11.   An air conditioning system with a variable displacement compressor has poor performance in high demand situations. All of these could be the cause except:

A. a low refrigerant charge.

B. a faulty control valve.

C. a faulty low pressure switch.

D. a weak compressor.

16.   Technician A says the fixed orifice tube is located between the condenser and the evaporator. Technician B says this is considered a metering device as it changes refrigerant flow along with cooling demands. Who is correct?

A. Technician A

B. Technician B

C. Both Technicians A and B

D. Neither Technician A or B

12.   Technician A says an A/C clutch relay protects the control head from the clutch circuits high current. Technician B says a faulty relay will result in no A/C clutch operation. Who is correct?

A. Technician A

B. Technician B

C. Both Technician A and B

D. Neither Technician A or B

17.   A vehicle blows warm air only when sitting at stop lights. The least-likely cause of this would be:

A. an overheating engine.

B. weak electric fan motor.

C. frozen expansion valve.

D. debris in condenser fins.

13.   All of these are true about an A/C evaporator except:

A. it removes humidity from the air.

B. refrigerant flows from the bottom to the top.

C. refrigerant enters the core as a liquid.

D. the refrigerant changes from a vapor to a liquid as it receives heat from the cabin air.

18.   The carpet is wet on the passengers side of a vehicle. Technician A says this may be caused a leaking heater core. Technician B says this could be caused by a clogged evaporator case drip tube.
Who is correct?

A. Technician A

B. Technician B

C. Both Technicians A and B

D. Neither Technician A or B

14.   Technician A says the refrigerant always flows from the top of the A/C condenser to the bottom. Technician B says a restriction in an A/C condenser can cause damage to the compressor. Who is correct?

A. Technician A

B. Technician B

C. Both Technician A and B

D. Neither Technician A or B

19.   Technician A says an accumulator is a component incorporated into a (TX) expansion valve type system. Technician B says a receiver drier is a component incorporated into a cycling clutch type system. Who is correct?

A. Technician A

B. Technician B

C. Both Technicians A and B

D. Neither Technician A or B

15.   An A/C blower motor only operates in high speed. Technician A says there could be a short in the motors power feed. Technician B says it may have a faulty blower resister. Who is correct?

A. Technician A

B. Technician B

C. Both Technician A and B

D. Neither Technician A or B

20.   A TXV (thermal expansion valve) system blows cold air only for about five minutes before it goes warm. Technician A says this could be caused by a low system charge. Technician B says there could be moisture in the system. Who is correct?

A. Technician A

B. Technician B

C. Both Technicians A and B

D. Neither Technician A or B