2A672 EOC Practice Test

Reviewed by Editorial Team
The ProProfs editorial team is comprised of experienced subject matter experts. They've collectively created over 10,000 quizzes and lessons, serving over 100 million users. Our team includes in-house content moderators and subject matter experts, as well as a global network of rigorously trained contributors. All adhere to our comprehensive editorial guidelines, ensuring the delivery of high-quality content.
Learn about Our Editorial Process
| By A1c2a652
A
A1c2a652
Community Contributor
Quizzes Created: 1 | Total Attempts: 404
| Attempts: 404
SettingsSettings
Please wait...
  • 1/90 Questions

    When troubleshooting any electrical system, start by first finding the 

    • Common ground bus
    • Main circuit breaker
    • External power source
    • Last known source of power
Please wait...
2A672 EOC Practice Test - Quiz
About This Quiz

The 2A672 EOC Practice Test assesses knowledge in electronics and circuit theory, focusing on atomic structure, electron behavior, material resistance, and circuit calculations. It is designed to enhance understanding and application skills in these areas, relevant for learners in physics and engineering.

Quiz Preview

  • 2. 

    When the -16 load bank set load time as been reached the

    • Load is automatically removed and the cooling cycle begins

    • Load bank will start the load test over again

    • Load bank will automatically shut down

    • Display will show results of the load test

    Correct Answer
    A. Load is automatically removed and the cooling cycle begins
    Explanation
    When the load time of -16 load bank is reached, the load is automatically removed and the cooling cycle begins. This indicates that the load bank is designed to operate within a specific time limit, and once that limit is reached, it initiates the cooling process to prevent overheating or any potential damage. The load test will not start over again, the load bank will not automatically shut down, and the display will not show the results of the load test.

    Rate this question:

  • 3. 

    This action occurs when the B809 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 B809 AC card senses an AC supply fault, it triggers the opening of the AC contactor and also stops the generator output. This means that both the AC contactor opens and the generator output stops simultaneously.

    Rate this question:

  • 4. 

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

    • Complete

    • Unstable

    • Charged

    • Stable

    Correct Answer
    A. Stable
    Explanation
    When 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 fully filled with electrons. According to the octet rule, 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 that the atom has achieved a stable electron configuration, making it stable.

    Rate this question:

  • 5. 

    In an atom, this electron contains the most energy.

    • Stationary electrons

    • Orbiting electrons

    • Valence electrons

    • K shell electrons

    Correct Answer
    A. Valence electrons
    Explanation
    Valence electrons are the electrons located in the outermost energy level of an atom. These electrons have the highest energy because they are farthest from the positively charged nucleus and experience less attraction. Valence electrons play a crucial role in chemical bonding and determining the reactivity of an element.

    Rate this question:

  • 6. 

    This is the function of the deswirl ring on a -95 gas turbine compressor.

    • Accelerate air

    • Decrease air velocity

    • Increase air pressure

    • Smooth turbulent air flow

    Correct Answer
    A. Smooth turbulent air flow
    Explanation
    The deswirl ring on a gas turbine compressor is designed to smooth turbulent air flow. Turbulence in the air flow can cause inefficiencies and reduce the overall performance of the compressor. The deswirl ring helps to eliminate or reduce turbulence by redirecting and controlling the flow of air, resulting in a smoother and more efficient airflow. This allows for better compression of the air and improves the overall performance of the gas turbine compressor.

    Rate this question:

  • 7. 

    This is relative motion between a conductor and a magnetic field that causes voltage to be induced.

    • Magnetism

    • Reluctance

    • Direct current

    • Electromagnetic induction

    Correct Answer
    A. Electromagnetic induction
    Explanation
    Electromagnetic induction is the process in which a voltage is induced in a conductor when it is moved relative to a magnetic field. This phenomenon is based on Faraday's law of electromagnetic induction, which states that a changing magnetic field induces an electric current in a conductor. Therefore, when there is relative motion between a conductor and a magnetic field, voltage is induced in the conductor through electromagnetic induction.

    Rate this question:

  • 8. 

    This statement best describes a diode.

    • It is a five-terminal device

    • It is a three-terminal device

    • It has the ability to conduct in one direction and not the other

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

    Correct Answer
    A. It 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 property is known as rectification and is the main characteristic of a diode. It is commonly used in electronic circuits to convert alternating current (AC) to direct current (DC) by blocking the negative half of the AC waveform. Therefore, the statement "It has the ability to conduct in one direction and not the other" accurately describes a diode.

