2A656 Vol 3 Ure (2013)

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  • 1/72 Questions

    (401) The constant speed drive (CSD) that is used to drive a 60/80 kilovolts amperes (kVA) generator has an output of approximately

    • 4,000 revolutions per minute (rpm).
    • 6,000 rpm.
    • 8,000 rpm.
    • 10,000 rpm.
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About This Quiz

This quiz, titled '2A656 VOL 3 URE (2013)', assesses knowledge on AC power systems in aerospace contexts, focusing on components like CSDs, GCUs, and GLCs. It evaluates understanding of generator operations, load control, and emergency power management, crucial for professionals in aerospace electrical engineering.

2A656 Vol 3 Ure (2013) - Quiz

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  • 2. 

    (401) In an alternating current (AC) power supply system, which component controls load division during parallel generator operation?Type question here

    • Load controller.

    • Underspeed switch.

    • Constant speed drive.

    • Generator control unit.

    Correct Answer
    A. Load controller.
    Explanation
    The load controller is responsible for controlling load division during parallel generator operation in an AC power supply system. It ensures that the load is evenly distributed among the generators, preventing overloading of any one generator. This helps to maintain the stability and efficiency of the system.

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  • 3. 

    (401) The undervoltage activation point for the main generator in a volts alternating current (VAC) power supply system is

    • 93 [±3] VAC.

    • 103 [±3] VAC.

    • 115 [±2] VAC.

    • 125 [±2] VAC.

    Correct Answer
    A. 103 [±3] VAC.
    Explanation
    The correct answer is 103 [±3] VAC. This means that the undervoltage activation point for the main generator in a VAC power supply system is 103 volts with a tolerance of ±3 volts. This indicates that if the voltage drops below 100 volts or rises above 106 volts, the undervoltage protection will be activated and take necessary actions to prevent damage to the system.

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  • 4. 

    (401) At what volts alternating current (VAC) range does the generator control unit (GCU) in an AC power supply system maintain generator output?

    • 135 [±3] VAC.

    • 125 [±3] VAC.

    • 115 [±2] VAC.

    • 105 [±2] VAC.

    Correct Answer
    A. 115 [±2] VAC.
    Explanation
    The generator control unit (GCU) in an AC power supply system maintains the generator output at 115 [±2] VAC. This means that the GCU is designed to regulate the voltage output of the generator within a range of 113 to 117 VAC, with a tolerance of ±2 volts. This ensures that the generator produces a stable and consistent voltage output within this specified range, which is suitable for powering electrical devices and equipment in the AC power supply system.

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  • 5. 

    (401) In an alternating current (AC) power supply system, what component connects the 115/200 volts alternating current (VAC) main generator output to the main power buses?

    • Bus tie lockout (BTL).

    • Bus tie contactor (BTC).

    • Generator control unit (GCU).

    • Generator line contactor (GLC).

    Correct Answer
    A. Generator line contactor (GLC).
    Explanation
    The correct answer is Generator line contactor (GLC). In an AC power supply system, the GLC connects the 115/200 volts AC main generator output to the main power buses. The GLC is responsible for controlling the flow of electricity from the generator to the power buses, allowing the power to be distributed to the various electrical loads in the system. The GLC is an important component in ensuring the proper functioning and distribution of power in an AC power supply system.

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  • 6. 

    (402) Which emergency alternating current (AC) power system component connects the output of the emergency generator to the essential bus?

    • Emergency power disconnect relay (EPDR).

    • Emergency power interlock relay (EPIR).

    • Emergency generator test switch (EGTS).

    • Power fail relay (PFR).

    Correct Answer
    A. Emergency power disconnect relay (EPDR).
    Explanation
    The emergency power disconnect relay (EPDR) is the component that connects the output of the emergency generator to the essential bus. This relay is responsible for ensuring that the emergency power is properly distributed to the essential systems in case of a power failure. It acts as a switch, connecting the generator output to the essential bus when needed and disconnecting it when not needed. This ensures that the essential systems receive power from the generator when necessary, providing a reliable source of electricity during emergencies.

