Refrigeration System Quiz

A Evaporator Pressure Regulator (EPR) is designed to

• Maintain a minimum evaporating temperature

• Maintain a minimum evaporator superheat

• Maintain a constant subcooling value

• Maintain a constant crankcase pressure

A Evaporator Pressure Regulator (EPR) is designed to

• Maintain a constant crankcase pressure

• Maintain a constant subcooling value

• Maintain a minimum evaporating pressure

• Maintain a minimum evaporator superheat

A Crankcase Pressure Regulator (CPR) is designed to

• Limit the pressure leaving the compressor

• Maintain a constant condensing pressure

• Maintain a constant pressure in the crankcase

• Limit the pressure returning to the compressor

What is the condition of the refrigerant as it enters the expansion device?

• LP superheated vapour

• HP subcooled liquid

• LP superheated liquid

• HP superheated vapour

What is the condition of the refrigerant as it enters the compressor?

• LP superheated vapour

• HP subcooled liquid

• LP superheated liquid

• HP superheated vapour

Which refrigerant is generally used in new domestic systems?

• R-717

• R-22

• R-134a

• R-600a

Which refrigerant is a hydro-carbon?

• R-717

• R-22

• R-134a

• R-600a

The dielectric strength of refrigerant oils should be

• Water based

• High

• Low

• Poly-ester based

Which material has the highest electrical resistance?

• Aluminium

• Steel

• Air

• Copper

Which material has the lowest electrical resistance?

• Aluminium

• Steel

• Air

• Copper