    Rate this question:

  • 9. 

    If there is a loss of residual magnetism in the exciter field poles

    • 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 generator can be field flashed to restore the magnetism. This can be done by connecting TB4-11 to a 14 VDC power source. It is important to check the field transformer and the fault display to identify any issues that may have caused the loss of residual magnetism.

    Rate this question:

  • 10. 

    This gas turbine engine component is specifically designed to break if the engine locks up.

    • Second stage impellar

    • First stage diffuser

    • Compressor shaft

    • Torsion shaft

    Correct Answer
    A. Torsion shaft
    Explanation
    The torsion shaft is designed to break if the engine locks up in order to protect the rest of the engine components from damage. When the engine locks up, it creates a sudden increase in torque and rotational force. The torsion shaft is designed to absorb and distribute this force, but if it exceeds a certain threshold, the shaft will break. This prevents further damage to the engine and allows for a controlled shutdown.

    Rate this question:

  • 11. 

    Which components on the EPU-6/E frequency converter must be inspected prior to use?

    • Air inlets for blockage

    • Wiring for secure mounting

    • Exterior air vents for corrosion

    • Interior air vents for secure mounting

    Correct Answer
    A. Air inlets for blockage
    Explanation
    The air inlets on the EPU-6/E frequency converter need to be inspected prior to use to ensure that they are not blocked. If the air inlets are blocked, it can restrict the airflow and cause overheating of the converter, potentially leading to damage or malfunction. Inspecting the air inlets for blockage is important to ensure proper ventilation and efficient operation of the frequency converter.

    Rate this question:

  • 12. 

    This switch on the -95 starts the automatic starting cycle.

    • Turbine start

    • Air load

    • Inhibit

    • Master

    Correct Answer
    A. Turbine start
    Explanation
    The given correct answer, "turbine start," suggests that the switch on the -95 is responsible for initiating the automatic starting cycle of the turbine. This switch likely activates the necessary mechanisms and processes that are required to start the turbine.

    Rate this question:

  • 13. 

    Which kind of loads is the -16 load bank designed to test?

    • Alternating current (AC)

    • Direct current (DC)

    • AC and DC

    • AC, DC, and generator exciter

    Correct Answer
    A. AC and DC
    Explanation
    The -16 load bank is designed to test both alternating current (AC) and direct current (DC) loads. It is capable of simulating various electrical loads to assess the performance and capacity of power systems that utilize both AC and DC currents. Additionally, the load bank can also be used to test generator exciters, which are responsible for providing the necessary current to the generator field winding.

    Rate this question:

  • 14. 

    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 drops below this threshold, the SCR will turn off and stop conducting current. The trigger current, on the other hand, is the minimum current required to initially turn on the SCR. Variable current and breakdown current are not relevant to turning off the SCR.

    Rate this question:

  • 15. 

    The MA-3D air conditioner engine is operating at 1,250 revolutions per minute (RPM), but the blower clutch does not engage. What action, if any, do you take?

    • Replace SW2

    • Replace the engine speed control

    • Nothing; this is normal operation. The blower clutch energizes at governed speed

    • Check the blower clutch switch to make sure it's receiving the proper signal from the engine speed control

    Correct Answer
    A. Nothing; this is normal operation. The blower clutch energizes at governed speed
    Explanation
    The correct answer states that no action needs to be taken because this is normal operation. The blower clutch will only engage at the governed speed, which means that it will not engage at 1,250 RPM. Therefore, there is no need to replace any parts or check any switches.

    Rate this question:

  • 16. 

    These SGNSC components separate nitrogen from the oxygen.

    • Nitrogen generators (NG)

    • Air separator membranes (ASM)

    • Nitrogen/air separator filters (NASF)

    • Nitrogen separator membranes (NSM)

    Correct Answer
    A. Air separator membranes (ASM)
    Explanation
    The correct answer is air separator membranes (ASM). Air separator membranes are components that are used to separate nitrogen from oxygen in a nitrogen generator system. These membranes selectively allow oxygen molecules to pass through while blocking nitrogen molecules, resulting in the production of nitrogen gas. This process is based on the principle of selective permeation, where the membrane material allows for the separation of different gases based on their molecular size and properties. Therefore, air separator membranes are crucial in the nitrogen separation process.

    Rate this question:

  • 17. 

    Which does frosting of a refrigeration system line or component indicate?

    • Open

    • Blockage

    • Condensing refrigerant

    • Low refrigerant charge

    Correct Answer
    A. Blockage
    Explanation
    Frosting of a refrigeration system line or component indicates a blockage. When there is a blockage in the system, the flow of refrigerant is restricted, causing the temperature to drop and leading to the formation of frost. This can occur due to various reasons such as debris, ice buildup, or a malfunctioning component. Identifying and resolving the blockage is important to ensure proper functioning and efficiency of the refrigeration system.

    Rate this question:

  • 18. 

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

    • Capacitance increases

    • Capacitance decreases

    • Capacitance remains the same

    • Capacitance increases only if the plate size doubles

    Correct Answer
    A. Capacitance increases
    Explanation
    When the size of the plates of a capacitor is increased, the distance between the plates decreases. This results in an increase in the capacitance of the capacitor. Capacitance is directly proportional to the surface area of the plates and inversely proportional to the distance between them. Therefore, when the plate size is increased, the capacitance increases.

    Rate this question:

  • 19. 

    This B809 speed control system component produces a 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 a component of the B809 speed control system that generates a frequency pulse train. This pulse train is used as a reference for the engine speed. The magnetic pick-up detects the rotation of a gear or flywheel and converts it into an electrical signal, which is then used by the speed control system to regulate the engine speed.

    Rate this question:

  • 20. 

    During the operation of a -60, the exhaust gas temperature is excessively high. Which is the probable cause?

    • Air oil seals

    • Fuel atomizer

    • Torus assembly

    • Pneumatic thermostat

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

    Rate this question:

  • 21. 

    During operation of the EPU-6/E frequency converter it is determined that E and F pin voltage is not needed for the aircraft. Therefore, place the loop/bypass/28 V to aircraft switch to which position?

    • 28 V TO AIRCRAFT

    • NEUTRAL

    • BYPASS

    • LOOP

    Correct Answer
    A. BYPASS
    Explanation
    During the operation of the EPU-6/E frequency converter, it has been determined that the E and F pin voltage is not required for the aircraft. Therefore, the loop/bypass/28 V to aircraft switch should be placed in the BYPASS position.

    Rate this question:

  • 22. 

    Refer to foldout 1. You are driving on the flight line and notice a -86 with all the fault lights on. You try to reset S23, but the lights stay on. Which is a probable cause of this trouble?

    • S30 is shorted

    • S23 is stuck open

    • K17 contacts are closed

    • K23 contacts are closed

    Correct Answer
    A. S30 is shorted
    Explanation
    The probable cause of the trouble is that S30 is shorted. This means that there is a connection between the two terminals of S30, which is causing a fault in the system. This short circuit is preventing the reset of S23 from effectively turning off the fault lights.

    Rate this question:

  • 23. 

    Which component on the B809 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 B809 fuel system that distributes and delivers an accurate amount of fuel to the engine cylinders. It is responsible for pressurizing the fuel and delivering it to the injectors at the correct time and in the correct quantity. The injector pump plays a crucial role in ensuring the engine receives the precise amount of fuel needed for optimal combustion and performance.

    Rate this question:

  • 24. 

    On the -60, fuel transfer to the main tanks stop when the 

    • Main tanks are 1/2 full

    • Main tanks are 3/4 full

    • Auxiliary tank is half empty

    • Auxiliary tank is completely empty

    Correct Answer
    A. Main tanks are 3/4 full
    Explanation
    When the main tanks are 3/4 full, fuel transfer to the main tanks stops. This means that once the main tanks reach 75% capacity, the fuel transfer from the auxiliary tank to the main tanks is halted. This is likely done to prevent overfilling of the main tanks and to ensure that there is enough fuel remaining in the auxiliary tank for future use.

    Rate this question:

  • 25. 

    Which component determines the speed of the SGNSC's nitrogen booster compressor?

    • Engine

    • End of stroke limit switch

    • Programmable logic controller (PLC) circuit

    • Directional control valve cycling control relay

    Correct Answer
    A. Programmable logic controller (PLC) circuit
    Explanation
    The speed of the SGNSC's nitrogen booster compressor is determined by the programmable logic controller (PLC) circuit. The PLC circuit is responsible for controlling and regulating the operation of various components in the system, including the compressor. It receives input signals, processes them according to a programmed logic, and generates output signals to control the speed and operation of the compressor. By adjusting the parameters and logic within the PLC circuit, the speed of the compressor can be effectively controlled to meet the desired requirements of the system.

    Rate this question:

  • 26. 