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  • 7. 

    (402) Which emergency alternating current (AC) power system component prevents the emergency generator from dropping off-line when the aircraft lands?

    • Emergency power disconnect relay (EPDR).

    • Emergency power interlock relay (EPIR).

    • Emergency generator test switch (EGTS).

    • Power fail relay (PFR).

    Correct Answer
    A. Emergency power interlock relay (EPIR).
    Explanation
    The emergency power interlock relay (EPIR) is the component that prevents the emergency generator from dropping off-line when the aircraft lands. This relay is responsible for maintaining the connection between the generator and the aircraft's electrical system, ensuring a continuous power supply even during landing. It acts as a safety measure to prevent any interruptions in power during critical moments.

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  • 8. 

    (402) What is the minimum volts alternating current (VAC) requirement to energize the emergency power disconnect relay (EPDR)?

    • 90 VAC from A phase.

    • 90 VAC from C phase.

    • 93 VAC from A phase.

    • 93 VAC from C phase.

    Correct Answer
    A. 93 VAC from C phase.
    Explanation
    The minimum volts alternating current (VAC) requirement to energize the emergency power disconnect relay (EPDR) is 93 VAC from the C phase. This means that in order to activate the EPDR, a minimum voltage of 93 VAC needs to be supplied from the C phase of the alternating current source.

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  • 9. 

    (403) What external power system component disconnects external power from the aircraft?

    • Bus protection panel (BPP).

    • Auxiliary power unit (APU).

    • APU/external power contactor (AEPC).

    • APU/external power disconnect contactor (AEDC).

    Correct Answer
    A. APU/external power disconnect contactor (AEDC).
    Explanation
    The external power system component that disconnects external power from the aircraft is the APU/external power disconnect contactor (AEDC). This component is responsible for isolating the aircraft from the external power source, ensuring that there is no electrical connection between the aircraft and the external power supply. By disconnecting the external power, the AEDC helps to prevent any potential electrical issues or damage to the aircraft's electrical system.

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  • 10. 

    (403) The auxiliary source selected to power the tie bus in the auxiliary power unit (APU) is determined by the

    • Lockout relay (LOR).

    • Bus protection panel (BPP).

    • APU/external power contactor (AEPC).

    • APU external power disconnect contactor (AEDC).

    Correct Answer
    A. APU/external power contactor (AEPC).
    Explanation
    The correct answer is APU/external power contactor (AEPC). The auxiliary source selected to power the tie bus in the auxiliary power unit (APU) is determined by the APU/external power contactor (AEPC). This means that either the APU or an external power source can be used to power the tie bus, depending on the position of the AEPC. The lockout relay (LOR) is not responsible for determining the power source for the tie bus. The bus protection panel (BPP) and APU external power disconnect contactor (AEDC) are not mentioned in relation to selecting the power source for the tie bus.

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  • 11. 

    (403) What relays connect the auxiliary power source to the aircraft buses?

    • Bus tie connector (BTC).

    • Bus protection panel (BPP).

    • APU/external power contactor (AEPC).

    • APU/external power disconnect contactor (AEDC).

    Correct Answer
    A. Bus tie connector (BTC).
    Explanation
    The bus tie connector (BTC) is responsible for connecting the auxiliary power source to the aircraft buses. It serves as a relay that allows power to flow between different electrical systems on the aircraft. The BTC ensures that power is distributed properly and that the aircraft's electrical systems can operate efficiently.

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  • 12. 

    (404) During which troubleshooting step do you review the Air Force Technical Order (AFTO) Form 781A?

    • Learn normal system operation.

    • Define the discrepancy.

    • Limit the malfunction.

    • Take meter readings.

