2A672 Volume 2 Ure (Aircraft) Questions

80 Questions | Total Attempts: 2584

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2A672 Volume 2 Ure (Aircraft) Questions

A person aiming to become aerospace ground equipment journeyman is charged with diagnosing any malfunctions and repairing the equipment. Before they assign a person to repair the equipment they should ensure that they perform troubleshooting on the equipment. Give the question below on volume two a try before beginning on the next volume.


Questions and Answers
  • 1. 
    During operation of the EPU-6/E frequesncy converter it is determined that E and F pin voltage in not needed for the aircraft.  The operator places the Loop/bypass/28 V to aircraft switch to what position?
    • A. 

      28 V to aircraft

    • B. 

      Neutral

    • C. 

      Bypass

    • D. 

      Loop

  • 2. 
    Which of the following components provides 525 VAC to the control transformer of the EPU-6/E frequency converter?
    • A. 

      Input auto transformer

    • B. 

      Output auto transformer

    • C. 

      Input phase sequence transformer

    • D. 

      Output phase sequence transformer

  • 3. 
    What EPU-6/E components receive potential directly from the input auto transformer?
    • A. 

      Analog board and alarm display

    • B. 

      Control transformer and voltage control

    • C. 

      Input circuit breakers and display power supply

    • D. 

      SCR voltage regulator and phase sequence transformer

  • 4. 
    The control transformer perform on the EPU-6/E frequency converter provides
    • A. 

      28 VDC for the aircraft contactor

    • B. 

      240 VDC for the aircraft contactor

    • C. 

      120 VAC for the operation of E and F line 28 VDC power supply

    • D. 

      240 VAC for operation of E and F line 28 VDC power supply

  • 5. 
    What EPU-6/E frequency converter components must be inspected prior to use?
    • A. 

      Air inlets for blockage

    • B. 

      Wiring for secure mounting

    • C. 

      Maintenance panels for corrosion

    • D. 

      Interior air vents for secure mounting

  • 6. 
    During operation you determine that there is an undervoltage fault problem with the EPU-6/E frequency converter unit.  What component could be malfunctioning?
    • A. 

      Analog board has failed

    • B. 

      Output trim potentiometer is centered

    • C. 

      Voltage control board potentiometer is shorted

    • D. 

      Audible alarm switch is in the silence position

  • 7. 
    During operation of the EPU-6/E frequency converter you determine that one phase voltage is lower than the other two phases.  What could cause this malfunction?
    • A. 

      Malfunctioning transister

    • B. 

      Burnt control transformer fuse

    • C. 

      Improper SCR firing adjustment

    • D. 

      Loose push-on connector on the output filter capacitor

  • 8. 
    What -95 gas turbine compressor section supplies high-volume, low-pressure air for combustion, cooling, and bleed air output?
    • A. 

      Turbine section

    • B. 

      Accessory section

    • C. 

      Compressor section

    • D. 

      Air regulator section

  • 9. 
    The function of the deswirl ring on the -95 gas turbine compressor is to
    • A. 

      Accelerate air

    • B. 

      Increase air pressure

    • C. 

      Decrease air velocity

    • D. 

      Smooth turbulent air flow

  • 10. 
    What -95 component isolates the second-stage air from the operation of the first-stage compressor?
    • A. 

      Interstage ducts

    • B. 

      Interstage seal

    • C. 

      Impellers

    • D. 

      Inducers

  • 11. 
    What prevents overpressurization of the bearing cavity on a -95?
    • A. 

      Oil jet

    • B. 

      Oil cooler

    • C. 

      Scavenge pump

    • D. 

      Oil tank vent line

  • 12. 
    What -95 chambers are pressurized when the butterfly valve is closed?
    • A. 

      1 and 3

    • B. 

      2 and 4

    • C. 

      1, 2, and 3

    • D. 

      1, 3, and 4

  • 13. 
    The -95's rate-metering valve prevents the butterfly valve from snapping open by bleeding air through the atmospheric bleed port from chamber
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 14. 
    What -95 component closes to complete the electrical circuit to the fuel solenoid and ignition unit?
    • A. 

      Load switch

    • B. 

      Oil pressure switch

    • C. 

      Turbine start switch

    • D. 

      35 percent centrifugal speed switch

  • 15. 
    Refer to foldout 2.  The -95 runs up to 60 percent but the battery is not charging.  What is the probable cause of this trouble?
    • A. 

      K4 energized and its contacts closed

    • B. 

      K3 de-energized and its contacts opened

    • C. 

      K4 de-energized and its contacts closed

    • D. 

