Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
10th Edition
ISBN: 9781337399128
Author: Russell E. Smith
Publisher: Cengage Learning
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Textbook Question
Chapter 6, Problem 19RQ
The compressor and condenser fan motor start __________.
- a. at separate times
- b. at the same time
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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 part in the mechanical heat pump is
used to increase the refrigerant pressure?
Select one:
a. Condenser
b. Evaporator
c. Expansion valve
d. Compressor
Choose correct answer:
In the heat pump system, the heat is usually rejected by ______________
A.
expansion device
B.
compressor
C.
condenser
D.
evaporator
Chapter 6 Solutions
Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)
Ch. 6 - Why should an air-conditioning technician learn to...Ch. 6 - Briefly explain the layout of a schematic diagram.Ch. 6 - Most schematic diagrams are made up of _____. a....Ch. 6 - Schematic diagrams break the wiring of control...Ch. 6 - Draw the symbols for the following components. a....Ch. 6 - What is the name of an appliance that is used to...Ch. 6 - What is the position of the control switch if the...Ch. 6 - Prob. 8RQCh. 6 - True or False: The evaporator fan motor is...Ch. 6 - What electrical component initiates the defrost...
Ch. 6 - The thermostat of the commercial freezer in Figure...Ch. 6 - What is the purpose of the fan switch in Figure...Ch. 6 - If the temperature in the furnace schematic shown...Ch. 6 - What is the purpose of the transformer in Figure...Ch. 6 - True or False: The system in Figure 6.28 is using...Ch. 6 - The HP and LP switches are connected in __________...Ch. 6 - The contactor is controlled by __________. a. the...Ch. 6 - With the fan switch in the on position, the indoor...Ch. 6 - The compressor and condenser fan motor start...Ch. 6 - The compressor and condenser fan motor are...Ch. 6 - Prob. 21RQCh. 6 - Prob. 22RQCh. 6 - Explain why the lockout relay coil energizes...Ch. 6 - True or False: The first- and second-stage cooling...Ch. 6 - True or False: A two-stage cooling thermostat...Ch. 6 - What is the purpose of the defrost cycle of a heat...Ch. 6 - What two factors initiate the defrost mode in the...Ch. 6 - What type of thermostat is used with the heat pump...Ch. 6 - Explain the operation of the switchover valve and...Ch. 6 - The reversing-valve solenoid is energized on the...Ch. 6 - The defrost cycle of the heat pump schematic in...Ch. 6 - What is a pump-down system and why is it used in...
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- The indoor coil is called a condenser during the______season.arrow_forwardThe type of condenser that has the lowest operating head pressure is the ___________ cooled condenser.arrow_forwardto 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…arrow_forward
- If 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_forwardWhich is the most accurate description of one of the system's processes? A Fluid moves from the secondary pipes into the ground. B Fluid moves from the primary pipe into the building. Fluids circulate separately inside both pipes. D Fluid moves from the secondary pipe through the heat exchanger to the primary pipe.arrow_forwardUsually evaporator pressure in refrigeration system is ____________ A. 120 kN/mm2 B. 0.12 N/mm2 C. 0.12 N/cm2 D. 120 N/mm2arrow_forward
- Heat expulsion occurs in what section of a heat pump system when operating in the heat mode? A. accumulator B. evaporator C. receiver D. condenserarrow_forward1. A temperature drop in the coolant entering the primary loop can be dangerous because,(a) Reactivity can increase as a result.(b) Pressure in the primary loop will decrease and water can flash to steam.(c) All of the above.(d) None of the abovearrow_forward1. An air-source heat pump is a heat-pump system that uses air: a. as the system refrigerant. b. as the heat source when operating in the cooling mode. c. as the heat sink when operating in the heating mode. d. as the heat source when operating in the heating mode. 2. According to the Department of Energy, duct leakage can result in a energy loss? a. 10% b. 20% c. 30% d. 40% 3. As the outside ambient temperature drops, the efficiency of a heat-pump system operating in the mode will: a. heating, drop b. heating, rise c. cooling, rise d. Both a and c are correct.arrow_forward
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