DC 3RD CLASS EXAM STUDY GUIDE
QUESTIONS WITH COMPLETE AND ACCURATE
SOLUTIONS
◉ Basic Components of Refrigeration Systems. Answer: Compressor
(Heart of the system) : Pumps refrigerant vapor
Condenser: Releases or absorbs heat from the refrigerant
Refrigerant Control(Metering Device): Releases liquid refrigerant
when it is needed
Evaporator: Absorbs heat from the medium being cooled.
Refrigerant: Heat transfer medium that absorbs and releases heat
through
◉ Compressor. Answer: Inlet from Evaporator, refrigerant is a low
temperature / low pressure vapor.
Outlet is a high pressure / high temperature vapor
, ◉ Condenser. Answer: Inlet from compressor, refrigerant is a high
pressure / high temperature vapor.
Outlet is a high pressure / low temperature liquid
◉ Metering Device. Answer: Inlet from condenser, refrigerant is in a
low temperature / high pressure liquid.
Outlet is a medium pressure / medium temperature vapor / liquid.
◉ Evaporator. Answer: Inlet from meter device, refrigerant is in
medium pressure / medium temperature vapor / liquid
Outlet is a low pressure / low temperature vapor
◉ R-11 Color?. Answer: Orange
◉ R-12 Color?. Answer: White
◉ R-22 Color?. Answer: Light Green
◉ R-123 Color?. Answer: Light Gray
QUESTIONS WITH COMPLETE AND ACCURATE
SOLUTIONS
◉ Basic Components of Refrigeration Systems. Answer: Compressor
(Heart of the system) : Pumps refrigerant vapor
Condenser: Releases or absorbs heat from the refrigerant
Refrigerant Control(Metering Device): Releases liquid refrigerant
when it is needed
Evaporator: Absorbs heat from the medium being cooled.
Refrigerant: Heat transfer medium that absorbs and releases heat
through
◉ Compressor. Answer: Inlet from Evaporator, refrigerant is a low
temperature / low pressure vapor.
Outlet is a high pressure / high temperature vapor
, ◉ Condenser. Answer: Inlet from compressor, refrigerant is a high
pressure / high temperature vapor.
Outlet is a high pressure / low temperature liquid
◉ Metering Device. Answer: Inlet from condenser, refrigerant is in a
low temperature / high pressure liquid.
Outlet is a medium pressure / medium temperature vapor / liquid.
◉ Evaporator. Answer: Inlet from meter device, refrigerant is in
medium pressure / medium temperature vapor / liquid
Outlet is a low pressure / low temperature vapor
◉ R-11 Color?. Answer: Orange
◉ R-12 Color?. Answer: White
◉ R-22 Color?. Answer: Light Green
◉ R-123 Color?. Answer: Light Gray