      K3 de-energized and its contacts did not remain closed

  • 16. 
    Refer to foldout 2.  During an ops check of a -95, you place the air load switch S2 in the ON position.  The butterfly valve starts to open at 95 percent.  What do you check?
    • A. 

      SV2

    • B. 

      S10

    • C. 

      TD2

    • D. 

      K6

  • 17. 
    Refer to foldout 2.  What -95 component energizes SV4?
    • A. 

      Master switch

    • B. 

      Air load valve

    • C. 

      Air load switch

    • D. 

      Oil pressure switch

  • 18. 
    What preliminary set-up step, if skipped, prevents the -95 from starting?
    • A. 

      Set-up controls

    • B. 

      Set parking brakes

    • C. 

      Open and secure the exhaust door

    • D. 

      Ensure the turbine air inlet and exhaust doors are free of obstructions

  • 19. 
    On the -95, discharge air pressure at 100 percent engine speed should indicate
    • A. 

      55 +2 psig

    • B. 

      45 +2 psig

    • C. 

      35 +2 psig

    • D. 

      25 +2 psig

  • 20. 
    Refer to foldout 2.  The -95 engine cranks but does not start.  What is the probable cause of this trouble?
    • A. 

      CB3 s open

    • B. 

      S9 is shorted

    • C. 

      SV1 coil is open

    • D. 

      K7 is not energized

  • 21. 
    The -95 does not shut down when the charging rate decreases to 12 amperes.  What is the probable cause of this trouble?
    • A. 

      Air load switch

    • B. 

      Fuel level relay K5

    • C. 

      2 speed solenoid SV4

    • D. 

      Battery charging module

  • 22. 
    When heat is applied to an ice cube and the ice starts to melt, it is
    • A. 

      Super heat

    • B. 

      Latent heat

    • C. 

      Sensible heat

    • D. 

      Convection heat

  • 23. 
    The three methods of heat transfer are
    • A. 

      Sensible, latent, and super heat

    • B. 

      Sensible, convection, and conduction

    • C. 

      Conduction, convection, and radiation

    • D. 

      Conduction, convection, and super heat

  • 24. 
    The air flowing through an air conditioner is also called
    • A. 

      Heat

    • B. 

      Heat load

    • C. 

      Pounds per minute (ppm)

    • D. 

      Cubic feet per minute (cfm)

  • 25. 
    While you are doing an ops check of an air conditioner, you notice the unit is short cycling.  What do you do to correct this trouble?
    • A. 

      Increase the heat load

    • B. 

      Lower the refrigerant charge

    • C. 

      Check the receiver outlet valve

    • D. 

      Decrease the setting of the LPCO

  • 26. 
    Bubbles in an air conditioner refrigeration system sight glass probably indicate
    • A. 

      Refrigerant overcharge

    • B. 

      A low refrigerant charge

    • C. 

      High discharge temperature

    • D. 

      Low discharge air temperature

  • 27. 
    What MA-3D air conditioner component controls refrigerant flow into the evaporator?
    • A. 

      Quench valve

    • B. 

      TXV solenoid valve

    • C. 

      Hot gas bypass circuit

    • D. 

      Electric expansion valve

  • 28. 
    The temperature controller on an MA-3D air conditioner opens the hot gas bypass valve if the
    • A. 

      Air pressure is too low so the boiling point of the R134a must be increased

    • B. 

      Suction air pressure is too high so the boiling point of the refrigerant can be decreased

    • C. 

      Suction pressure is too low so the boiling point of the refrigerant must be increased to increase the output air temperature

    • D. 

      Suction pressure is too high so the boiling point of the refrigerant must be decreased to decrease the output air temperature

  • 29. 
    You place the MA-3D air conditioner SW1 in the START position, but the engine does not operate.  What is the probable cause of this trouble?
    • A. 

      K7 contacts are closed

    • B. 

      Overspeed switch is closed

    • C. 

      Oil pressure switch is closed

    • D. 

      Override switch is not closed

  • 30. 
    Refer to foldouts 4 and 5.  What relay prevents the MA-3D air conditioner pumpdown light from illuminating in the cool mode?
    • A. 

      K8

    • B. 

      K2

    • C. 

      TC

    • D. 

      S4

  • 31. 
    The engine on the MA-3D air conditioner is operating at 1,250 rpm, but the blower clutch does not engage.  What do you do?
    • A. 

      Replace SW2

    • B. 

      Replace the engine speed control

    • C. 

      Nothing, this is normal operation; the blower clutch energizes at governed speed

    • D. 

