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HVACR Journeyman Practice Exam
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HVACR Journeyman Practice Exam
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HVACR Journeyman Practice ExamIn a (direct expansion) evaporator, liquid refrigerant must boil away as close to the end
of the coil as possible in order to: - ANS-Operate at High Efficiency.
What is one of the main reasons that reciprocating compressors are not 100% efficient?
- ANS-Clearance Volume
A dirty evaporator and return air filters subsequently causes low evaporator pressures
which will cause - ANS-High Compression Ratios
The automatic expansion valve (AEV) maintains a constant ______ in the evaporator. -
ANS-Pressure
Short cycling during pump down can be caused by - ANS-a leaking compressor suction
valve.
What type metering device is best suited in applications where freeze protection is
required? - ANS-Automatic Expansion Valve (AEV)
The "Fan Cycle Control" is used in conjunction with low ambient temperature conditions
to control __________. - ANS-Condenser Pressure
What do water cooling towers require? - ANS-Periodic de-scaling
A refrigeration system used to cool another refrigeration system is called a _______. -
ANS-Cascade System
High temperature refrigeration applications normally provide box temperatures of: -
ANS-47ºF to 60ºF
Why must an oil separator be kept warm? - ANS-To prevent refrigerant from condensing
in the separator during the off cycle.
If a pressure control has been adjusted to cut in at 30 psig, in order to have a 10 psig
cut out, the differential setting of the control must be: - ANS-20 Psig
Ester based oils are ________. - ANS-Synthetic Oil
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