2a6x2 CDC Vol 4

89 Questions | Total Attempts: 109

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CDC Quizzes & Trivia

Questions and Answers
  • 1. 
    The heater control unit (HCU) on the New Generation Heater (NGH) starts the main air fan for output air when 
    • A. 

      A heat setting is selected

    • B. 

      A constant flame is established

    • C. 

      The temperature guage reads COOL

    • D. 

      The inside temperature reaches 140 degrees Fahrenheit

  • 2. 
    When should starting aids be used to start the New Generation Heater (NGH)?
    • A. 

      When the temperature guage reads COOL

    • B. 

      Never, as it will result in serious engine damage

    • C. 

      When ambient temperature is below 32 degrees Fahrenheit

    • D. 

      During the engine startup with the ignition switch in PREHEAT position

  • 3. 
    When operating the New Generation Heater (NGH), turn the heat control switch to the desired position after
    • A. 

      Ample warm up time

    • B. 

      A minimum of 45 seconds

    • C. 

      System voltage indicates 120 volts alternating current (VAC)

    • D. 

      The inside chamber temperature reaches 140 degrees fahrenheit

  • 4. 
    Repair of ground heater equipment should never be attempted 
    • A. 

      Without first talking with the operator

    • B. 

      Without first consulting your supervisor

    • C. 

      Unless accurate technical data is available

    • D. 

      Unless in the presence of an experienced mechanic

  • 5. 
    Heat that can be felt and added or subtracted to a substance without changing its state is called 
    • A. 

      Super heat

    • B. 

      Latent heat

    • C. 

      Specific heat

    • D. 

      Sensible heat

  • 6. 
    Heat added to a gas is 
    • A. 

      Sensible heat

    • B. 

      Specific heat

    • C. 

      Super heat

    • D. 

      Latent heat

  • 7. 
    A good refirgerant will 
    • A. 

      Operate in moderate to high pressure

    • B. 

      Operate in low to moderate pressure

    • C. 

      Be semi-corrosive to metals

    • D. 

      Have a high boiling point

  • 8. 
    Which MA-3D air conditioner control switch allows the operator to control the overall volume of air leaving the unit?
    • A. 

      Blower

    • B. 

      Airflow

    • C. 

      Evaporator

    • D. 

      Temperature

  • 9. 
    Refirgerant leaving the evaporator coil, in the MA-3D air conditioner, is a 
    • A. 

      Low pressure gas

    • B. 

      High pressure gas

    • C. 

      Low pressure liquid

    • D. 

      High pressure liquid

  • 10. 
    When starting the MA-3D air conditioner, hold the safety override switch until 
    • A. 

      30 pounds of oil pressure is reached on the engine oil pressure gauge.

    • B. 

      The start switch is released

    • C. 

      The engine warms up

    • D. 

      The engine starts

  • 11. 
    On the MA-3D air conditioner, which component shuts off the compressor when suction pressure drops below 5 pounds of pressure?
    • A. 

      Low pressure cut out

    • B. 

      Temperature controller

    • C. 

      Pressure control cutout

    • D. 

      Compressor pump down overload

  • 12. 
    Which type of refrigeration system leak occurs when the pressure within the system is less than atmospheric pressure?
    • A. 

      Inward

    • B. 

      Vacuum

    • C. 

      Pressure

    • D. 

      Outward

  • 13. 
    A refrigerant reclaimer is used to 
    • A. 

      Remove refrigerant

    • B. 

      Remove and store refrigerant

    • C. 

      Remove refrigerant and separate acids from the refrigerant

    • D. 

      Remove and store refrigerant and separate oil and acids from the refrigerant

  • 14. 
    Refrigerant is always removed through the 
    • A. 

      Purge valve

    • B. 

      Receiver inlet valve

    • C. 

      Receiver outlet valve

    • D. 

      Discharge service valve

  • 15. 
    An A/M32C-10D air conditioner air cycle machine consists of 
    • A. 

      An air compressor fan only

    • B. 

      An expansion turbine only

    • C. 

      A heat exchanger and an expansion turbine

    • D. 

      An expansion turbine and a compressor fan

  • 16. 
    Which A/M32C-10D airconditioner component extracts energy from bleed air on the air cycle machine?
    • A. 

      Compressor

    • B. 

      Heat Exchanger

    • C. 

      Expansion turbine

    • D. 

      Temperatur controller

  • 17. 
    The ACE 802S air conditioner compressor switch must be held in the HOLD position when engaging the compressor in order to
    • A. 

      Ensure the engine is at governed speed before engaging compressor

    • B. 

      Allow compressor oil and discharge pressures to stabilize

    • C. 

      Defrost the evaporator

    • D. 

      Buildup oil pressure

  • 18. 
    Which is the compressor displacement when the ACE 802S air conditioner compressor is in the HOLD  position?
    • A. 

      Maximum

    • B. 

      Minimum

    • C. 

      Constant

    • D. 

      Erradic

  • 19. 
    Which medium does the ACE 802S airconditioner heat boost system use to trim output air temperature?
    • A. 

      Air

    • B. 

      Refrigerant

    • C. 

      Electric heater

    • D. 

      Engine Coolant

  • 20. 
    Which action occurs in the ACE 802A air conditioner evaporator? 
    • A. 

      Condensiong refirgerant Absorbs heat from the air stream

    • B. 

      Boiling refrigerant absorbs heat from the air stream

    • C. 

      Condensing refrigerant looses heat to the air stream

    • D. 

      Boiling refrigerant looses heat to the air stream

  • 21. 
    Which valve must be opened prior to starting the ACE 802S air conditioner engine?
    • A. 

      Air shutoff

    • B. 

      Fuel shutoff

    • C. 

      Coolant control

    • D. 

      Refrigerant flow

  • 22. 
    Which must be accomplished to avoid damage prior to operating the ACE 802S air conditioner in the HEATING mode after COOLING mode operation?
    • A. 

      Permit refrigerant pressure to equalize

    • B. 

      Perform maximum refrigerant pump down

    • C. 

      Place heating/cooling switch in HEATING position

    • D. 

      Place the reversing valve lever in the HEATING position

  • 23. 
    In troubleshooting, which is the first step that must be completed when a unit comes in with a write-up?
    • A. 

      Isolate the problem

    • B. 

      Perform a service inspection

    • C. 

      Perform an operational check

    • D. 

      Recognize the write-up as a problem

  • 24. 
    How can a restriction in a refrigerant system be identified?
    • A. 

      Sweating at the outlet of a component

    • B. 

      Frosting at the outlet of a component

    • C. 

      Abnormal compressor noise

    • D. 

      Increased suction pressure

  • 25. 
    On a basic rotary compressor, which prevents air from leaving the discharge port while the intake port is taking air in?
    • A. 

      Sliding barrier

    • B. 

      Rotating barrier

    • C. 

      Discharge valve

    • D. 

      Stationary barrier