Electricity Practice Quiz

74 Questions | Total Attempts: 964

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Electricity Quizzes & Trivia

5 lvl test


Questions and Answers
  • 1. 
    The constand speed drive (CSD) that is used to drive a 60/80 Kilo Volts Amperes(kVA) generator has a revolutions per minutes (rpm) output of approximately?
    • A. 

      4,000 rpm

    • B. 

      6,000 rpm

    • C. 

      8,000 rpm

    • D. 

      10,000 rpm

  • 2. 
    The underspeed switch on the 60/80 kVA generator contstand speed drive actuates at?
    • A. 

      325 Hz

    • B. 

      345 Hz

    • C. 

      365 Hz

    • D. 

      395 Hz

  • 3. 
    In an alternating current power supply system, the component that controls load division during parallel generator operation is the?
    • A. 

      Load controller

    • B. 

      Underspeed switch

    • C. 

      Constant speed drive

    • D. 

      Generator control unit

  • 4. 
    What circuit in the generator control unit in an alternating current power supply system isolates shorted or open generator phase leads?
    • A. 

      Reactive biasing

    • B. 

      Voltage regulator

    • C. 

      Neutral current-sensing

    • D. 

      Unbalanced current-sensing

  • 5. 
    At what alternating current voltage range does the generator control unit in an AC power supply system maintain generator output?
    • A. 

      135(+ or - 3) VAC

    • B. 

      125( + or -3) VAC

    • C. 

      115(+ or -2) VAC

    • D. 

      105(+ or -2) VAC

  • 6. 
    In an alternating current power supply system, what component connects the 115/200 alternating current voltage main generator output to the main power buses?
    • A. 

      Bus tie lockout

    • B. 

      Bus tie contactor

    • C. 

      Generator control unit

    • D. 

      Generator line contactor

  • 7. 
    What could cause the GEN OUT light to stay on?
    • A. 

      Bus tie switch

    • B. 

      Bus tie contactor

    • C. 

      Open GEN OUT light

    • D. 

      Generator control switch

  • 8. 
    If the No. 1 generator will not come on-line and the voltmeter readings are 28 VDC at the generator control switch, 28 VDC at the input to the generator line contactor coil, and 28 VDC at the ground of the generator line contactor, the most likely cause is?
    • A. 

      An open GLC coil

    • B. 

      A shorted GLC coil

    • C. 

      An open GLC ground

    • D. 

      A shorted GLC ground

  • 9. 
    Which emergency alternating current power system component prevents the emergency generator from dropping off-line when the aircraft lands?
    • A. 

      Emergency power disconnect relay

    • B. 

      Emergency power interlock relay

    • C. 

      Emergency generator test switch

    • D. 

      Power fail relay

  • 10. 
    What is the minimum alternating current voltage requirement to energize the Emergency Power Disconnect Relay?
    • A. 

      90 VAC from A phase

    • B. 

      90 VAC from C phase

    • C. 

      93 VAC from A phase

    • D. 

      93 VAC from C phase

  • 11. 
    The auxiliary source selected to power the tie bus in the auxiliary power unit is determined by the?
    • A. 

      Lockout relay

    • B. 

      Bus protection panel

    • C. 

      APU/external power contactor

    • D. 

      APU external power disconnect contactor

  • 12. 
    The output of the auxiliary power unit generator is maintained at a constant level?
    • A. 

      By varying APU speed

    • B. 

      By controlling the APU fuel-flow

    • C. 

      With the main engine throttles

    • D. 

      With the protection circuits in the generator control unit

  • 13. 
    When troubleshooting a problem(ex. external power will not come on-line and the READY light is not on), the first thing you should do is?
    • A. 

      Do an operational check to verify the problem

    • B. 

      Check for continuity on the external power unit

    • C. 

      Replace the external power unit

    • D. 

      Take voltage readings

  • 14. 
    On the external power system, when the ohmeter shows an infinity reading on an external power receptacle, between the points where control voltage leaves the bus protection panel and returns,
    • A. 

      The external power unit is operating properly

    • B. 

      The external power unit is not operating at all

    • C. 

      There is continuity in the loop

    • D. 

      There is an open in the loop

  • 15. 
    In the direct current power supply, the delta-wound secondaries of the internal transformer in the transformer rectifier unit are used to provide a more stable?
    • A. 

      Current input

    • B. 

      Voltage input

    • C. 

      Current output

    • D. 

      Voltage output

  • 16. 
    During normal operation, the reverse current relays, in a direct current power supply system, receive power from the?
    • A. 

      Transformer rectifier units

    • B. 

      Emergency DC bus

    • C. 

      Battery bus

    • D. 

      Battery

  • 17. 
    What is the cause of a normal battery not charging, when the direct current power supply system is operating and the battery switch is in the NORMAL position?
    • A. 

      No. 1 transformer rectifier unit inoperable

    • B. 

      No. 2 TR unit inoperable

    • C. 

      Open standby battery relay

    • D. 

      Open normal battery relay

  • 18. 
    Which stabilizer trim system switch can be used to shut off the stabilizer trim system?
    • A. 

      Stabilizer trim control relay

    • B. 

      Stabilizer trim cutout switch

    • C. 

      Stabilizer trim nose down-limit switch

    • D. 

      Pilots or co-pilots trim control switch

  • 19. 
    Excessive wear of the ball detent clutch in the stabilizer trim actuator assembly most likely occurs when?
    • A. 

      There is not enough lubrication

    • B. 

      There is no observer in the tail compartment

    • C. 

      The pilot and copilot trim switches are actuated in opposite direction

    • D. 

      The jackscrew is allowed to extend to the maximum travel while the aircraft is on the ground

  • 20. 
    The aircraft write-up states that there is no trim action from either the pilots or co-pilots stabilizer trim control switch. You troubleshoot the problem and find voltage and ground at the stabilizer trim actuator. The most probable cause of this problem is the stabilizer trim
    • A. 

      Actuator

    • B. 

      Safety relay

    • C. 

      Cutout switch

    • D. 

      Control switch

  • 21. 
    What component is used as an emergency means of controlling the aileron trim control?
    • A. 

      Control stick grip trim switch

    • B. 

      Aileron trim control switch

    • C. 

      Trim selector switch

    • D. 

      Auxiliary trim switch

  • 22. 
    Takeoff trim indicator lights are used to?
    • A. 

      Indicate that the ailerons must be trimmed

    • B. 

      Indicate when the ailerons are in the takeoff position

    • C. 

      Warn the pilot when the aircraft is out of flight formation

    • D. 

      Prevent feedback current from passing to the deenergized side of the circuit

  • 23. 
    When the stick grip trim selector switch is moved to the left, the position of the aircraft left aileron is?
    • A. 

      Up (left wing up)

    • B. 

      Up (left wing down)

    • C. 

      Down (right wing up)

    • D. 

      Down (right wing down)

  • 24. 
    After the stick grip trim selector switch is released, the trim indicator light?
    • A. 

      Extinguishes

    • B. 

      Remains illuminated

    • C. 

      Flashes on and off briefly

    • D. 

      Remains on throughout the full cycle of the ailerons

  • 25. 
    The two types of wing flaps used on heavy aircraft are?
    • A. 

      Solid and Fowler

    • B. 

      Slotted and Fowler

    • C. 

      Solid and retractable

    • D. 

      Slotted and retractable