HVACR Journeyman Practice
Exam latest updated version
with expert solutions
In a (direct expansion) evaporator, liquid refrigerant must
boil away as close to the end of the coil as possible in
order to: - answer Operate at High Efficiency.
What is one of the main reasons that reciprocating
compressors are not 100% efficient? - answer Clearance
Volume
A dirty evaporator and return air filters subsequently
causes low evaporator pressures which will cause - answer
High Compression Ratios
The automatic expansion valve (AEV) maintains a constant
______ in the evaporator. - answer Pressure
Short cycling during pump down can be caused by -
answer a leaking compressor suction valve.
What type metering device is best suited in applications
where freeze protection is required? - answer Automatic
Expansion Valve (AEV)
, The "Fan Cycle Control" is used in conjunction with low
ambient temperature conditions to control __________. -
answer Condenser Pressure
What do water cooling towers require? - answer Periodic
de-scaling
A refrigeration system used to cool another refrigeration
system is called a _______. - answer Cascade System
High temperature refrigeration applications normally
provide box temperatures of: - answer 47ºF to 60ºF
Why must an oil separator be kept warm? - answer 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: - answer 20 Psig
Ester based oils are ________. - answer Synthetic Oil
What is the minimum clearance for access panels on an
outdoor condensing unit? - answer 30 inches
When installing a roof-mounted unit on a flat roof, what is
the minimum distance above the highest water level
expected that it should be installed? - answer 4 inches
Exam latest updated version
with expert solutions
In a (direct expansion) evaporator, liquid refrigerant must
boil away as close to the end of the coil as possible in
order to: - answer Operate at High Efficiency.
What is one of the main reasons that reciprocating
compressors are not 100% efficient? - answer Clearance
Volume
A dirty evaporator and return air filters subsequently
causes low evaporator pressures which will cause - answer
High Compression Ratios
The automatic expansion valve (AEV) maintains a constant
______ in the evaporator. - answer Pressure
Short cycling during pump down can be caused by -
answer a leaking compressor suction valve.
What type metering device is best suited in applications
where freeze protection is required? - answer Automatic
Expansion Valve (AEV)
, The "Fan Cycle Control" is used in conjunction with low
ambient temperature conditions to control __________. -
answer Condenser Pressure
What do water cooling towers require? - answer Periodic
de-scaling
A refrigeration system used to cool another refrigeration
system is called a _______. - answer Cascade System
High temperature refrigeration applications normally
provide box temperatures of: - answer 47ºF to 60ºF
Why must an oil separator be kept warm? - answer 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: - answer 20 Psig
Ester based oils are ________. - answer Synthetic Oil
What is the minimum clearance for access panels on an
outdoor condensing unit? - answer 30 inches
When installing a roof-mounted unit on a flat roof, what is
the minimum distance above the highest water level
expected that it should be installed? - answer 4 inches