    Refer to foldout 1. Where is the best point to check voltage going to the -86 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 going to the -86 exciter field is at J8, terminal D-F.

    Rate this question:

  • 27. 

    Which board(s) is/are used for maintenance and troubleshooting on the -16 load bank?

    • Verification

    • Six load element

    • Resistance check

    • Verification and resistance check

    Correct Answer
    A. Verification and resistance check
    Explanation
    The -16 load bank requires the use of both verification and resistance check boards for maintenance and troubleshooting. These boards are essential for ensuring that the load bank is functioning properly and that the resistance values are within acceptable limits. The verification board helps to verify the overall performance and functionality of the load bank, while the resistance check board is specifically used to check and measure the resistance values of the load elements. Using both boards together allows for a comprehensive assessment of the load bank's condition and helps in identifying any issues or faults that may need to be addressed.

    Rate this question:

  • 28. 

    When would you perform a current or voltage calibration on the -16 load bank?

    • Never, the load bank automatically performs calibrations

    • When input values are outside acceptable tolerances

    • Prior to placing the load on test unit

    • After a load test is complete

    Correct Answer
    A. When input values are outside acceptable tolerances
    Explanation
    The correct answer is "Never, the load bank automatically performs calibrations when input values are outside acceptable tolerances." This means that the load bank will automatically calibrate itself when the input values deviate from the acceptable range. Therefore, there is no need to manually perform a current or voltage calibration on the load bank.

    Rate this question:

  • 29. 

    This section of the -60 gas turbine engine load control valve assembly controls the butterfly valve opening time.

    • Diaphragm

    • Rate control

    • Load control

    • Mechanical linkage

    Correct Answer
    A. Rate control
    Explanation
    The correct answer is "rate control" because it is the component in the -60 gas turbine engine load control valve assembly that controls the opening time of the butterfly valve. It regulates the rate at which the valve opens, allowing for precise control of the engine's load.

    Rate this question:

  • 30. 

    In a series-parallel circuit, the series current at I1 = 9 amps; in two parallel branches, I2 = 5 amps; and the value of I3 is not listed. Use Ohm'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
    In a series-parallel circuit, the total current (IT) is equal to the sum of the currents in the series branches. Since I1 = 9 amps and I2 = 5 amps, the total current IT can be calculated as 9 + 5 = 14 amps.

    Since I3 is not listed, we need to use Ohm's law to find its value. In a parallel circuit, the voltage across each branch is the same. Therefore, we can use the current in one branch (I2 = 5 amps) and the total resistance of the parallel branches to find the voltage. Once we have the voltage, we can use Ohm's law again to find I3.

    Since the question does not provide any information about the resistance values, we cannot calculate the value of I3. Therefore, the answer is "not enough information to solve".

    Rate this question:

  • 31. 

    Refer to foldout 1. While operating a -86 at governed speed, you place S13 in the BUILD UP position and the UNDERVOLTAGE light comes on. Which 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 trouble is the memory time delay relay. When the S13 switch is placed in the BUILD UP position, it triggers the memory time delay relay. However, in this scenario, the UNDERVOLTAGE light comes on, indicating that there might be an issue with the relay. The memory time delay relay is responsible for controlling the timing functions in the system, and if it malfunctions, it can cause the UNDERVOLTAGE light to come on.

    Rate this question:

  • 32. 

    In the -60 gas turbine engine lubrication system, how does the oil pressure relief valve control the output of the main oil pump?

    • Through the filter bypass valve

    • Through the oil pressure sequencing switch

    • By bypassing excess oil back to the oil filter inlet

    • By bypassing excess oil back to the main pump inlet

    Correct Answer
    A. By bypassing excess oil back to the main pump inlet
    Explanation
    The oil pressure relief valve controls the output of the main oil pump by bypassing excess oil back to the main pump inlet. This means that when the oil pressure exceeds a certain level, the relief valve opens and diverts the excess oil back to the inlet of the main pump, preventing damage to the system. This helps regulate the oil pressure and ensures that it remains within the desired range for optimal engine lubrication.

    Rate this question:

  • 33. 

    On a -95 which chambers are pressurized when the butterfly valve is closed?

    • 1 and 3

    • 2 and 4

    • 1, 2 and 3

    • 1, 3 and 4

    Correct Answer
    A. 1, 3 and 4
    Explanation
    When the butterfly valve is closed on a -95, chambers 1, 3, and 4 are pressurized.

    Rate this question:

  • 34. 

