1.   A vehicle is equipped with a fixed orifice tube air conditioning system. A technician installs a set of A/C gauges on the vehicle after a complaint of poor A/C performance.The high side is low and the low side is high. This indicates a:

A stuck open expansion valve.

B frozen expansion valve.

C restricted condenser.

D faulty compressor.

6.   Technician A says oil residue on an A/C hose may indicate a refrigerant leak in the system. Technician B says today's R134a systems use mineral oil instead of the older R12 compatible PAG oil.  Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

2.   A vehicle blows warm air only when the heater is on high output. Technician A says to check the heater control valve. Technician B says the that heater core performance may be effected by the cooling systems thermostat. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

7.  A TXV expansion valve type systems suction line leading to the compressor is cool to the touch. This indicates:

A a stuck open expansion valve.

B a low refrigerant charge.

C a stuck closed expansion valve.

D a normal condition.

3.   Technician A says a fixed orifice tube varies refrigerant in relation to temperature providing greater efficiency at idle speeds. Technician B says the fixed orifice tube is located between the condenser and the evaporator.

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

8.   All of these are true about the air conditioning systems accumulator except:

A it is located on the low side of the system.

B it prevents excess liquid from entering the compressor.

C it contains a desiccant capable of absorbing moisture from the refrigerant.

D it is used in a TXV expansion valve type system.

4.   Technician A says the expansion valve on a TXV system is located on the inlet port of the evaporator. Technician B says to the valves temperature sensing bulb is located near the outlet port of the evaporator. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

9.  A customers vehicle has poor A/C performance. The customer states that the system may have R12 and R134a refrigerants mixed together in the system. Technician A says to use a refrigerant identifier. Technician B says this mixture is not recommended but will not effect system pressures. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

5.   Technician A says evacuating an A/C system will remove air and moisture. Technician B says to evacuate the system any time it's been opened to the atmosphere. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B

10.   A customer just had his air conditioner repaired and complains that it performs poorly during the hottest times of the day. Technician A says the technician may not have replaced the receiver drier along with the repair. Technician B says there may be moisture in the system. Who is correct?

A Technician A

B Technician B

C Both A and B

D Neither Technician A or B