1|Page
Refrigeration Engineer License Exam COMPLETE
VERIFIRED QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE!!!.pdf
The entire refrigerant charge of a system should only fill
what percentage of the receiver?
a) 50%
b) 60%
c) 80%
d) 100%
e) 110% - Answer-c)
What type of valve can be installed between the receiver
and the pressure relief valve(s)?
a) ball valve
b) gate valve
c) three-way valve
d) emergency valve
e) no valve - Answer-c)
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2 types of pressure relief valves found on refrigeration
systems: - Answer-spring valve
one time
How does a pilot perated liguid line solenoid valve
operate? - Answer-Signal sent for system pressure to start
and stop flow
Air conditioning systems:
a) initiate defrost with a defrost clock
b) initiate defrost with a pressure switch
c) defrost during off cycle when the thermostat is satisfied
d) do not require defrost - Answer-d)
A low pressure switch will________ on rise in pressure -
Answer-close
A high pressure safety switch will ______ on rise in head
pressure - Answer-open
A fan cycling switch will _______ on rise in head pressure
- Answer-close
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When the box temperature is satisfied, the thermostat
contacts on the thermostat will_______ - Answer-open
Dampers for a condenser will ______ during low ambient
conditions - Answer-close
In an automatic pump-down system, the thermostat
controls the ________ operation - Answer-solenoid valve
In an automatic pump-down system, the pressure
controller will control the ______ operation - Answer-
compressor
Random defrost is accomplished:
a) with a timer
b) using the high pressure control
c) using the low pressure control
d) during normal off cycle when the box is satisfied -
Answer-d)
During electric defrost in a freezer:
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a) the compressor and the evaporator fans would be off
b) the electric heaters and the compressor would be on
c) the electric heaters and the compressor would be on
d) all of the above are possible - Answer-a)
Superheat is:
a) the heat of compression at the compressor
b) latent heat given off by the condenser
c) sensible heat absorbed by the refrigerant after it has
boiled to vapor
d) heat used to boil the liquid in the evaporator - Answer-c)
A metering device is degined to:
a) lower the boiling point of the refrigerant after it has
boiled to vapor
b) regulate the flow of refrigerant into the evaporator
c) produce a reduction in pressure on the liquidrefrigerant
d) all of the above - Answer-d)
A thermostatic expansion valve controls refrigerant flow to
the evaporator based on:
Refrigeration Engineer License Exam COMPLETE
VERIFIRED QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE!!!.pdf
The entire refrigerant charge of a system should only fill
what percentage of the receiver?
a) 50%
b) 60%
c) 80%
d) 100%
e) 110% - Answer-c)
What type of valve can be installed between the receiver
and the pressure relief valve(s)?
a) ball valve
b) gate valve
c) three-way valve
d) emergency valve
e) no valve - Answer-c)
,2|Page
2 types of pressure relief valves found on refrigeration
systems: - Answer-spring valve
one time
How does a pilot perated liguid line solenoid valve
operate? - Answer-Signal sent for system pressure to start
and stop flow
Air conditioning systems:
a) initiate defrost with a defrost clock
b) initiate defrost with a pressure switch
c) defrost during off cycle when the thermostat is satisfied
d) do not require defrost - Answer-d)
A low pressure switch will________ on rise in pressure -
Answer-close
A high pressure safety switch will ______ on rise in head
pressure - Answer-open
A fan cycling switch will _______ on rise in head pressure
- Answer-close
,3|Page
When the box temperature is satisfied, the thermostat
contacts on the thermostat will_______ - Answer-open
Dampers for a condenser will ______ during low ambient
conditions - Answer-close
In an automatic pump-down system, the thermostat
controls the ________ operation - Answer-solenoid valve
In an automatic pump-down system, the pressure
controller will control the ______ operation - Answer-
compressor
Random defrost is accomplished:
a) with a timer
b) using the high pressure control
c) using the low pressure control
d) during normal off cycle when the box is satisfied -
Answer-d)
During electric defrost in a freezer:
, 4|Page
a) the compressor and the evaporator fans would be off
b) the electric heaters and the compressor would be on
c) the electric heaters and the compressor would be on
d) all of the above are possible - Answer-a)
Superheat is:
a) the heat of compression at the compressor
b) latent heat given off by the condenser
c) sensible heat absorbed by the refrigerant after it has
boiled to vapor
d) heat used to boil the liquid in the evaporator - Answer-c)
A metering device is degined to:
a) lower the boiling point of the refrigerant after it has
boiled to vapor
b) regulate the flow of refrigerant into the evaporator
c) produce a reduction in pressure on the liquidrefrigerant
d) all of the above - Answer-d)
A thermostatic expansion valve controls refrigerant flow to
the evaporator based on:
