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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 23RQ
Explain why the lockout relay coil energizes instead of the contactor coil. See Figure 6.34.
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Select the proper choice(s) for each of the following statements:
1) To control single-acting cylinder we just need:
double-acting cylinder we should use
A2/2-way, 5/2-way,
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(B) 3/2-way, 4/2-way,
(D) 4/3-way, 3/2-way.
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(B) Pump,
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(C) meter-out the cylinder speed
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no one of these options.
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(B) meter-in the cylinder speed,
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(D) fluid that exits the DCV.
5) One of the…
Draw a series circuit with a thermostat,a low-pressure switch, and a highpressure switch used as safety controlsto protect a motor
What happens when the low-voltage current flow inthe coil primary winding is interrupted by the switchingdevice?a. The magnetic field collapses.b. A high-voltage is induced in the coil secondarywinding.c. Both a and b.d. Neither a nor b
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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- The large interconnecting line between the indoor and outdoor coil is the _____line.arrow_forwardWhat pin numbers are connected to the coil of an 8-pin control relay?arrow_forwardA three-phase motor nameplate indicates a full load current of 362 amperes. The nameplate indicates that the heaters are to be sized for 125% of motor full load current. Current transformers with a ratio of 600:5 are used to reduce the motor current. Using the chart shown in Figure 4–7B, determine the size of overload heaters needed to protect this motor.arrow_forward
- Referring to Figure 1214, assume that the normally open 2M contact located between wire numbers 23 and 29 is welded closed. Also assume that none of the motors are running. What would happen if: a. The number 2 push button was to be pressed before the number 1 push button? b. The number 1 push button was to be pressed first?arrow_forwardReferring to the schematic shown in Figure 97, how would the circuit operate if the normally closed R contact connected in series with F coil were to be connected normally open?arrow_forwardWhat is the Relay Number and its law?arrow_forward
- An open winding in an electric motor means that A. the winding is making contact with the motor frame. B. one winding is making contact with another winding. C. a wire in one winding is broken. D. the centrifugal switch to the start winding is open.arrow_forwardA wye-connected load has a phase current of 25 A. How much current is flowing through the lines supplying the load?arrow_forwardExplain how to set the neutral plane position of the brushes by using the series field.arrow_forward
- What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device? The primary winding delivers a high-voltage spark to the plugs. The magnetic field in the coil primary builds. The secondary voltage drops to zero volts. High voltage is induced in the secondary windinarrow_forwardQuestion 5: Explain what happens if it is operated without a starting rheostat; What else is used instead of the starter rheostat and how is the speed adjustment done in D.C series motor? Explain.arrow_forwardIs the resistance in the start winding greater or less than the resistance in the run winding?arrow_forward
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