
ACR-202-Unit 25 - Special Refrigeration System Components
Authored by Randall Graham
Professional Development
University
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Two-temperature operation of a refrigeration system is necessary when ____.
the compressor must be protected from overloading
more than one evaporator is used with a compressor
the coil in the evaporator is excessively long
a multiple-circuit distributor is used
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The EPR valve is installed in the suction line at the evaporator outlet and it ____.
modulates the refrigerant vapor to the compressor
prevents the boiling point in the evaporator from dropping below a pre-set point
when used with a TX valve the system has the characteristics of maintaining a constant superheat and keeping the pressure from going too low
All of the above.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
EPR valves are also referred to as ____ valves.
DRP
ORC
ORN
ORI
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To protect the compressor during periods of hot pull down, a(n) ____ valve is used.
TXV (thermostatic expansion valve)
EPR (evaporator pressure regulator)
CPR (crankcase pressure regulator)
LAC (low ambient control)
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The refrigeration compressor motor can be operated at about ____% over its rated capacity without harm during the pulldown.
5
10
15
20
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Refrigeration systems are designed to operate year round. For this reason they are equipped with ____.
relief valves
a low-ambient control
oversized evaporator coils
EEPR valves
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which of the following is a type of low-ambient temperature head pressure control?
CPR
EPR
Fan cycling
Off-cycle defrost
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