    Correct Answer
    A. Define the discrepancy.
    Explanation
    During the troubleshooting process, reviewing the Air Force Technical Order (AFTO) Form 781A is done in order to define the discrepancy. This form contains information about the specific problem or issue that needs to be addressed. By reviewing this form, technicians can gather relevant details and specifications related to the discrepancy, which helps them in identifying the root cause and developing an appropriate solution. This step is crucial in effectively troubleshooting and resolving the problem.

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  • 13. 

    (405) The transformer rectifier units in a volts direct current (VDC) power system convert three-phase 115 volts alternating current (VAC) into

    • 10 to 12 VDC.

    • 26 to 31 VDC.

    • 32 to 36 VDC.

    • 52 to 56 VDC.

    Correct Answer
    A. 26 to 31 VDC.
    Explanation
    The transformer rectifier units in a VDC power system convert three-phase 115 VAC into 26 to 31 VDC.

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  • 14. 

    (405) In the direct current (DC) power supply system, the delta-wound secondaries of the internal transformer in the transformer rectifier (TR) unit are used to provide a more stable

    • Current input.

    • Voltage input.

    • Current output.

    • Voltage output.

    Correct Answer
    A. Current output.
    Explanation
    The delta-wound secondaries of the internal transformer in the transformer rectifier (TR) unit are used to provide a more stable current output. This means that the current output will be constant and not fluctuate, ensuring a steady supply of current to the system.

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  • 15. 

    (405) In the direct current (DC) power supply system, the reverse current relays (RCR) deenergize when the potential at the

    • GEN terminal is greater than the indicator terminal.

    • GEN terminal is less than the battery terminal.

    • GEN terminal is greater than the SW terminal.

    • BAT terminal is less than the SW terminal.

    Correct Answer
    A. GEN terminal is less than the battery terminal.
    Explanation
    The reverse current relays (RCR) in a direct current (DC) power supply system are designed to deenergize when the potential at the GEN terminal is less than the battery terminal. This means that if the potential at the GEN terminal drops below the potential at the battery terminal, the RCR will deenergize. This is an important safety feature to prevent reverse current flow and protect the system from damage.

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  • 16. 

    (406) If the normal battery is supplying direct current (DC) to the battery bus and emergency DC bus, your first step in troubleshooting is to

    • Define the problem.

    • Take meter readings.

    • Know system operation.

    • Perform an operational check.

    Correct Answer
    A. Know system operation.
    Explanation
    Knowing the system operation is the first step in troubleshooting when the normal battery is supplying direct current (DC) to the battery bus and emergency DC bus. This is because understanding how the system is supposed to work will help identify any deviations or abnormalities. By knowing the system operation, one can compare it to the actual behavior and determine if there is a problem. Taking meter readings and performing an operational check can come later in the troubleshooting process once the problem is identified.

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  • 17. 

    (406) If the normal battery will not charge but the standby battery is OK, then you start taking meter readings at the

    • No. 1 transformer rectifier (TR).

    • No. 2 TR.

    • Standby battery relay.

    • Normal battery relay.

    Correct Answer
    A. Normal battery relay.
    Explanation
    If the normal battery is not charging but the standby battery is fine, it indicates that there may be an issue with the normal battery relay. The normal battery relay is responsible for allowing the flow of current to the normal battery for charging. If this relay is faulty or not functioning properly, it could prevent the normal battery from charging. Therefore, it is necessary to start taking meter readings at the normal battery relay to diagnose and troubleshoot the problem.

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  • 18. 

    (407) Which flight control system operates the disconnect clutch in the stabilizer trim actuator assembly?

    • Manual system.

    • Autopilot system.

    • Hydraulic system.

    • Electric power system.

    Correct Answer
    A. Manual system.
    Explanation
    The manual system operates the disconnect clutch in the stabilizer trim actuator assembly. This means that the disconnect clutch can be disengaged and the stabilizer trim actuator can be manually controlled by the pilot. The other options, such as the autopilot system, hydraulic system, and electric power system, do not directly operate the disconnect clutch in the stabilizer trim actuator assembly.