    Refer to foldout 2. While operating a B809, which 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 pushbutton 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 a B809.

    Rate this question:

  • 35. 

    Refer to foldout 5. The DC voltmeter on a -60 fails to indicate during operation. Which is the probable cause of this trouble?

    • K6 is defective

    • TR1 is defective

    • R6 requires adjustment

    • S4 is in the OFF position

    Correct Answer
    A. TR1 is defective
    Explanation
    The probable cause of the DC voltmeter on a -60 failing to indicate during operation is that TR1 is defective. TR1 is a component that could be responsible for the malfunction of the voltmeter, causing it to fail to indicate the correct readings.

    Rate this question:

  • 36. 

    This is the minimum interval that the input and output terminals of the EPU-6/E are inspected.

    • Daily

    • Prior to use

    • Every 6 months

    • Every 12 months

    Correct Answer
    A. Every 6 months
    Explanation
    The correct answer is every 6 months because the question is asking for the minimum interval at which the input and output terminals of the EPU-6/E are inspected. This means that the terminals need to be inspected at least once every 6 months to ensure proper functioning and maintenance of the EPU-6/E.

    Rate this question:

  • 37. 

    To test the load contactor relay K1 using test probes, in which 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 using test probes, the automatic-manual voltage control switch must be placed in the AUTOMATIC position. This is because the automatic position allows the relay to function based on the preset voltage control settings, enabling accurate testing of the load contactor relay. Placing the switch in any other position may disrupt the relay's operation or provide inaccurate results.

    Rate this question:

  • 38. 

    When a -60 is started, which component de-energizes when the engine reaches 95 percent of its speed?

    • Starter relay

    • Ignition unit

    • Ready to load light

    • Acceleration limiter valve

    Correct Answer
    A. Ignition unit
    Explanation
    When a -60 is started, the ignition unit de-energizes when the engine reaches 95 percent of its speed. This is because the ignition unit is responsible for providing the spark that ignites the fuel-air mixture in the engine cylinders. Once the engine reaches 95 percent of its speed, the ignition unit is no longer needed as the combustion process is self-sustaining. Therefore, it is de-energized to conserve energy and prevent any potential damage to the engine.

    Rate this question:

  • 39. 

    A bridge rectifier is installed in an alternating current (AC) circuit to

    • Decrease direct current (DC) pulses

    • Provide fullwave rectification

    • Provide halfwave rectification

    • Decrease ripple frequency

    Correct Answer
    A. Provide fullwave rectification
    Explanation
    A bridge rectifier is installed in an alternating current (AC) circuit to provide fullwave rectification. This means that it converts the AC voltage into a pulsating DC voltage that flows in the same direction. The bridge rectifier uses four diodes arranged in a bridge configuration to rectify both the positive and negative halves of the AC cycle, resulting in a smoother and more continuous output. This is different from halfwave rectification, where only one half of the AC cycle is rectified. Providing fullwave rectification allows for a more efficient conversion of AC to DC power.

    Rate this question:

  • 40. 

    Refer to foldout 1. The -86 is supplying 115 VAC to the aircraft and all of a sudden the AC contactor opens and there is no voltage indication on M2. Which is the probable cause of this trouble?

    • Load contactor

    • CR17 forward biased

    • Overvoltage/undervoltage relay

    • Memory time-delay relay energized

    Correct Answer
    A. Memory time-delay relay energized
    Explanation
    The probable cause of the trouble is that the memory time-delay relay is energized. This relay is responsible for introducing a time delay before allowing the AC contactor to close. If the relay is energized, it means that it is preventing the AC contactor from closing and supplying voltage to M2. This could be due to a malfunction or a fault in the relay, causing it to stay energized and not allowing the voltage to pass through.

    Rate this question:

  • 41. 

    This -95 engine component accelerates hot expanding gases and directs them into the nozzle ring.

    • Torus assembly

    • Combustor can

    • Combustor cap

    • Plenum

    Correct Answer
    A. Torus assembly
    Explanation
    The torus assembly is the correct answer because it is the engine component that accelerates hot expanding gases and directs them into the nozzle ring. The torus assembly is designed to efficiently channel and control the flow of gases, ensuring optimal performance and thrust generation in the engine.

    Rate this question:

  • 42. 

    These factors 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 resistance of a material is influenced by its area, temperature, and type of material. The area of a material affects its resistance because a larger area provides more paths for the current to flow, resulting in lower resistance. Temperature also affects resistance as an increase in temperature leads to an increase in resistance due to the increased collisions between the atoms or molecules in the material. Additionally, the type of material determines its resistivity, which is a measure of how strongly it resists the flow of electric current.

