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 11RQ
The thermostat of the commercial freezer in Figure 6.20 is connected in series with which of the following electrical devices?
- a. compressor
- b. condenser fan motor
- c. evaporator fan motor
- d. all of the above
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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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- - Industrial Motor Controls, 12.a. What is the purpose of thermostat number 2, IN7, in the mixing vat machine?A. This thermostat is used to monitor the temperature of the incoming fluids.B. This thermostat is used to prevent an over-temperature condition in the event thermostat one sticks open.C. This thermostat is used to turn off the mixing motor after the mixture reaches temperature.D. This thermostat is used to shut off the heater when the chemical mix reaches setpoint.12.b. Why are motor current readings from a frequency inverter not exact readings of motor current?A. Because the output of a frequency inverter is not a sinewaveB. Because a frequency inverter adds a DC voltage level to the AC waveformC. Because a frequency inverter uses a lower voltage sinewaveD. Because the inverter pulses the motor with various sinewave frequenciesarrow_forwardWhat is a variable-output programmable thermostat?arrow_forwardWhat type of chemical is used to cause a pressure change in a bellows type thermostat?arrow_forward
- A disadvantage of a central forced-air electric furnace is that A. there is no zone control for individual rooms. B. a thermostat must be installed in each room. C. only line-voltage thermostats can be used. D. it is difficult to add air-conditioning (cooling)arrow_forwardTrue or False: The defrost timer motoroperates continuously in Figure 6.18.arrow_forwardDifferent types of IC enginesarrow_forward
- Select 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_forwardWhich of the following would not increase the rate of heat transferred from a heater pipe? A. Insulating with materials whose thickness is below that of critical thickness for insulation. B. Blowing air over it C. Providing fins D. Placing the heater pipe within another whose thermal conductivity is smaller in number and 2 inches thickarrow_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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