Commercial Refrigeration
Certification Exam Questions with
Correct Verified Solutions 100%
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Tube within a tube, shell and coil, and shell and tube are all types of:
A. water cooled condensers.
B. air cooled condensers.
C. receivers.
D. accumulators. - ANS ✓A. water cooled condensers.
The refrigerant condensing temperature in a water cooled condenser is
normally about ____ higher than the leaving water.
A. 100°F
B. 10°F
C. 30°F
D. 75°F - ANS ✓B. 10°F
The refrigerant in an air cooled condenser will normally condense at
approximately _____ higher temperature than the air passing over it.
A. 10°F
B. 30°F
C. 75°F
D. 100°F - ANS ✓B. 30°F
Commercial Refrigeration Certification
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Commercial
Workable head pressure during periods of low ambient temperature can be
achieved by using:
A. an economizer
B. evaporator dampers
C. evaporator flooding
D. fan-cycle control - ANS ✓D. fan-cycle control
Cooling towers that pass air over water to remove system heat are limited in
capacity by:
A. outside air wet bulb temperature.
B. outside air dry bulb temperature
C. inside air wet bulb temperature.
D. inside air dry bulb temperature. - ANS ✓A. outside air wet bulb
temperature.
One of the main reasons that reciprocating compressors are not 100%
efficient is:
A. CFC refrigerants.
B. clearance volume.
C. evaporator design
D. condenser design. - ANS ✓B. clearance volume.
An open drive compressor is most likely to develop a refrigerant leak at the:
A. valve plate.
B. suction service valve.
C. discharge service valve.
D. shaft seal. - ANS ✓D. shaft seal.
Commercial Refrigeration Certification
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Commercial
Multiple compressors provide:
A. positive on return.
B. lower humidity in high humidity locales.
C. capacity control
D. zone control. - ANS ✓C. capacity control
A dirty evaporator and subsequent low evaporator pressures will cause:
A. high compression ratios.
B. low compression ratios.
C. high head pressure
D. high suction pressure. - ANS ✓B. low compression ratios.
The thermostatic expansion valve (TEV) maintains a constant _____ in the
evaporator.
A. temperature
B. pressure
C. liquid level
D. superheat - ANS ✓D. superheat
The automatic expansion valve (AEV) maintains a constant _____ in the
evaporator.
A. temperature
B. pressure
C. liquid level
D. superheat - ANS ✓B. pressure
Commercial Refrigeration Certification
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