Electricity Practice Quiz

74 Questions

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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

  • 26. 
    After flap actuator jackscrews have reached the fully retracted position, what stops the rotation of the flap lock motor?
    • A. 

      Drive shafts

    • B. 

      Flap lock screws

    • C. 

      Flap power down relay

    • D. 

      Motor retract limit switch

  • 27. 
    If the speedbrakes are fully open and the landing gear is down and locked while the aircraft is in flight, the speedbrakes will be?
    • A. 

      Fully extended

    • B. 

      Fully retracted

    • C. 

      Limited to 43 degrees

    • D. 

      Limited to 60 degrees

  • 28. 
    What is used to minimize the initial torque shock to the drive coupling at the beginning of fuel-air operation?
    • A. 

      Slip-type clutch

    • B. 

      Hydraulic clutch

    • C. 

      Pneumatic shock

    • D. 

      Sprag-type clutch

  • 29. 
    When a pneumatic starter reaches maximum speed, the ground circuit to the starter relay is opened by?
    • A. 

      The pilot valve

    • B. 

      A pressure switch

    • C. 

      Centrifugal switch

    • D. 

      The ON-OFF switch in the cockpit

  • 30. 
    What happens to the air in a pneumatic started system when the regulating-and-shutoff valve closes?
    • A. 

      Vented overboard

    • B. 

      Channeled into the starter

    • C. 

      Exhausted by the valve actuator

    • D. 

      Routed through the valve-regulator

  • 31. 
    The alternating current voltage power requirement for operation of an AC ignition system is?
    • A. 

      115 VAC, 60 Hz

    • B. 

      208 VAC, 60 Hz

    • C. 

      115 VAC, 400 Hz

    • D. 

      208 VAC, 400 Hz

  • 32. 
    In a direct current ignition system, what component changes the direct current into a pulsating current?
    • A. 

      Magnet

    • B. 

      Vibrating unit

    • C. 

      Small generator

    • D. 

      Step-up transformer

  • 33. 
    If the engine starter system is operating properly but the aircraft engine will not start, what components are working properly?
    • A. 

      Centrifugal switches

    • B. 

      Step-up transformers

    • C. 

      Aircraft wiring

    • D. 

      Igniter plugs

  • 34. 
    If the gas turbine compressor does not start, but the start light comes on and stays on when the control switch is placed to the START and RUN positions, what do you check first?
    • A. 

      Starter fuse

    • B. 

      Starter relay

    • C. 

      Control switch

    • D. 

      Ignition hold relay

  • 35. 
    What type of fuel system valves link the left wing and aft body tanks to the right wing, mid body, and forward body tranks?
    • A. 

      Crossfeed

    • B. 

      Fire shutoff

    • C. 

      Interconnect

    • D. 

      Fuel-level control

  • 36. 
    How does the auxiliary fuel tank indicating system give a no-flow indication?
    • A. 

      Steady red light

    • B. 

      Flashing red light

    • C. 

      Steady amber light

    • D. 

      Flashing amber light

  • 37. 
    You can check the fuel boost pumps in the fuel control system by?
    • A. 

      Pulling and resetting the pump circuit breaker

    • B. 

      Depressing a pressure switch

    • C. 

      Measuring fuel-flow

    • D. 

      Using a multimeter

  • 38. 
    The green band on the main fuel tank fuel-quantity indicator
    • A. 

      Calibrates the main tank fuel-indicator

    • B. 

      Gives an indication of boost pump pressure

    • C. 

      Indicates when the gauge needs to be replaced

    • D. 

      Indicates where the safe-level switfhes open the electrical circuit

  • 39. 
    How many boost pumps are there in main fuel tank No. 1?
    • A. 

      Two

    • B. 

      Three

    • C. 

      Four

    • D. 

      Five

  • 40. 
    When the aft body fuel tank is supplying fuel to the aircraft engines and the fuel level becomes too low, what signal is given to warn the crew?
    • A. 

      A warning horn sounds

    • B. 

      The dome lights come on bright

    • C. 

      An audible fuel-low warning sounds

    • D. 

      The amber light next to the fuel-quantity indicator flashes

  • 41. 
    The output in gallons per minute of the scavenge pumps is approximately?
    • A. 

      1/2 gpm

    • B. 

      1 gpm

    • C. 

      2 gpm

    • D. 

