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 25, Problem 3RQ
The purpose of the crankcase pressure-regulating valve is to
A. maintain constant pressure in the crankcase.
B. maintain constant pressure in the evaporator.
C. prevent a compressor from going into a vacuum.
D. prevent a compressor overload condition.
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Students have asked these similar questions
Pressure relief valves:
Select one:
a. Open manually upon overloading in
pressure
O b. Open automatically upon overloading
in pressure
c. Two directional valve
d. Oil flow control valve
A one-way valve that lets air into the reservoir of a compressor, but does not let it out, is a
Select one:
O a. Receiver valve
O b. Control valve
O . Check valve
O d. Three-way valve
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…
Chapter 25 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 25 - Which is not a basic component of the compression...Ch. 25 - Describe modulating fluid flow.Ch. 25 - The purpose of the crankcase pressure-regulating...Ch. 25 - Describe the function of an electric evaporator...Ch. 25 - Prob. 5RQCh. 25 - Briefly describe the function of a...Ch. 25 - Two types of relief valves are_______and ______.Ch. 25 - Why is low-ambient control necessary?Ch. 25 - Which is not a method of low-ambient control on...Ch. 25 - Low-pressure switch
Ch. 25 - High-pressure switchCh. 25 - Low-ambient(switch)Ch. 25 - Oil safety switchCh. 25 - What is the function of the current sensing relay...Ch. 25 - Why is there a time delay in an oil safety...Ch. 25 - What is off-cycle defrost?Ch. 25 - Two types of off-cycle defrost are______and...Ch. 25 - Two methods for accomplishing defrost on...Ch. 25 - Filter drierCh. 25 - Heat exchangerCh. 25 - Suction accumulatorCh. 25 - ReceiverCh. 25 - Prob. 23RQCh. 25 - Prob. 24RQCh. 25 - What will happen if the float in an oil separator...Ch. 25 - The function of the evaporator pressure regulator...Ch. 25 - What is the function of the oil return hole or...Ch. 25 - What is the function of the pressure equalization...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Blocked suction cylinder unloading is accomplished byA. keeping the suction valve closed.B. closing the discharge.C. closing the suction service valve.D. using a device in the low-pressure side of the systemto close it off.arrow_forwardWhen there is an excess potential energy during the fluid flow, it can be stored using O a. pressure relief valve. O b. pressure reducing valve. O C. accumulator. O d. pressure absorbing valve.arrow_forward17. Which of the following relief valves is designed to vent refrigerant under excessive pressure and then close when the system pressure has been lowered? A. Fusible plug. B. Manifold valve. ytor C. Rupture disc. D. Spring-loaded relief valve. e quicaarrow_forward
- is a type of safety valve used to control or limit the pressure in a system. Select one: O a. On and off valve O b. One way flow control valve O . Shutoff valve O d. Pressure relief valvearrow_forwardThe turbine is connected to generator which converts mechanical energy to electrical energy. A. True B. Falsearrow_forwardThe centrifugal compressor is used for refrigerants that require short displacement and high condensing pressure. True Falsearrow_forward
- What can be done to get water out from under the oil level in a compressor?arrow_forwardA pump forms a ___________system A. isolated B. closed C. both open and isolated D. openarrow_forwardA valve may be operated by any of the following except? a. none of the choices b. electronically c. mechanically d. manuallyarrow_forward
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