Sample F G 2

Which causes considerable ice build-up around a TEV?

• Evaporator fan failing

• Defrost failing

• Short of refrigerant

• High evaporator load

Which refrigerant listed below is A3?

• R290

• R1234yf

• R404a

• R717

Which of the following is used to transfer waste refrigerant from HCFC system to a storage cylinder?

• Recovery unit

• Reclaim unit

• Oil sump pump

• Vacuum pump

What would indicate that there had been a leak on a pressure relief valve on a liquid receiver?

• sweating on the outside of the receiver

• partial frosting on the valve

• condensation on the PRV

• excessive oil staining

If a leak occurs on a service valve, where is it likely around?

• the cap

• the stem

• the service valve key

• the gland nut

Excessive superheat across a direct expansion evaporator in a supermarket frozen food case is likely caused by:

• partially blocked EEV strainer

• overcharge of refrigerant

• evaporator fans turned off

• damaged evaporator fins

The reference point of a Celsius thermometer is taken from?

• -10 degrees C

• 0 degrees C

• +10 degrees C

• +20 degrees C

To save energy the evaporator temperature in an indoor of an air conditioner for human comfort cooling is:

• -10 degrees C

• +10 degrees C

• -15 degrees C

• +20 degrees C

Which one of the following is likely to damage a compressor?

• clear oil in the sump sight glass

• high suction superheat

• low suction superheat

• high subcooling

A TEV phial is disconnected from a suction line would cause?

• high superheat

• low superheat

• flooding back to the compressor

• high subcooling