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 47, Problem 4RQ
Blocked suction cylinder unloading is accomplished by
A. 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 system to close it off.
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Chapter 47 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 47 - When a chiller is used, the secondary refrigerant...Ch. 47 - What are the two basic categories of chillers?Ch. 47 - Three types of compressors are used for chillers:...Ch. 47 - Blocked suction cylinder unloading is accomplished...Ch. 47 - True or False: The capacity control for a screw...Ch. 47 - Which of the following methods are used to...Ch. 47 - Describe a direct-expansion versus a flooded...Ch. 47 - What is the purpose of multiple passes in a...Ch. 47 - The approach temperature for the evaporator is A....Ch. 47 - What type of water-cooled condenser is used in...
Ch. 47 - The compressor used in low-pressure chillers is...Ch. 47 - List the types of metering devices used with...Ch. 47 - The subcooling temperature in a condenser can be...Ch. 47 - What causes a surge in a centrifugal chiller?Ch. 47 - Why is it important to keep an operating log on a...Ch. 47 - Which of the following metering devices is used in...Ch. 47 - The purge unit in a low-pressure chiller removes...Ch. 47 - In an absorption chiller, _______is used to create...Ch. 47 - The types of energy used to power a typical...Ch. 47 - True or False: Some absorption machines are...Ch. 47 - What is the common refrigerant used in absorption...Ch. 47 - How is capacity control accomplished with a...Ch. 47 - True or False: Single-phase induction,...Ch. 47 - Describe how a wye-delta is started and runs.Ch. 47 - Why is it important to have phase protection for...
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- For a hydraulic power unit, this part protects the pump from taking in any harmful particles that may be in the reservoir a. liquid level gauge b. filler/breather c. pressure gauge d. suction strainerarrow_forwardWhat is the advantage of using an injector-type mixing chamber?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
- Technician A says that suction lines become verywarm during A/C operation. Technician B says that discharge lines connect the compressor tothe condenser. Who is correct?arrow_forwardIn which type of check valve are the inlet and outlet ports located directly opposite of one another? A. In-line check valve B. Reducing check valve C. Right-angle check valve D. Relief check valvearrow_forwardFor a hydraulic power unit, this part reads the oil pressure at the pump outlet a. filler/breather b. suction strainer c. liquid level gauge d. pressure gaugearrow_forward
- Compression takes place on both sides of the piston in two cylinders is known as a. single stage double acting b. multistage double acting c. multistage single acting d. single stage single actingarrow_forwardTechnician A says that suction lines become very warm during A/C operation. Technician B says that discharge lines connect the compressor to the condenser. Who is correct?arrow_forwardWhat is the function of a pilot-to-close check valve in a pneumatic system? A. Allows flow in reverse direction but to foward B. Blocks flow in reverse direction but not forward C. Allows flow in either direction D. Blocks flow in either direction Allows flow in reverse direction but not forward. Blocks flow in reverse direction but not forward. Allows flow in either direction. Blocks flow in either direction.arrow_forward
- The compressor which is is used in a.Two Stage reciprocating compressor in which two cylinders are present, big cylinder for 1st stage and small cylinder for second stage b.Two Stage reciprocating compressor in which two cylinders are present, Small cylinder for 1st stage and big cylinder for second stage c.Two Stage reciprocating compressor in which two cylinders are present, Both cylinders are for 1st stage compression of air d.Two Stage reciprocating compressor in which two cylinders are present, First cylinder is having smaller bore than second cylinder for compression of airarrow_forwardSuction accumulatorarrow_forwardIn perfect gas law demonstration experiment, the vacuum cylinder must be connected to: Select one: a. Pump inlet b. Pump discharge c. None of these d. Heat transfer service unitarrow_forward
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