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 45, Problem 24RQ
The adjustment device used for low atmospheric pressure conditions is called the _____ thermostatic adjustment control.
A. positive temperature coefficient
B. altitude
C. dual-voltage
D. condenser coil
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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.
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
Chapter 45 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 45 - The typical temperature inside the fresh-food...Ch. 45 - The operating condition for the single compressor...Ch. 45 - When the air temperature in a domestic freezer is...Ch. 45 - Typical head pressures should correspond to a...Ch. 45 - Using the temperature/pressure chart in Unit 3,...Ch. 45 - Using the pressure/temperature chart in Unit 3,...Ch. 45 - If a forced-draft evaporator fan motor is wired in...Ch. 45 - Frost accumulates on the evaporators of...Ch. 45 - The defrost cycle in a domestic refrigerator may...Ch. 45 - Prob. 10RQ
Ch. 45 - What are the two types of evaporators found in...Ch. 45 - Refrigerators currently being manufactured in the...Ch. 45 - Condensers in these refrigerators are...Ch. 45 - Home freezers are air-cooled and may have...Ch. 45 - Induced-draft condensers are typically used with...Ch. 45 - The capillary tube metering device is usually...Ch. 45 - Prob. 17RQCh. 45 - If the compressor has liquid refrigerant returning...Ch. 45 - Some freezers may have ______heaters to prevent...Ch. 45 - Welded ______sealed compressors are normally used...Ch. 45 - Special heaters called ______heaters are often...Ch. 45 - Prob. 22RQCh. 45 - Prob. 23RQCh. 45 - The adjustment device used for low atmospheric...Ch. 45 - Prob. 25RQ
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- What is a variable-output programmable thermostat?arrow_forwardIf the compressor and condenser fan motor will not operate but the indoor fan motor is operating, what would be the probable cause of the malfunction? a. Bad contactor coil b. Bad thermostat c. Bad condenser fan motor d. Bad compressorarrow_forward9 Which of the following causes cooling in the room? a. Generator b. Absorbor c. Evaporator d. Condenserarrow_forward
- Which of the following components are common to most automatic control systems for residential split air conditioners? a. Thermostat, contactor, transformer b. Thermostat, magnetic starter, contactor c. Thermostat, diode, contactor d. Thermostat, time-delay relay, contactorarrow_forwardWhich process would best represent the opposite ofexhausting air from a system?A. CoolingB. VentilatingC. HeatingD. Filteringarrow_forwardThe design boiling point for most evaporator coils in residential air-conditioning is __________ °F.arrow_forward
- Which of the following statements is false? The condenser is normally mounted just in front of the radiator. The receiver/dryer is a storage tank for the liquid refrigerant from the condenser. An accumulator is not used in any system with a receiver/dryer. All of the above.arrow_forwardIf a hot water reheat coil is installed with a two way modulating valve. A. The VAV box can only be used for a heating-only application . B. A variable volume circulating pump must be used. C. A constant volume circulating pump can be used. D. The VAV box can only be used for a cooling-only applicationarrow_forwardWhat is the primary purpose of a thermostat jiggle valve? Select one: a. To act as a bypass for coolant b. To relieve water pump pressure under load c. To ensure coolant flows the correct direction d. To aid in bleeding air from the systemarrow_forward
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