    Rate this question:

  • 43. 

    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 AC, two diodes conduct and become forward biased, allowing the current to flow through them. The other two diodes remain reverse biased and do not conduct. Therefore, the correct answer is 2.

    Rate this question:

  • 44. 

    These are the three leads of a unijunction transistor (UJT).

    • 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 correct answer is emitter, base 1, and base 2. In a unijunction transistor (UJT), the emitter is the terminal through which the majority carriers (electrons) enter the device. Base 1 and base 2 are the two terminals that control the flow of current between the emitter and the other two terminals. The UJT operates by varying the resistance between base 1 and base 2, which in turn controls the current flow through the emitter.

    Rate this question:

  • 45. 

    The emitter in a unijunction transistor always points toward the 

    • Base 1 lead

    • Collector

    • Emitter

    • Gate

    Correct Answer
    A. Base 1 lead
    Explanation
    In a unijunction transistor, the emitter is always connected to the base 1 lead. This is because the base 1 lead is responsible for controlling the flow of current in the transistor. By connecting the emitter to the base 1 lead, the transistor can regulate the current effectively. The collector, on the other hand, is responsible for collecting the current that flows through the transistor, while the gate is not applicable in a unijunction transistor. Therefore, the emitter always points towards the base 1 lead.

    Rate this question:

  • 46. 

    Refer to foldout 1. A -86 is operating and the AC voltmeter is reading 200 volts VAC on all three phases. Which 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 from reading the voltage between phases to reading the voltage between line and neutral. This is necessary because the AC voltmeter is currently reading 200 volts VAC on all three phases, which indicates a problem with the voltage measurement. By switching S15 to the L-N position, the voltmeter will be able to accurately measure the voltage between line and neutral, providing a correct reading.

    Rate this question:

  • 47. 

    Which contacts on the annunciator card of the B809 generator set control the AC input to the voltage regulator?

    • Engine fault

    • Regulator fault

    • Generator fault

    • Contactor fault

    Correct Answer
    A. Generator fault
    Explanation
    The contacts on the annunciator card of the B809 generator set that control the AC input to the voltage regulator are referred to as "generator fault." These contacts are responsible for indicating any faults or issues related to the generator, such as low voltage or overload conditions. By monitoring these contacts, the voltage regulator can receive the necessary input to regulate and control the AC input to the generator, ensuring proper functioning and protection of the system.

    Rate this question:

  • 48. 

    Refer to foldout 13. While you are operating an MA-3D air conditioner, the output air temperature is too high, so you set the temperature control to maximum cooling. The temperature controller sends a signal to 

    • B7 which steps closed to meter refrigerant into the evaporator

    • B7 which steps open to meter refrigerant into the evaporator

    • The quench valve which opens to aid in cooling

    • S1 and S2 which open to aid in cooling

    Correct Answer
    A. B7 which steps open to meter refrigerant into the evaporator
    Explanation
    When the output air temperature of the MA-3D air conditioner is too high, setting the temperature control to maximum cooling is done to decrease the temperature. In this scenario, the temperature controller sends a signal to B7, which steps open to meter refrigerant into the evaporator. This means that B7 opens up to allow a controlled amount of refrigerant to enter the evaporator, which helps in the cooling process.

    Rate this question:

  • 49. 

    This is how a zener diode is 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
    A 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 and limits the voltage across the load to the breakdown voltage. This ensures that the load is protected from excessive voltage and prevents any damage to it.

    Rate this question:

Quiz Review Timeline (Updated): Mar 22, 2023 +

Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Oct 17, 2017
    Quiz Created by
    A1c2a652

Recent Quizzes

Electronics First Online Short Quiz Electronics First Online Short Quiz
HERO SKILL INNOVATION AND EMPLOYABILITY PROGRAM HERO SKILL INNOVATION AND EMPLOYABILITY PROGRAM
TRISHNA - the technical QUIZ TRISHNA - the technical QUIZ
ANALOG AND DIGITAL ELECTRONICS ANALOG AND DIGITAL ELECTRONICS
General Science Review Question General Science Review Question
Electronics Basics! Trivia Knowledge! Quiz Electronics Basics! Trivia Knowledge! Quiz
Advertisement
×

Wait!
Here's an interesting quiz for you.

We have other quizzes matching your interest.