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 15, Problem 8RQ
The cooling anticipator is wired
A. in parallel with the cooling contact.
B. next to the liquid line.
C. in series with the cooling contact.
D. inside the indoor unit.
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8. What would be done to increase the compressor speed
on a belt-driven compressor?
A. Decrease drive pulley size
B. Increase drive pulley size
C. Increase driven pulley size
13. What lubricates the refrigeration compressor?
A. Refrigerant
B. Moisture
C. Desiccants
D. Oil
D. Both A andC
9. Describe the reciprocating compressor piston, rod,
crankshaft, valves, valve plate, head, shaft seal, internal
motor overload device, pilot-duty motor overload de-
vice, and coupling.
10. Name two things in the design of a reciprocating com-
pressor that control the efficiency of the compressor.
А.
14. What can the service technician do to keep the refrig-
eration system operating at peak efficiency?
15. List the main advantage that a discus compressor's
valve plate design has over a conventional piston-type
В.
11. At what speeds in rpm does a hermetic compressor nor-
mally turn?
A. 1750
В. 3450
C. 4500
D. Both A and B
12. What effect does a slight amount of liquid refrigerant
have on a compressor…
Which component is primarily responsible
for the pressure in a cooling system?
Select one:
a. The thermostat
b. The water pump
c. The radiator cap
d. The surge tank
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…
Chapter 15 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 15 - Name three types of automatic controls.Ch. 15 - Two categories ofelectric controls...Ch. 15 - What circuit is energized with the thermostat Y...Ch. 15 - The component in the system that is energized when...Ch. 15 - The ________terminal must be energized in the...Ch. 15 - The hot circuit in the thermostat is the...Ch. 15 - Is the heat anticipator in series or parallel with...Ch. 15 - The cooling anticipator is wired A. in parallel...Ch. 15 - Which anticipator is adjustable, heat or cool?Ch. 15 - True or False: The indoor fan must always run...
Ch. 15 - True or False: When the control transformer is not...Ch. 15 - Which of the following should be turned off while...Ch. 15 - The _______diagram is used to locate different...Ch. 15 - To trace the circuits in the unit, the...Ch. 15 - Prob. 15RQCh. 15 - Prob. 16RQCh. 15 - Prob. 17RQCh. 15 - True or False: Open switches will always read...Ch. 15 - Explain why a service technician must always know...
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