      Check the MPU to make sure it's sending the proper signal to the engine speed control

  • 32. 
    What MA-3D air conditioner component provides 24 VAC for operation of the temperature controller?
    • A. 

      Generator (G1)

    • B. 

      Alternator (G2)

    • C. 

      Power monitor relay (PMR)

    • D. 

      Transformer rectifier (TR1)

  • 33. 
    The MA-3D air conditioner radiator fan stops operating.  Where do you start troubleshooting?
    • A. 

      K2

    • B. 

      K4

    • C. 

      G2

    • D. 

      CB2

  • 34. 
    While you are operating on 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
    • A. 

      B7 which steps closed to meter R143a into the evaporator

    • B. 

      B7 which steps open to meter R134a into the evaporator

    • C. 

      The quench valve which opens to aid in cooling

    • D. 

      S1 and S2 which open to aid in cooling

  • 35. 
    What MA-3D air conditioner safety component de-energizes the compressor clutch?
    • A. 

      Low-pressure cutout (LOTO) closing

    • B. 

      Oil pressure cutout (OPCO) closing

    • C. 

      Temperature controller (TC) breaking the circuit to K2

    • D. 

      Suction pressure rising to 5 psi

  • 36. 
    What type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?
    • A. 

      Vacuum leaks

    • B. 

      Inward leaks

    • C. 

      Outward leaks

    • D. 

      Pressure leaks

  • 37. 
    What type of engine starter does the ACE 802S air conditioner use?
    • A. 

      Air

    • B. 

      Manual

    • C. 

      Electric

    • D. 

      Hydraulic

  • 38. 
    What medium is used to lubricate the engine starter on the ACE 802S air conditioner?
    • A. 

      Air

    • B. 

      Oil

    • C. 

      Fuel

    • D. 

      Coolant

  • 39. 
    The compressor switch on the ACE 802S must be held in the HOLD position when engaging the compressor in order to
    • A. 

      Build up oil pressure

    • B. 

      Defrost the evaporator

    • C. 

      Allow the oil and discharge pressures to stabilize

    • D. 

      Ensure the engine is at governed speed before engaging compressor

  • 40. 
    When the ACE 802S compressor is in the HOLD position, what is the compressor displacement?
    • A. 

      Errratic

    • B. 

      Constant

    • C. 

      Minimum

    • D. 

      Maximum

  • 41. 
    What does the heat boost system on the ACE802S air conditioner use to trim output air temperature?
    • A. 

      Air

    • B. 

      Refrigerant

    • C. 

      Engine coolant

    • D. 

      Electric heater

  • 42. 
    What ACE 802S air conditioner components divide the refrigerant system high-pressure side from the low-pressure side?
    • A. 

      Compressor and expansion valve

    • B. 

      Condenser and expansion valve

    • C. 

      Compressor and condenser

    • D. 

      Condenser and evaporator

  • 43. 
    What ACE 802S air conditioner system "supercharges" the compressor?
    • A. 

      Defrost

    • B. 

      Heat boost

    • C. 

      Vapor injection

    • D. 

      Liquid injection

  • 44. 
    What valve must be opened prior to starting the engine on the ACE 802S air conditioner system?
    • A. 

      Air shutoff

    • B. 

      Fuel shutoff

    • C. 

      Coolant control

    • D. 

      Refrigerant control

  • 45. 
    What is the first troubleshooting step that must be accomplished when a unit comes in with a write-up in the forms?
    • A. 

      Perform a service inspection

    • B. 

      Perform an operational check

    • C. 

      Verify the problem actually exists

    • D. 

      Recognize the write-up as a malfunction

  • 46. 
    What power source operates the heater/combustion section of the new generation heater (NGH)?
    • A. 

      12 VDC

    • B. 

      120 VAC

    • C. 

      Hydraulic motor

    • D. 

      Diesel engine only

  • 47. 
    How does the new generation heater (NGH) keep output air temperature within programmed limits?
    • A. 

      Burner control unit (BCU) uses outlet air sensors to compare air temperature with programmed value, cycling the fuel burner on and off to maintain temperature

    • B. 

      Heater control unit (HCU) uses outlet air sensors to compare air temperature with programmed value, cycling the fuel burner on and off to maintain temperature

    • C. 

      A photocell monitors combustion and activates the BCU to cycle the fuel burner on and off to maintain temperature

    • D. 

      An electronic thermostat cycles the main air fan on and off to maintain temperature

  • 48. 
    What adjustment on the new generation heater (NGH) prevents coking in the combustion section?
    • A. 

