Refrigeration and Air Conditioning Technology (MindTap Course List)
8th Edition
ISBN: 9781305578296
Author: John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher: Cengage Learning
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Textbook Question
Chapter 5, Problem 8RQ
A vacuum pump is used to
A. remove contaminants from a refrigeration system.
B. vacuum dust before installing the refrigeration system compressor.
C. vacuum the area before using an air-acetylene unit.
D. prepare an area for taking a temperature reading.
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Students have asked these similar questions
For a hydraulic power unit, this part protects the pump from taking in any harmful particles that may be in the reservoir
a. liquid level gauge
b. filler/breather
c. pressure gauge
d. suction strainer
to run
d. both a and b
44. Ifa thermostatic expansion valve's thermal bulb came loose from the suction line at the outlet of the
evaporator, whích of the following could result?
The bulb pressure would increase and the c.
thermostatic expansion valve would
open.
b. The superheat in the evaporator would
decrease.
a.
Liquid refrigerant would flow back to the
compressor.
d.
All of the above are correct.
45. If the thermal bulb assembly develops a leak, what will occur?
All of the system's refrigerant will leak
a.
The valve will open to allow more
c.
refrigerant to flow.
d. It will have no effect on system
operation.
out.
b. The bulb pressure will reduce and the
valve will close.
46. The purpose of an externally equalized thermostatic expansion valve is to
compensate for excessive evaporator
pressure drop
b. allow system to equalize faster
a.
prevent the expansion valve from
frosting up
d.
c.
allow refrigerant to expand in the
compressor
47. The primary function of an expansion device is…
Which of the following is true regarding the refrigerantpiping on a rooftop package unit?A. The discharge and liquid lines must be field installed.B. The suction and liquid lines must be field installed.C. The discharge and suction lines must be field installed.D. No refrigerant lines are field installed.
Chapter 5 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 5 - _________and _________are two types of screwdriver...Ch. 5 - Five different types of wrenches are_____,_____,...Ch. 5 - Give an examples of a use for a nut driver.Ch. 5 - List four different types of pliers.Ch. 5 - Describe two types of benders for soft tubing.Ch. 5 - A wiring and crimping tool is used to A. crimp...Ch. 5 - A flaring tool is used to A. cut copper tubing. B....Ch. 5 - A vacuum pump is used to A. remove contaminants...Ch. 5 - Two types of refrigerant leak detectors are...Ch. 5 - List the components usually associated with a...
Ch. 5 - List three types of thermometers.Ch. 5 - For what type of soldering is a soldering gun...Ch. 5 - An air-acetylene unit is used for _______ and...Ch. 5 - Prob. 14RQCh. 5 - When are air velocity measuring instruments used?Ch. 5 - Describe the purpose of CO2 and O2 indicators.Ch. 5 - What is the purpose of a draft gauge?Ch. 5 - Prob. 18RQCh. 5 - Why would a technician use an electronic charging...Ch. 5 - Why is it necessary to recover refrigerant?
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