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  • 19. 

    (408) The aircraft write-up states that the leading edge of the stabilizer does not move down when either horizontal stabilizer trim control switch is put to the NOSE UP position. Where is the best place to start taking meter readings?

    • Check for 28 VDC between pins A and H, B and H, and G and H of the actuator connector plug.

    • Check for 115 VAC between pins A and H, B and H, and G and H of the actuator connector plug.

    • Check for 28 VDC at the up-limit switch with either of the horizontal stabilizer trim control switches actuated.

    • Check for 28 VDC at pin F of the actuator connector plug with either of the horizontal stabilizer trim control switches actuated.

    Correct Answer
    A. Check for 28 VDC at pin F of the actuator connector plug with either of the horizontal stabilizer trim control switches actuated.
    Explanation
    The correct answer is to check for 28 VDC at pin F of the actuator connector plug with either of the horizontal stabilizer trim control switches actuated. This is the best place to start taking meter readings because it directly tests the voltage at the actuator connector plug, which is where the issue with the stabilizer not moving down is likely to be located. By checking for 28 VDC at pin F, it can be determined if there is a problem with the voltage supply to the actuator, which could be causing the issue with the stabilizer.

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  • 20. 

    (409) Which component is used as an emergency means of controlling the aileron trim control circuit?

    • Control stick grip trim switch.

    • Aileron trim control switch.

    • Trim selector switch.

    • Auxiliary trim switch.

    Correct Answer
    A. Auxiliary trim switch.
    Explanation
    The auxiliary trim switch is used as an emergency means of controlling the aileron trim control circuit. It acts as a backup switch in case the primary trim switches fail or become inoperable. This switch allows the pilot to manually adjust the aileron trim in case of any emergency or malfunction.

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  • 21. 

    (409) When the stick grip trim selector switch is moved to the left, the position of the aircraft left aileron is

    • Up (left wing up).

    • Up (left wing down).

    • Down (right wing up).

    • Down (right wing down).

    Correct Answer
    A. Up (left wing down).
    Explanation
    When the stick grip trim selector switch is moved to the left, it causes the left aileron of the aircraft to move in the downward direction. This downward movement of the left aileron creates more lift on the left wing, causing it to move down. Therefore, the correct answer is "up (left wing down)."

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  • 22. 

    (410) After you release the stick grip trim selector switch, the trim indicator light

    • Extinguishes.

    • Remains illuminated.

    • Flashes on and off briefly.

    • Remains on throughout the full cycle of the ailerons.

    Correct Answer
    A. Extinguishes.
    Explanation
    After releasing the stick grip trim selector switch, the trim indicator light extinguishes. This indicates that the trim adjustment has been completed and the aircraft is now in a stable trim position.

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  • 23. 

    (410) Before operating the aileron trim system, you must supply power to

    • Both the electrical and hydraulic systems.

    • The electrical system.

    • The hydraulic system.

    • The bleed air system.

    Correct Answer
    A. Both the electrical and hydraulic systems.
    Explanation
    Before operating the aileron trim system, it is necessary to supply power to both the electrical and hydraulic systems. This is because the aileron trim system requires electrical power to operate the trim motor, which adjusts the position of the ailerons. Additionally, hydraulic power is needed to supply the necessary pressure to move the ailerons. Therefore, both systems must be powered in order for the aileron trim system to function correctly.

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  • 24. 

    (410) When you achieve maximum aileron travel, you should see the aileron takeoff trim indicator lights

    • Change from red to green.

    • Turn on.

    • Go out.

    • Flash.

    Correct Answer
    A. Flash.
    Explanation
    When you achieve maximum aileron travel, the aileron takeoff trim indicator lights flash. This indicates that the ailerons have reached their maximum deflection and are now in the correct position for takeoff. The flashing lights serve as a visual confirmation for the pilot that the ailerons are properly set and ready for flight.