      Fuel pressure

    • B. 

      Air/fuel ratio

    • C. 

      Igniter timing

    • D. 

      Fuel spray pattern

  • 49. 
    How does the photocell on the new generation heater (NGH) verify the flame in the burner tube?
    • A. 

      The photocell's thermal contacts open when heat increases

    • B. 

      The photocell's thermal contacts close when heat increases

    • C. 

      The photocell's resistance decreases in the presence of light

    • D. 

      The photocell's resistance increases in the presence of light

  • 50. 
    When troubleshooting a defective new generation heater (NGH) charging system, what component do you check first?
    • A. 

      Charge coil

    • B. 

      Alternator G1

    • C. 

      Ignition switch

    • D. 

      Charge regulator

  • 51. 
    What condition causes erratic operation of the MJ-2A-1 hydraulic test stand?
    • A. 

      Air in the system

    • B. 

      Fill relief valve set too low

    • C. 

      Thermal relief valve set too high

    • D. 

      Overserviced hydraulic reservoir

  • 52. 
    The system selector valve on the MJ-2A-1 hydraulic test stand must be placed in the AIRCRAFT position during fill-and-bleed operation in order to
    • A. 

      Relieve pressure from the system

    • B. 

      Force fluid to flow into the reservoir

    • C. 

      Bypass fluid around the gear-type boost pump

    • D. 

      Force fluid to flow into the low-pressure system

  • 53. 
    What MJ-2A-1 hydraulic test stand component prevents thermal expansion of the hydraulic fluid from rupturing a hydraulic line?
    • A. 

      Heat exchanger

    • B. 

      Temperature switch

    • C. 

      Thermal relief valve

    • D. 

      Low-pressure check/relief valve

  • 54. 
    When fluid temperature is below 70 degrees F, what must be accomplished to prevent rupturing the filters on the MJ-2A-1 hydraulic test stand?
    • A. 

      Fill-and-bleed the system

    • B. 

      Adjust the thermal relief valve

    • C. 

      Open the heat exchanger bypass valve

    • D. 

      Close the heat exchanger bypass valve

  • 55. 
    What MJ-2A-1 test stand component must be readjusted any time the high-pressure pump compensator setting is changed?
    • A. 

      High-pressure pump volume control

    • B. 

      High-pressure relief valve

    • C. 

      Thermal relief valve

    • D. 

      Bypass valve

  • 56. 
    What MJ-2A-1 hydraulic test stand component must be open to set the volume output?
    • A. 

      Bypass valve

    • B. 

      System selector valve

    • C. 

      High-pressure relief valve

    • D. 

      Heat exchanger bypass valve

  • 57. 
    What MJ-2A-1 hydraulic test stand engine system safety device sounds the warning horn in the event of an engine system malfunction?
    • A. 

      Water level switch

    • B. 

      Oil pressure switch

    • C. 

      Fuel level indicator

    • D. 

      Fuel pressure switch

  • 58. 
    What MJ-2A-1 hydraulic test stand switch provides an alternate means of energizeng the fill pump when either of the microswitches is defective?
    • A. 

      Fill switch, LS4

    • B. 

      Micro switch, FS1

    • C. 

      Engine master switch

    • D. 

      Soft start relay switch

  • 59. 
    During MJ-2A-1 hydraulic test stand slosed loop operation, the aircraft reservoir began to drain and the operator immediately shuts the unit down to prevent any further fluid loss.  By analyzing the hydraulic flow charts, you determine that the problem is caused by the thermal relief valve being set to
    • A. 

      162 psi

    • B. 

      152 psi

    • C. 

      142 psi

    • D. 

      132 psi

  • 60. 
    The maximum output pressure of the MHU-83C/E lift truck's hydraulic control valves is
    • A. 

      775 psi

    • B. 

      1,500 psi

    • C. 

      1,800 psi

    • D. 

      2,000 psi

  • 61. 
    During a load test of an MHU lift truck, the operator changes the level of the table by changing the position of the
    • A. 

      Longitudinal valve

    • B. 

      Tilt control valve

    • C. 

      Latitudinal valve

    • D. 

      Azimuth valve

  • 62. 
    The MHU lift truck is operating at governed speed, but the directional control lever is stuck.  What is the cause of this trouble?
    • A. 

      Shifter solenoid is energized

    • B. 

      Neutral switch S2 is still open

    • C. 

      Shifter solenoid is de-energized

    • D. 

      Directional lever is out of adjustment

  • 63. 
    During load testing, the table on the MHU lift truck starts to tilt without changing the position on the control valve.  What is the probable cause?
    • A. 