      3 gpm

  • 42. 
    If an ohmeter reading from case ground to one phase of the fuel boost pump indicates infinity. this indicates?
    • A. 

      Two phases shorted together

    • B. 

      A dead short in the circuit

    • C. 

      An open in the circuit

    • D. 

      A normal reading

  • 43. 
    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. 

      A photocunductive cell

    • B. 

      An iron fireman switch

    • C. 

      A FENWAL switch

    • D. 

      A continuous switch

  • 44. 
    The maximum circuit resistance within a thermocouple circuit is?
    • A. 

      5 ohms

    • B. 

      50 ohms

    • C. 

      500 ohms

    • D. 

      Infinity

  • 45. 
    Amplifiers used in the photoelectric fire detector system are sensitive only?
    • A. 

      Sunlight

    • B. 

      Light emitted from flashlights

    • C. 

      Signals with a frequency between 7 to 60 Hz

    • D. 

      Signals with a frequency between 60 to 160 Hz

  • 46. 
    The direct current voltage that is supplied to the lights in a photoelectric circuit is pulsed at a rate of?
    • A. 

      10 Hz

    • B. 

      100 Hz

    • C. 

      200 Hz

    • D. 

      400 Hz

  • 47. 
    In a continuous loop fire detection system, the shield of the continuous loop is constructed of?
    • A. 

      Soft iron

    • B. 

      Aluminum

    • C. 

      Malleable tin

    • D. 

      INCONEL

  • 48. 
    The first step you take when troubleshooting the master caution system is to?
    • A. 

      Analyze the problem

    • B. 

      Start voltage checks

    • C. 

      Start continuity checks

    • D. 

      Perform an operational check

  • 49. 
    When the cargo and personnel doors close and lock, the door-
    • A. 

      Open relay will energize

    • B. 

      Open relay will deenergize

    • C. 

      Position relay will energize

    • D. 

      Position relay will deenergize

  • 50. 
    When all systems are configured for flight, the pilot or copilot must press the?
    • A. 

      Aileron roll trim lever

    • B. 

      Autopilot engage lever

    • C. 

      Hydraulic pitch trim levers

    • D. 

      Thrust reverser locked lever

  • 51. 
    After an operational check confirms that the takeoff light does not illuminate, you would first check the?
    • A. 

      Wiring and relays

    • B. 

      Wiring and circuit breakers

    • C. 

      Takeoff lightbulbs and wiring

    • D. 

      Takeoff lightbulbs and circuit breakers

  • 52. 
    The data bus component that coordinates the flow of information on the data bus is the?
    • A. 

      Data bus controller

    • B. 

      Parallel data bus

    • C. 

      Remote terminal

    • D. 

      Serial data bus

  • 53. 
    What is the maximum number of remote terminals that can be connected on any single Data Bus?
    • A. 

      20

    • B. 

      22

    • C. 

      30

    • D. 

      32

  • 54. 
    What components in the landing gear system initiate a signal that identifies the landing gear position at any given time?
    • A. 

      Limit switches

    • B. 

      Touchdown relays

    • C. 

      Control handle solenoids

    • D. 

      Up-lock and down-lock cylinder sending units

  • 55. 
    Placing the landing gear control handle in the up position provides 28 VDC from the?
    • A. 

      Emergency DC bus

    • B. 

      Right main DC bus

    • C. 

      Essential DC bus

    • D. 

      Isolated DC bus

  • 56. 
    If the warning horn indicates that the landing gear is not down and locked, the
    • A. 

      Wing flaps are not adequately extended

    • B. 

      Throttle exceeds minimum cruise power

    • C. 

      Warning light circuit is grounded through the LG selector valve

    • D. 

      Warning light circuit completes circuit through the press-to-test ground

  • 57. 
    In the Mark II antiskid circuit, the component that translates a change of frequency into control signals is the?
    • A. 

      Transducer

    • B. 

      Control shield

    • C. 

      Bias modulator

    • D. 

      Wheel generator

  • 58. 
    During an operational check on the anitskid system, if you discover that the antiskid inoperative light is not working when the system is turned off, you would check?
    • A. 

      Wiring

    • B. 

      Lightbulb

    • C. 

      Control shield

    • D. 

      Wheen generator

  • 59. 
    A signal to the steering control box that indicates the position of the hydraulic linear actuator is provided by the?
    • A. 