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  • 25. 

    (411) The slotted wing flaps are used on heavy aircraft and

    • Extended forward and downward.

    • Form a slot between the flap and the wing.

    • Increases the chamber or curvature of the wing.

    • Lowers the trailing edge to about 40° below its retracted (UP) position.

    Correct Answer
    A. Form a slot between the flap and the wing.
    Explanation
    Slotted wing flaps are used on heavy aircraft to form a slot between the flap and the wing. This slot allows high-energy air from below the wing to flow over the top surface, delaying the separation of airflow and increasing lift. By creating a slot, the flaps increase the chamber or curvature of the wing, which further enhances lift generation. This design also lowers the trailing edge of the wing, creating a downward angle that helps to increase lift and improve aircraft performance.

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  • 26. 

    (412) The three positions for the speedbrake switch are

    • Open, hold, and land.

    • Open, hold, and retract.

    • Open, release, and retract.

    • Actuate, hold, and retract.

    Correct Answer
    A. Open, hold, and retract.
    Explanation
    The correct answer is open, hold, and retract. The speedbrake switch on an aircraft has three positions. The open position allows the speedbrake to deploy fully, increasing drag and slowing down the aircraft. The hold position keeps the speedbrake in its current position, maintaining the desired level of drag. The retract position stows the speedbrake back into its original position, reducing drag and allowing the aircraft to resume normal flight.

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  • 27. 

    (413) After replacing the 43° position switch on the speedbrake system, your next and final step is to

    • Ohms check the switch.

    • Voltage check the switch.

    • Perform an operational check.

    • Turn in all tools and test equipment.

    Correct Answer
    A. Perform an operational check.
    Explanation
    After replacing the 43° position switch on the speedbrake system, the next and final step is to perform an operational check. This is necessary to ensure that the switch is functioning correctly and that the speedbrake system is working as intended. It is important to test the switch in an operational setting to verify its functionality and to make sure that the replacement has been successful. This step helps to ensure the safety and proper functioning of the speedbrake system.

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  • 28. 

    (414) The operation of the air compressor in an engine fuel-air starter system is controlled by

    • The ground crew.

    • A pressure switch.

    • A centrifugal switch.

    • The pilot using an on-and-off switch.

    Correct Answer
    A. A pressure switch.
    Explanation
    The operation of the air compressor in an engine fuel-air starter system is controlled by a pressure switch. A pressure switch is a device that monitors the pressure in a system and activates or deactivates a circuit based on the predetermined pressure level. In this case, the pressure switch is responsible for controlling the operation of the air compressor, which is used to start the engine. When the pressure in the system reaches the desired level, the pressure switch will activate the compressor, and when the pressure drops below a certain threshold, the pressure switch will deactivate the compressor.

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  • 29. 

    (414) When a pneumatic starter reaches maximum speed, the ground circuit to the starter relay is opened by

    • The pilot valve.

    • A pressure switch.

    • Centrifugal switch.

    • The ON-OFF switch in the cockpit.

    Correct Answer
    A. Centrifugal switch.
    Explanation
    The correct answer is centrifugal switch. When a pneumatic starter reaches maximum speed, the centrifugal switch opens the ground circuit to the starter relay. This switch is designed to automatically disconnect the starter motor from the power source once the motor reaches a certain speed. This helps to prevent damage to the starter motor and allows it to disengage once it is no longer needed.

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  • 30. 

    (415) The volts alternating current (VAC) power requirement for operation of an AC ignition system is

    • 115 VAC, 60 hertz.

    • 208 VAC, 60 hertz.

    • 115 VAC, 400 hertz.

    • 208 VAC, 400 hertz.

    Correct Answer
    A. 115 VAC, 400 hertz.
  • 31. 

