Commercial Refrigeration FINAL TEST Latest
Update 2026-2027 Exam 85 Questions with 100%
Verified Correct Answers Guaranteed A+
A SORIT, BEPR, or CDA valve may be used as a ____ valve - CORRECT ANSWER:
Evaporator pressure regulating (EPR)
A typical low temperature rack maintains a suction temperature of ____ - CORRECT
ANSWER: -25 degrees F
ARI Standard 710-86 specifies flow rates through a filter drier at a pressure drop of
_____ - CORRECT ANSWER: 1 Psig
How are the disadvantages overcome in compressors that are employed in low
temperature applications? - CORRECT ANSWER: Use supplementary cooling
How are the disadvantages overcome in water cooled hermetic compressor systems? -
CORRECT ANSWER: Have water jackets, or water coils around the compressor/motor
shell or housing
How far away from the inlet air wall should the air opening for condensers be when
condensing units are place in position? Why? - CORRECT ANSWER: They should be
located side by side, facing the wall, with the air openings at a distance of 24 to 36
inches
This ensures that all units get a sufficient supply of outside air
How is compressor efficiency often judged? - CORRECT ANSWER: Btu per cubic foot
(Btu/ft^3) of displacement
, How is the cooling effect in a mechanical refrigeration system produced? - CORRECT
ANSWER: Evaporation of liquid refrigerant into vapor
How many sources of heat have to be rejected from the vapor in the condenser? -
CORRECT ANSWER: Three, the heat absorbed in the evaporator, the heat picked up in
the suction line, the additional heat of compression caused by compressor operation
If a choice is available, should a drier be installed in a vertical position or horizontal
position? - CORRECT ANSWER: Vertical
If an air cooled condensing unit room has an exhaust capability of 1000 cfm per unit
horsepower and 2 1/2 ft^2 of inlet louver per unit horsepower, what will the average inlet
air velocity be in feet per minute? - CORRECT ANSWER: Less than 500 ft/min
If condensing pressure is higher than the corresponding condensing temperature, what
is normally the cause? - CORRECT ANSWER: Non condensable gases
If the suction gas superheat is too low, What could be the result? - CORRECT
ANSWER: Liquid refrigerant might enter the compressor. This causes stress on the
compressor valves, wrist pins, rods, shaft, etc. It also causes excessive foaming of the
oil in the crankcase and other damaging effects. The compressor will not reach its rated
capacity
In a reciprocating compressor, the piston is connected to the crankshaft by a _____ -
CORRECT ANSWER: Connecting rod
Is refrigerant gas more soluble in oil at low temperatures or high temperatures? -
CORRECT ANSWER: Low
Is the condenser load greater or less for compressors designed for low temperature
applications than for compressors designed for high temperature applications? -
CORRECT ANSWER: The condenser load is less for the low temperature applications
Update 2026-2027 Exam 85 Questions with 100%
Verified Correct Answers Guaranteed A+
A SORIT, BEPR, or CDA valve may be used as a ____ valve - CORRECT ANSWER:
Evaporator pressure regulating (EPR)
A typical low temperature rack maintains a suction temperature of ____ - CORRECT
ANSWER: -25 degrees F
ARI Standard 710-86 specifies flow rates through a filter drier at a pressure drop of
_____ - CORRECT ANSWER: 1 Psig
How are the disadvantages overcome in compressors that are employed in low
temperature applications? - CORRECT ANSWER: Use supplementary cooling
How are the disadvantages overcome in water cooled hermetic compressor systems? -
CORRECT ANSWER: Have water jackets, or water coils around the compressor/motor
shell or housing
How far away from the inlet air wall should the air opening for condensers be when
condensing units are place in position? Why? - CORRECT ANSWER: They should be
located side by side, facing the wall, with the air openings at a distance of 24 to 36
inches
This ensures that all units get a sufficient supply of outside air
How is compressor efficiency often judged? - CORRECT ANSWER: Btu per cubic foot
(Btu/ft^3) of displacement
, How is the cooling effect in a mechanical refrigeration system produced? - CORRECT
ANSWER: Evaporation of liquid refrigerant into vapor
How many sources of heat have to be rejected from the vapor in the condenser? -
CORRECT ANSWER: Three, the heat absorbed in the evaporator, the heat picked up in
the suction line, the additional heat of compression caused by compressor operation
If a choice is available, should a drier be installed in a vertical position or horizontal
position? - CORRECT ANSWER: Vertical
If an air cooled condensing unit room has an exhaust capability of 1000 cfm per unit
horsepower and 2 1/2 ft^2 of inlet louver per unit horsepower, what will the average inlet
air velocity be in feet per minute? - CORRECT ANSWER: Less than 500 ft/min
If condensing pressure is higher than the corresponding condensing temperature, what
is normally the cause? - CORRECT ANSWER: Non condensable gases
If the suction gas superheat is too low, What could be the result? - CORRECT
ANSWER: Liquid refrigerant might enter the compressor. This causes stress on the
compressor valves, wrist pins, rods, shaft, etc. It also causes excessive foaming of the
oil in the crankcase and other damaging effects. The compressor will not reach its rated
capacity
In a reciprocating compressor, the piston is connected to the crankshaft by a _____ -
CORRECT ANSWER: Connecting rod
Is refrigerant gas more soluble in oil at low temperatures or high temperatures? -
CORRECT ANSWER: Low
Is the condenser load greater or less for compressors designed for low temperature
applications than for compressors designed for high temperature applications? -
CORRECT ANSWER: The condenser load is less for the low temperature applications
