
Unit 25 review
Authored by Robert Hemmila
Science
University
NGSS covered
Used 7+ times

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15 questions
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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
Tags
NGSS.HS-PS3-4
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Technician "A" says that a multi-evaporator system equipped with three evaporators (one high temperature, one medium temperature, and one low temperature) will use one evaporator pressure regulator and two flow check valves. Technician "B" says that the crankcase pressure regulator is used to keep the low-temperature compressor from overloading on a hot pulldown. Which of the following statements is correct?
Technician "A" is correct. Technician "B" is correct.
Technician "A" is correct. Technician "B" is incorrect.
Technician "A" is incorrect. Technician "B" is correct.
Technician "A" is incorrect. Technician "B" is incorrect.
Tags
NGSS.HS-PS3-4
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To protect the compressor during periods of hot pull down, a(n) ____ valve is used.
EPR valve
CPR valve
CVPC valve
PCV valve
4.
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.
20
2
15
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Refrigeration systems are designed to operate year round. For this reason they are equipped with ____.
Low ambient control
seasonal offset
Fall evaporator control
Summer evaporator control
6.
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.
Tags
NGSS.HS-PS3-3
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Frequently on smaller condensing units, one fan will run continuously and the other fan will be cycled on and off with a(n) ____.
switch
Low ambient control
thermostst
archicetect control
Tags
NGSS.MS-PS3-3
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