    (415) Once the voltage goes through the transformer in the direct current (DC) ignition system, it is then applied to the

    • Igniter plug.

    • Vibrator unit.

    • Small generator.

    • Step-up transformer.

    Correct Answer
    A. Igniter plug.
    Explanation
    In a direct current (DC) ignition system, the voltage is first passed through a transformer. After going through the transformer, the voltage is applied to the igniter plug. This means that the igniter plug is the component that receives the voltage and initiates the ignition process. The other options, vibrator unit, small generator, and step-up transformer, are not directly involved in the ignition process and do not receive the voltage from the transformer.

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  • 32. 

    (415) The engine ignition circuit for the B model of C–135 aircraft does not contain

    • A throttle switch.

    • Two ignition units.

    • Two spark igniters.

    • An ignition control-and-start switch.

    Correct Answer
    A. A throttle switch.
    Explanation
    The engine ignition circuit for the B model of C-135 aircraft does not contain a throttle switch. The throttle switch is not a part of the ignition circuit, but rather a component of the fuel system. The ignition circuit is responsible for providing the spark necessary for combustion in the engine, and it consists of two ignition units and two spark igniters. However, the throttle switch is not involved in the ignition process and is not present in the ignition circuit.

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  • 33. 

    (416) The gas turbine compressor (GTC) is stopped manually by turning the control switch to OFF or by pulling the GTC fire emergency handle and causing the

    • Fuel control relay to de-energize.

    • Fuel control relay to energize.

    • GTC fuel relay to de-energize.

    • GTC fuel relay to energize.

    Correct Answer
    A. Fuel control relay to de-energize.
    Explanation
    When the gas turbine compressor (GTC) needs to be stopped, it can be done manually by turning the control switch to OFF or by pulling the GTC fire emergency handle. This action causes the fuel control relay to de-energize, meaning that it stops receiving power. This de-energizing of the fuel control relay results in the GTC fuel relay also being de-energized, which ultimately stops the flow of fuel to the GTC and shuts it down.

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  • 34. 

    (417) What is the last thing you must do before completing a troubleshooting cycle?

    • Repair the defective item.

    • Bench-check any new parts.

    • Perform an operational check.

    • Replace any malfunctioning part.

    Correct Answer
    A. Perform an operational check.
    Explanation
    Before completing a troubleshooting cycle, the last thing you must do is perform an operational check. This is important to ensure that the issue has been resolved and that the system or equipment is functioning properly. By conducting an operational check, you can verify that the troubleshooting steps taken have been effective and that the problem has been successfully resolved. This step helps to prevent any further issues or malfunctions and ensures that the equipment is ready for use.

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  • 35. 

    (418) What type of fuel system valves link the left wing and aft body tanks to the right wing, mid body, and forward body tanks?

    • Crossfeed.

    • Fire shutoff.

    • Interconnect.

    • Fuel-level control.

    Correct Answer
    A. Interconnect.
    Explanation
    The correct answer is Interconnect. Interconnect valves are fuel system valves that link the left wing and aft body tanks to the right wing, mid body, and forward body tanks. These valves allow fuel to be transferred between tanks to maintain balance and ensure a steady fuel supply to the engines.

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  • 36. 

    (418) How does the auxiliary fuel tank indicating system give a no-flow indication?

    • Steady red light.

    • Flashing red light.

    • Steady amber light.

    • Flashing amber light.

    Correct Answer
    A. Flashing amber light.
    Explanation
    The auxiliary fuel tank indicating system gives a no-flow indication through a flashing amber light. This means that there is a problem with the fuel flow in the auxiliary tank. A steady red light typically indicates a more serious issue, such as a complete failure, while a flashing amber light suggests a partial or intermittent problem with the fuel flow.

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  • 37. 

    (419) How many boost pumps are there in main fuel tank No. 1?

    • Two.

    • Three.

    • Four.

    • Five.

