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 17, Problem 11RQ
A PTC device is used
A. to start a hermetic compressor.
B. as a motor protector.
C. to protect against low oil pressure.
D. to protect against high oil temperature.
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Chapter 17 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 17 - The two popular operating voltages for residences...Ch. 17 - Prob. 2RQCh. 17 - Is the resistance in the start winding greater or...Ch. 17 - Which of the following devices may be wired into...Ch. 17 - Prob. 5RQCh. 17 - Define BEME.Ch. 17 - Why is the hermetic compressor motor manufactured...Ch. 17 - The two types of motors used for hermetic...Ch. 17 - How does power pass through the compressor shell...Ch. 17 - The two types of relays used to start hermetic...
Ch. 17 - A PTC device is used A. to start a hermetic...Ch. 17 - True or False: Three-phase motors have low...Ch. 17 - Prob. 13RQCh. 17 - Why is it desirable to have a two-speed...Ch. 17 - True or False: All electric motors must be cooled...Ch. 17 - True or False: An SCR is an electronic switch.Ch. 17 - Prob. 17RQCh. 17 - Capacitors are used after the converter to A....Ch. 17 - The converter A. changes the frequency of the...Ch. 17 - The inverter A. adjusts the frequency. B. adjusts...Ch. 17 - Briefly describe the operation of the three...
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- Please answer it Asap and completely for an upvote. Thank you.arrow_forward8. 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…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
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