      Tilt cylinder leak

    • B. 

      Azimuth cylinder leak

    • C. 

      Latitudinal cylinder leak

    • D. 

      Longitudinal cylinder leak

  • 64. 
    While lowering the MJ-1B lift truck cradle assembly, you notice one lift arm lowers slower than the other.  What is the probable cause?
    • A. 

      System pump failure

    • B. 

      Overcenter valves out of adjustment

    • C. 

      Counterbalance valve out of adjustment

    • D. 

      Lift arm cylinder relief valve out of adjustment

  • 65. 
    What MJ-1B lift truck cradle movement is manually operated?
    • A. 

      Tilt movement

    • B. 

      Yaw movement

    • C. 

      Lateral movement

    • D. 

      Longitudinal movement

  • 66. 
    What is the probable cause when the MJ-1B lift truck engine does not start?
    • A. 

      10 amp fuse

    • B. 

      20 amp fuse

    • C. 

      Low oil pressure

    • D. 

      Neutral start switch S3 is closed

  • 67. 
    On the split deck maintenance platform, what controls the platform's descent rate?
    • A. 

      Orifice fitting

    • B. 

      Scissor assembly

    • C. 

      Pressure switches

    • D. 

      Two-stage lift cylinders

  • 68. 
    What split deck maintenance platform component establishes the maximum platform elevation?
    • A. 

      Lift cylinders

    • B. 

      Pressure switch

    • C. 

      Sensor rail switch

    • D. 

      Lower scissor wheel travel limit switch

  • 69. 
    On the split deck maintenance platform, how is the platform lowered on the event of electrical failure?
    • A. 

      Battery power operates the electric down valves

    • B. 

      Auxiliary power operates the electric down valves

    • C. 

      Accumulator pressure operates the down pilot check valve

    • D. 

      The weight of the platform and scissor assembly controls descent rate

  • 70. 
    What split deck maintenance platform engine switch position energizes the electric fuel pump, fuel solenoid, and regulator?
    • A. 

      RUN

    • B. 

      MODE

    • C. 

      START

    • D. 

      DRIVE

  • 71. 
    While operating the split deck maintenance platform you realize that the platform will not lower.  What is the probable cause?
    • A. 

      Corroded battery cables

    • B. 

      A defective control cable

    • C. 

      Main disconnect switch ON

    • D. 

      Engine switch in RUN position

  • 72. 
    On the SGNSC, the auxiliary air system
    • A. 

      Powers the booster compressor

    • B. 

      Provides air to the feed air compressor

    • C. 

      Provides low pressure air for pneumatic tools

    • D. 

      Maintains 130 degreees F air temperature to prevent condensation

  • 73. 
    What SGNSC components separate the nitrogen from the oxygen?
    • A. 

      ASM1, ASM2

    • B. 

      CYL1, CYL2

    • C. 

      FCV1, FCV2

    • D. 

      PS1, TS4, TS5

  • 74. 
    What causes the starter solenoid on the SGNSC to disengage during normal operation?
    • A. 

      Alternator output

    • B. 

      Oil pressure switch

    • C. 

      Ignition switch released

    • D. 

      Centrifugal switch opens

  • 75. 
    What SGNSC component determines the speed of the nitrogen booster compressor?
    • A. 

      Engine

    • B. 

      End of stroke limit switch

    • C. 

      Programmable logic controller circuit

    • D. 

      Directional control valve cycling control relay

  • 76. 
    During SGNSC operation, the HM2 fails to operate.  What terminal connection of SW3 could be bad?
    • A. 

      Terminal 1

    • B. 

      Terminal 3

    • C. 

      Terminal 4

    • D. 

      Terminal 6

  • 77. 
    A supervisor must document an NCO's safety training on AF Form
    • A. 

      2426

    • B. 

      623

    • C. 

      457

    • D. 

      55

  • 78. 
    Which form is used to report a hazardous condition?
    • A. 

      AFTO Form 375

    • B. 

      AF Form 457

    • C. 

      AF Form 455

    • D. 

      AF Form 55

  • 79. 
    Who determines the length of time it is considered economically feasible to repair a piece of equipment?
    • A. 

      Supervisor

    • B. 

      Installation commander

    • C. 

      Uniform repair/replacement board

    • D. 

      Item manager and equipment specialist

  • 80. 
    The maintenance organization submits the AFTO Form 375 to
    • A. 

      MAJCOM HQ

    • B. 

      The item manager

    • C. 

      The equipment specialist

    • D. 

      The uniform repair/replacement board