    Correct Answer
    A. Four.
    Explanation
    There are four boost pumps in main fuel tank No. 1.

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  • 38. 

    (419) The output in gallons per minute (gpm) of the scavenge pumps is approximately

    • ½ gpm.

    • 1 gpm.

    • 2 gpm.

    • 3 gpm.

    Correct Answer
    A. 2 gpm.
    Explanation
    The scavenge pumps have an output of approximately 2 gallons per minute (gpm).

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  • 39. 

    (420) To begin troubleshooting a fuel pump inoperative writeup; you would know the system, and then

    • Perform an operational check.

    • Limit the malfunction.

    • Take meter readings.

    • Replace a bad pump.

    Correct Answer
    A. Perform an operational check.
    Explanation
    Performing an operational check is the logical next step in troubleshooting a fuel pump that is not working. By conducting this check, one can determine if the fuel pump is receiving power and if it is functioning properly. This step helps to narrow down the possible causes of the issue and can guide further troubleshooting actions. It is a crucial step in the process of identifying and resolving the problem with the fuel pump.

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  • 40. 

    (421) Thermal switches in a fire-warning system are normally connected in

    • Series with each other.

    • Series with the power source and with the warning light.

    • Parallel with the power source and in series with each other.

    • Parallel with each other and in series with the warning light.

    Correct Answer
    A. Parallel with each other and in series with the warning light.
    Explanation
    Thermal switches in a fire-warning system are connected in parallel with each other to ensure that if one switch is triggered, it does not affect the operation of the other switches. However, they are also connected in series with the warning light to ensure that if any of the switches are triggered, the warning light is activated. This configuration allows for multiple switches to detect a fire and activate the warning light simultaneously.

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  • 41. 

    (421) Frequently used in fire warning systems, the fire detector that has a high-nickel steel rod located along the centerline of a stainless steel tube assembly is called

    • A photoconductive cell.

    • An iron fireman switch.

    • A FENWAL® switch.

    • A continuous cable.

    Correct Answer
    A. An iron fireman switch.
    Explanation
    The correct answer is an iron fireman switch. This type of fire detector is frequently used in fire warning systems and consists of a high-nickel steel rod located along the centerline of a stainless steel tube assembly. The iron fireman switch is designed to detect the presence of fire or heat and activate the appropriate alarm or suppression system.

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  • 42. 

    (421) The maximum circuit resistance within a thermocouple circuit is

    • Infinity.

    • 5 ohms.

    • 50 ohms.

    • 500 ohms.

    Correct Answer
    A. 5 ohms.
    Explanation
    The maximum circuit resistance within a thermocouple circuit is 5 ohms. This is because the resistance in the circuit should be kept as low as possible in order to minimize errors in temperature measurement. A higher circuit resistance can introduce additional resistance and lead to inaccuracies in the voltage generated by the thermocouple. Therefore, it is important to keep the circuit resistance below 5 ohms to ensure accurate temperature readings.

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  • 43. 

    (421) Amplifiers used in the photoelectric fire detector system are sensitive only to

    • Sunlight.

    • Light emitted from flashlights.

    • Signals with a frequency between 7 and 60 Hz.

    • Signals with a frequency between 60 and 160 Hz.

    Correct Answer
    A. Signals with a frequency between 7 and 60 Hz.
    Explanation
    The amplifiers used in the photoelectric fire detector system are designed to be sensitive to signals with a frequency between 7 and 60 Hz. This frequency range is specifically chosen because it corresponds to the flickering frequency of a flame. By being sensitive to this frequency range, the amplifier can effectively detect the presence of a flame and trigger the fire alarm system.

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  • 44. 

    (421) The direct current (DC) voltage that is supplied to the lights in a photoelectric circuit is pulsed at a rate of

    • 10 hertz (Hz).

    • 100 Hz.

    • 200 Hz

    • 400 Hz.

