the automatic mode of the voltage control switch. Placing the switch in the AUTOMATIC position will allow the relay to be tested using test probes.

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  • 38. 

    What section of the  gas turbine engine load control valve controls the opening time?

    • Diaphram

    • Rate control

    • Load control

    • Mechanical linkage

    Correct Answer
    A. Rate control
    Explanation
    The rate control section of the gas turbine engine load control valve controls the opening time. This section is responsible for regulating the rate at which the valve opens, allowing for precise control over the flow of fuel or air into the engine. By adjusting the rate control, the operator can effectively manage the engine's load and optimize its performance.

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  • 39. 

    What is the operting voltage of the blower motor and control relays on an A/M24T-8 load bank?

    • 12 volts direct current (VDC)

    • 28 VDC

    • 120volts alternating current (VAC)

    • 208 VAC

    Correct Answer
    A. 28 VDC
    Explanation
    The operating voltage of the blower motor and control relays on an A/M24T-8 load bank is 28 volts direct current (VDC).

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  • 40. 

    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
    The resistance in a circuit can be calculated using the formula P = I^2 * R, where P is the power rating, I is the total current, and R is the resistance. Rearranging the formula, we get R = P / I^2. Plugging in the given values, we have R = 40 / 2^2 = 40 / 4 = 10 ohms. Therefore, the correct answer is 10 ohms.

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  • 41. 

    What transformer winding acts as a conductor and provides the path into which voltage is induced?

    • Field

    • Primary

    • Secondary

    • Stationary

    Correct Answer
    A. Secondary
    Explanation
    The secondary winding of a transformer acts as a conductor and provides the path into which voltage is induced. When an alternating current flows through the primary winding, it creates a changing magnetic field. This changing magnetic field induces a voltage in the secondary winding, which can be used to power electrical devices or transmit power over long distances. The secondary winding is typically connected to the load or the circuit that requires the induced voltage.

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  • 42. 

    If the ignition control unit fails to operate on an A/M32A-60A during operation, what do you check?

    • Fuel solenoid L1

    • Fuel level relay K4

    • Bleed air solenoid L2

    • Oil pressure switch S11

    Correct Answer
    A. Oil pressure switch S11
    Explanation
    If the ignition control unit fails to operate on an A/M32A-60A during operation, one would check the oil pressure switch S11. This switch is responsible for monitoring the oil pressure in the system. If the oil pressure is too low or the switch is faulty, it can cause the ignition control unit to fail. Therefore, checking the oil pressure switch S11 is necessary to identify and resolve the issue with the ignition control unit.

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  • 43. 

    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. This is because insulators have a completely filled valence shell, which makes it difficult for them to gain or lose electrons and participate in electrical conductivity. In contrast, conductors have fewer than four electrons in their valence shell, allowing them to easily move and conduct electricity. Stable atoms refer to atoms that have a full valence shell and are not likely to react with other atoms. Semiconductors have properties between those of insulators and conductors, but the given range does not match their characteristics.

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  • 44. 

    The electrostatic fields around a positive ion move

    • Inward

    • Outward

    • Inward, then outward

    • Outward, then inward

    Correct Answer
    A. Outward
    Explanation
    The correct answer is "outward" because positive ions have a deficiency of electrons, causing them to have a positive charge. In electrostatic fields, positive charges repel each other, so the electrostatic field lines around a positive ion will move away from each other, or outward. This movement is a result of the repulsion between the positive charges, creating an outward flow of the electrostatic field lines.

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  • 45. 

    The force required to move free electrons through a conductor is known as

    • Current

    • Voltage

    • Negative charge

    • Electrostatic force

    Correct Answer
    A. Voltage
    Explanation
    Voltage is the correct answer because it refers to the force or electrical potential difference that drives the movement of free electrons through a conductor. It is the measure of the energy per unit charge that is required to move the electrons. Current, on the other hand, refers to the flow of charge itself, while negative charge and electrostatic force are not specifically related to the force required to move electrons through a conductor.

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  • 46. 

    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 created due to the diffusion of minority carriers across the junction, resulting in the formation of a region devoid of free charge carriers. The depletion region acts as a barrier for the flow of current, preventing the majority carriers from crossing the junction. It plays a crucial role in the operation of various semiconductor devices, such as diodes and transistors.

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  • 47. 

    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
    In a series-parallel circuit, the total resistance (RT) can be calculated by adding the resistances of the series resistors and the reciprocal of the sum of the reciprocals of the parallel resistors. In this case, the series resistor R1 has a resistance of 7 ohms. The parallel resistors R2 and R3 have a combined resistance of 8 ohms. Therefore, the total resistance is 7 ohms + 8 ohms = 15 ohms.

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  • 48. 

    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 way, the zener diode acts as a voltage regulator by maintaining a constant voltage across the load. It does this by allowing current to flow through itself when the voltage across the load exceeds the breakdown voltage of the zener diode. This effectively limits the voltage across the load, preventing it from exceeding the desired value.

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  • 49. 

    Refer to foldout 2.  While operating a B809A generator, what switch is closed to provide potential to the exciter field?

    • S1, master switch

    • S5, run/idle toggle switch

    • S3, interlock toggle switch

    • PB2, output control push button switch

    Correct Answer
    A. S5, run/idle toggle switch
    Explanation
    The correct answer is S5, run/idle toggle switch. This switch is closed to provide potential to the exciter field while operating the B809A generator.

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Quiz Review Timeline (Updated): Mar 21, 2023 +

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  • Mar 21, 2023
    Quiz Edited by
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  • May 21, 2014
    Quiz Created by
    Dunlapryan
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