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 16, Problem 2RQ
Pneumatic controls are operated by
A. water.
B. electricity.
C. electronics.
D. air.
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Chapter 16 Solutions
Refrigeration and Air Conditioning Technology (MindTap Course List)
Ch. 16 - True or False: Pneumatic controls are...Ch. 16 - Pneumatic controls are operated by A. water. B....Ch. 16 - One advantage of a modern control system is A....Ch. 16 - A control loop contains _______, _______, and...Ch. 16 - Pneumatic air must A. be clean and dry. B. have...Ch. 16 - The air supplied to a diaphragm is 20 psig, and...Ch. 16 - When a large volume of air is needed at a...Ch. 16 - Prob. 8RQCh. 16 - Prob. 9RQCh. 16 - An analog control signal A. has an infinite number...
Ch. 16 - Another term used to describe sensitivity in...Ch. 16 - Prob. 12RQCh. 16 - Prob. 13RQCh. 16 - One of the major components of a residential...Ch. 16 - Prob. 15RQCh. 16 - Describe a control device, and give three examples...Ch. 16 - Describe what a sensor does in a DDC system used...Ch. 16 - What is the difference between an active and a...Ch. 16 - A control system consists of what three basic...Ch. 16 - List six advantages that DDC control systems have...Ch. 16 - Describe the difference between the analog and...Ch. 16 - Describe the difference between an open-loop and a...
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- 1. Explain the three controls of hazards.arrow_forwardSelect the most accurate system from the following, O a. Lamp with on/off switch O b. Room heating system O c. Traffic light O d. Air conditionerarrow_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
- Which of the following statement(s) is(are) correct? a. For closed system operating adiabatically, work is obtained from the direct conversion of internal enerft of the fluid to work. b. Work or mechanical energy can spontaneously be converted to geat. c. Thermal energy with some effort, can only be partially converted to mechanical energy. d. If a system's work is positive, work is done to the system; work done by the system is negative.arrow_forwardSelect the simple system from the following. a. Air conditioner b. Closed loop room heating system c. Speed control of Motor d. Lamp with on/off switcharrow_forward5.A. If there's no adjusting valve at the outlet of a large pump, there should be a(n)A. aerator in the pump.B. orifice plate in the outlet.C. flow valve at the inlet. 5.B. A conveyor that uses a line shaft to turn the rollers should have the line shaft bearings checked on a PMinspection everyA. four weeks.B. six months.C. YEAR 5.C. You're going to install a new chain on a power transmission system. What else should you do with thissystem?A. Replace both sprocketsB. Check shaft bearings D. Check the motor and gearboxarrow_forward
- 2. Discuss the advantages and disadvantages of hydraulic control system with respect to pneumatics control system.arrow_forwardWhat is a Thermocouple: Select one: a. A Thermocouple is a temperature sensor that uses a small length of platinum wire that is trimmed to have particular resistance at specific temperature. b. A Thermocouple is a temperature sensor that consists of two wires of similar metals joined at one end. C. A Thermocouple is a type of resistor whose resistance varies with temperature. d. A Thermocouple is a temperature sensor that consists of two conducting wires of dissimilar metals joined at one end.arrow_forwardWhat can be manipulated in order to control the speed of work in a pneumatic actuator? A. Flow B. Pressure C. Direction D. Temperaturearrow_forward
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