    Correct Answer
    A. 10 hertz (Hz).
    Explanation
    The correct answer is 10 hertz (Hz). In a photoelectric circuit, the direct current (DC) voltage supplied to the lights is pulsed at a rate of 10 hertz. This means that the voltage is being turned on and off 10 times per second. This pulsing of the voltage allows for precise control of the lights and is commonly used in applications such as photography or sensing systems.

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  • 45. 

    (421) In a continuous loop fire detection system, the shield of the continuous loop is constructed of

    • Soft iron.

    • Aluminum.

    • Malleable tin.

    • INCONEL®.

    Correct Answer
    A. INCONEL®.
    Explanation
    INCONEL® is the correct answer for the construction of the shield in a continuous loop fire detection system. INCONEL® is a type of nickel-chromium alloy known for its high resistance to heat and corrosion. This makes it an ideal material for use in fire detection systems as it can withstand high temperatures and protect the continuous loop from damage. Soft iron, aluminum, and malleable tin do not possess the same level of heat and corrosion resistance as INCONEL®, making them less suitable for this purpose.

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  • 46. 

    (422) For the master caution lamps in a master caution system to illuminate,

    • Transistor Q1 must remain at the CUTOFF position.

    • Transistor Q2 must remain at the CUTOFF position.

    • Controlled rectifier SCR2 must forward bias transistor Q2.

    • Controlled rectifier SCR2 conducts current to forward bias transistor Q1.

    Correct Answer
    A. Controlled rectifier SCR2 conducts current to forward bias transistor Q1.
    Explanation
    In a master caution system, the master caution lamps illuminate when controlled rectifier SCR2 conducts current to forward bias transistor Q1. This means that the current flows through SCR2, which then allows current to flow through Q1, causing the lamps to light up.

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  • 47. 

    (422) When a fault occurs, the individual caution lamps in the master caution system remain on until

    • The shutter closes.

    • The fault is corrected.

    • The reset circuit is energized.

    • Another system fault is detected.

    Correct Answer
    A. The fault is corrected.
    Explanation
    When a fault occurs, the individual caution lamps in the master caution system remain on until the fault is corrected. This means that once a fault is detected, the caution lamps will continue to stay on until the issue causing the fault is resolved. The lamps serve as a visual indication to the operator that there is a problem, and they will only turn off once the fault has been fixed.

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  • 48. 

    (423) When the cargo and personnel doors close and lock, the door

    • Open relay will energize.

    • Open relay will de-energize.

    • Position relay will energize.

    • Position relay will de-energize.

    Correct Answer
    A. Open relay will de-energize.
    Explanation
    When the cargo and personnel doors close and lock, it indicates that the doors are secure and in the closed position. In this case, the open relay, which is responsible for opening the doors, will de-energize or turn off. This is because there is no need for the doors to remain open once they are closed and locked.

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  • 49. 

    (423) When all systems are configured for flight, the pilot or copilot must press the

    • Aileron roll trim lever.

    • Autopilot engage lever.

    • Hydraulic pitch trim levers.

    • Thrust reverser locked lever.

    Correct Answer
    A. Hydraulic pitch trim levers.
    Explanation
    The correct answer is hydraulic pitch trim levers. When all systems are configured for flight, the pilot or copilot must press the hydraulic pitch trim levers. This is because the hydraulic pitch trim system is responsible for adjusting the aircraft's pitch attitude and maintaining the desired flight path. By pressing the hydraulic pitch trim levers, the pilot or copilot can make necessary adjustments to the aircraft's pitch trim, ensuring stable and controlled flight. The other options, such as the aileron roll trim lever, autopilot engage lever, and thrust reverser locked lever, are not relevant to the process of configuring systems for flight.

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Quiz Review Timeline (Updated): Mar 15, 2023 +

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

  • Current Version
  • Mar 15, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 19, 2013
    Quiz Created by
    Roach187fw

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