      Rudder pedals

    • B. 

      Nose gear indicator

    • C. 

      Main potentiometer

    • D. 

      Follow-up potentiometer

  • 60. 
    What component in the nosewheel steering system provides a quick-disconnect capability for turning the nose wheel beyond the steerable range?
    • A. 

      Scissors assembly

    • B. 

      Steer control valve

    • C. 

      Hydraulic linear actuator

    • D. 

      NWS A/R DISC MSL step switch

  • 61. 
    When the nosewheel steering shutoff valve is energized, hydraulic pressure is applied to the?
    • A. 

      Steering actuator

    • B. 

      Steering control box

    • C. 

      Command potentiometer

    • D. 

      Right and left steering control valve

  • 62. 
    The 28 VDC from main DC bus No.1 to the rudder pedal nose steering select valve coil is controlled by the?
    • A. 

      Rudder pedal steering control relay

    • B. 

      Nose landing gear steering actuator

    • C. 

      Rudder pedal steering actuator

    • D. 

      Wheel rotation detector relay

  • 63. 
    For the wheel rotation detector control relays to energize, wheel speed in revolution per minute must be at lease?
    • A. 

      425 rpm

    • B. 

      450 rpm

    • C. 

      475 rpm

    • D. 

      500 rpm

  • 64. 
    Where should you first take ohmmeter readings if the nosewheel steering(NWS)  fail light illuminates?
    • A. 

      Command and feedback potentiometers

    • B. 

      Weight on wheels switch

    • C. 

      Contact B1 of relay K1

    • D. 

      Steering control box

  • 65. 
    What is used to dim aircraft interior console lights?
    • A. 

      Variable resistors

    • B. 

      Variable transformers

    • C. 

      Switching lights in series

    • D. 

      Switching network of resistors

  • 66. 
    Which relay or relays must be energized before the anti-collision light will come on?
    • A. 

      Flasher

    • B. 

      Anti-collision

    • C. 

      Both flasher and anti-collision

    • D. 

      Both anti-collision and landing light

  • 67. 
    What type of power is stepped up by the strobe light power supply to act as the "trigger" voltage for the strobe anti-collision lights?
    • A. 

      115 VAC

    • B. 

      115 VDC

    • C. 

      14 VAC

    • D. 

      28 VDC

  • 68. 
    How many pulses per minute does the strobe light power supply provide the "trigger" voltage to the strobe anti-collision lights?
    • A. 

      40 to 50

    • B. 

      50 to 60

    • C. 

      60 to 70

    • D. 

      70 to 80

  • 69. 
    The first step in troubleshooting a malfunction in an aircraft lighting system is to?
    • A. 

      Obtain a job number

    • B. 

      Repair the malfunction

    • C. 

      Analyze the malfunction

    • D. 

      Obtain tools to repair the malfunction

  • 70. 
    While troubleshooting an inoperative taxi light, if you check for 28 VAC on terminal A2 of the taxi light relay and find 0 VAC, the most probable cause for this problem is an open?
    • A. 

      Taxi light

    • B. 

      Taxi light relay

    • C. 

      Taxi light ground wire

    • D. 

      Wire between relay and taxi light

  • 71. 
    Which ramp and cargo door system component completes the circuit to the ramp control valve?
    • A. 

      Position switches

    • B. 

      Ramp down unlock relay

    • C. 

      Door and ramp control switch

    • D. 

      Locking cylinder unlocked switch

  • 72. 
    The position switches provide voltage to the locked solenoid of the ramp up-lock control valve when the?
    • A. 

      Door is in the fully up position

    • B. 

      Ramp is in the fully up position

    • C. 

      Door is in the fully down position

    • D. 

      Ramp is in the fully down position

  • 73. 
    The left-hand and right-hand position switches in the ramp and cargo door system supply power to the ramp up-lock control valve during?
    • A. 

      Closing of the door

    • B. 

      Closing of the ramp

    • C. 

      Opening of the door

    • D. 

      Opening of the ramp

  • 74. 
    What happens if the pilot uses the ramp and cargo door switch while the aircraft is in flight?
    • A. 

      Ramp opens first

    • B. 

      Door opens first

    • C. 

      Ramp and door open at the same time

    • D. 

      The door will open but the ramp will remain closed