2A652 (Age Journeyman) Volume 4, Edit Code 6
In the air force it is important for the equipment used by the pilots and soldiers to be properly maintained. This is done by someone with proper knowledge of the ground equipments. The quiz below will take you through volume four and help you in your revision. Give it a shot.
- 1.(601) 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 gauge reads COOL.
- D.
The inside temperature reaches 140 degrees Fahrenheit (°F).
- 2.(602) When should starting aids be used to start the New Generation Heater (NGH)?
- A.
When the temperature gauge reads COOL.
- B.
Never, as it will result in serious engine damage.
- C.
When ambient temperature is below 32 degrees Fahrenheit (°F).
- D.
During the engine start up with the ignition switch in PREHEAT position.
- 3.(602) 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 (°F).
- 4.(603) 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.(604) 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.(604) Heat added to a gas is
- A.
Sensible heat.
- B.
Specific heat.
- C.
Super heat.
- D.
Latent heat.
- 7.(605) A good refrigerant 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.(606) 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.(606) Refrigerant 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.(606) 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.(606) On the MA–3D air conditioner, which component shuts off the compressor when suction pressure drops below 5 pounds of pressure?
- A.
Low pressure cutout.
- B.
Temperature controller.
- C.
Pressure control cutout.
- D.
Compressor pump down overload.
- 12.(607) 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.(607) 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.(607) Refrigerant is always removed through the
- A.
Purge valve.
- B.
Receiver inlet valve.
- C.
Receiver outlet valve.
- D.
Discharge service valve.
- 15.(608) 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.(608) Which A/M32C–10D air conditioner component extracts energy from bleed air on the air cycle machine?
- A.
Compressor.
- B.
Heat exchanger.
- C.
Expansion turbine.
- D.
Temperature controller.
- 17.(609) 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.
Build-up oil pressure.
- 18.(609) 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.(609) Which medium does the ACE 802S air conditioner heat boost system use to trim output air temperature?
- A.
Air.
- B.
Refrigerant.
- C.
Electric heater.
- D.
Engine coolant.
- 20.(609) Which action occurs in the ACE 802S air conditioner evaporator?
- A.
Condensing refrigerant 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.(610) 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.(610) 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.(611) 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 malfunction.
- 24.(611) 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. Please
- 25.(612) 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.
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