2A652 Volume 4 CDC Pretest
- 1.What component on the New Generation Heater activates the heater control unit(HCU)?
- A.
Heat control switch
- B.
Burner control unit
- C.
Thermostatic sensor
- D.
Oil pressure switch
- 2.When does the heater control unit (HCU) on the New Generation Heater start the main air fan for output air?
- A.
When a heat setting is selected
- B.
Once constant flame is established
- C.
When the temperature gauge reads COOL
- D.
When the inside temperature reaches 140 F
- 3.When should you use starting aids to start the New Generation Heater?
- A.
Never
- B.
Occasionally
- C.
When the temperature gauge reads COOL
- D.
When ambient temperature is below 32 F
- 4.When operating the New Generation Heater, turn the heat control switch to the desired position after
- A.
Ample warm-up time
- B.
A minimum of 45 seconds
- C.
System voltage rises to 120 VAC
- D.
The inside temperature reaches 140 F
- 5.If you need to find out how to perform any maintenance required during an inspection, you should refer to the
- A.
-1 TO
- B.
PE workcards
- C.
Methods and procedures TO
- D.
Service inspection workcards
- 6.The type of inspection that requires the most tear down of specific components is the
- A.
Daily inspection
- B.
Service inspection
- C.
Special inspection
- D.
Periodic inspection
- 7.The first step of troubleshooting heater equipment is
- A.
Analysis
- B.
Isolation
- C.
Recognition
- D.
Verification
- 8.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
- 9.The amount of heat required to raise the temperature of one pound of a substance one degree Faharenheit is known as
- A.
Super heat
- B.
Laten heat
- C.
BTU
- D.
Sensible heat
- 10.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
- 11.The heat that changes the state of a substance, yet does not affect the temperature is called
- A.
Super heat
- B.
Latent heat
- C.
Specific heat
- D.
Sensible heat
- 12.Heat added to a gaseous substance is known as
- A.
Super heat
- B.
Latent heat
- C.
Specific heat
- D.
Sensible heat
- 13.A good refigerant would
- A.
Operate with low pressure
- B.
Have a low boiling point
- C.
Not be poisonous
- D.
All of the above
- 14.What component on the MA-3D air conditioner allows the operator to control the overall volume of air leaving the unit?
- A.
Blower control switch
- B.
Airflow control switch
- C.
Evaporator control switch
- D.
Temperature control switch
- 15.After the refrigerant leaves the compressor on the MA-3D air conditioner, it flows through the
- A.
Heatsink coils
- B.
Condenser coils
- C.
Evaporator coils
- D.
Receiver inlet valve
- 16.The temperature controller on the MA-3D air conditioner modulates the water flow through what component during low ambient air temperatures?
- A.
Aftercooler coils
- B.
Refrigerant coil
- C.
Expansion valve
- D.
Condenser coil
- 17.When starting the MA-3D air conditioner, hold the safety override switch until
- A.
The engine starts
- B.
The engine warms up
- C.
You release the start switch
- D.
30 psi oil pressure is registered on the engine oil pressure gauge
- 18.What component on the MA-3D air conditioner shuts off the compressors when refrigerant pressure entering the evaproator coil reaches 5 psi?
- A.
Low pressure cutout
- B.
High pressure cutout
- C.
Temperature controller
- D.
Temperature control switch
- 19.What equipment inspection requires the inspection of only asterisked items in the workcards?
- A.
Annual
- B.
Phase I
- C.
Service
- D.
Phase II
- 20.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
- 21.The refrigerant on the air conditioner is always removed through the
- A.
Purge valve
- B.
Receiver inlet valve
- C.
Receiver outlet valve
- D.
Discharge service valve
- 22.The air cycle machine of an A/M32C-10D air condition consists of
- A.
An expansion turbine only
- B.
An air compressor fan only
- C.
Heat exchanger and an expansion turbine
- D.
An expansion turbine and an air compressor fan
- 23.On a basic rotary compressor, what prevents air form leaving the discharge port while the intake prot is taking air in?
- A.
Sliding barrier
- B.
Discharge valve
- C.
Rotating barrier
- D.
Stationary barrier
- 24.Oil in the rotary vane compressor
- A.
Lubricates the connecting rods
- B.
Has high viscosity and is very inflammable
- C.
Forms a seal between the vanes and the stator
- D.
Permits it to be typed as a high pressure unit
- 25.What provides pressurized oil to the rotor blades of the MC-2A toraty sliding vane compressor?
- A.
Rotor shaft
- B.
Stator shaft
- C.
Drilled passages
- D.
Hollow-ported bolt
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