Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 10, Problem 8SQ
Refer to the circuit shown in Figure 10–6. Assume that when the thermostat contact closes nothing happens. Which of the following could NOT cause this condition?
a. The high-pressure switch is open.
b. The CCOL contact is open.
c. The low-pressure switch is open.
d. he coil of the compressor contactor is open.
Fig. 10–6 Pressure switches are often used in air-conditioning circuits.
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Chapter 10 Solutions
Electric Motor Control
Ch. 10 - Describe how pressure switches are connected to...Ch. 10 - What type of pressure switch is generally used to...Ch. 10 - A pressure switch is set to cut in at a pressure...Ch. 10 - A pressure switch is to be installed on a system...Ch. 10 - A pressure switch is to be installed in a circuit...Ch. 10 - Refer to the circuit shown in Figure 105. If the...Ch. 10 - Refer to the circuit shown in Figure 105. Assume...Ch. 10 - Refer to the circuit shown in Figure 106. Assume...Ch. 10 - Refer to the circuit shown in Figure 106. Assume...Ch. 10 - Refer to Figure 106. When the thermostat contact...
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- Refer to Figure 106. When the thermostat contact closes, the compressor and evaporator fan start but the condenser fan does not start. Which of the following could NOT cause this problem? a. The condenser fan motor is burned out. b. The coil of the CF contactor is open. c. One of the CF load contacts is defective. d. The CFOL contact is open. Fig. 106 Pressure switches are often used in air-conditioning circuits.arrow_forwardRefer to the circuit shown in Figure 106. Assume that when the thermostat contact closes the compressor does not start, but the condenser fan and evaporator fan do start. When troubleshooting the circuit, a voltmeter connected across the compressor contactor coil CC indicates 0 volts. A voltmeter connected across the high-pressure switch indicates 0 volts, and a voltmeter placed across the thermostat contact indicates 0 volts. When the voltmeter is connected across the low-pressure switch it indicates 24 volts. Which of the following conditions could cause this problem? a. The refrigerant pressure is too high. b. The compressor contactor coil is open. c. The refrigerant pressure is too low. d. The thermostat contact is open. Fig. 106 Pressure switches are often used in air-conditioning circuits.arrow_forwardWhich of the following is the largest electrical load in an air-conditioning or refrigeration system? evaporator fan motor condenser fan motor compressor relay coilarrow_forward
- 8.a. Which of the following most accurately describes the difference between a contactor and a starter?A. A starter contains a contactor and some additional protective circuitry.B. A starter is always mounted in an enclosure.C. A starter contains reversing contacts.D. A starter is always three-phase while a contactor may be single-phase or three-phase.8.b. The main bus in a motor control center is used toA. reduce the possibility of overload with large loads.B. enclose motors within a protective shield.C. distribute power to all starters in the center.D. reduce the voltage of the plant's supply.arrow_forwardYou are changing the starting relay on a central air-conditioning unit when you notice that the identifying mark on the compressor-run capacitor is connected to the run winding of the compressor. Should you change the capacitor connection so that the identifying mark is facing the line side or is it correct as connected? Explain your answer.arrow_forwardDesign a ladder program to run the material mixing system according to the following information: 1- When the start push button I0.0 is pressed, the pump (PUMP1 Q0.0) works for five seconds and then stops. 2- After that, the pump (PUMP2 Q0.1) runs for three seconds and then stops. 3- After that the pump (Mixer Motor Q0.2) works for 60 sec and then stops. 4- After that, the control valve (drian valve Q0.3) is opened, the pump (PUMP3 Q0.4) works for ten seconds. 5- The stop push button I0.1 is used to stop the system.arrow_forward
- A 350-HP squirrel-cage induction motor is connected to a 480-volts three-phase feeder. The nameplate lists the following: HP 350, Service factor 1.10, Full-load amps 408, NEMA Code B. The conductors are to be copper with THWN insulation, and 600:5 current transformers are used to reduce the current supplied to the overload heaters. The motor circuit is protected with dual-element time delay fuses. Determine the conductor size, overload heater size using the chart shown in Figure 34-7, the NEMA and IEC starter sizes, and the fuse size for this installation.arrow_forward29. The overload relay used to protect each motor - compressor set shall be selected to trip at NOT more than ____ of the motor-compressor rated load current. a. 125% b. 150% c. 140% d. 160%arrow_forwardTo answer the following questions refer to Figure 1210. When the thermostat contacts close the blower motor starts and the heating elements turn on normally. When the thermostat contacts open, the heating elements turn off and the blower motor stops running immediately. Which of the following could cause the problem? a. The thermostat contacts did not open. b. The flow switch contacts did not open. c. The fan thermostat contacts did not close. d. BMR coil is open. FIG. 1210 Air flow must be present before heating elements can be energized.arrow_forward
- (c) Draw a circuit diagram to represent a TN-C-S earthing system and briefly explain its advantages and disadvantages. (d) Briefly explain how to estimate the height of air termination of a lightning protection system network using the rolling sphere method and protection angle method. (e) Briefly explain what is meant by Ground Potential Rise (GPR) and explain why an animal like cow would not be adequately protected against GPR. Note : answer all or else dnt attempt the questionarrow_forwardControl Please INeed Answer after 30 minarrow_forwardWhen the thermostat contacts close, the blower motor starts and heating element #1 turns on. After a time delay heating element #3 turns on, but heating element #2 never turns on. Which of the following could cause this condition? a. Timed contact T1 did not close. b. Heating element #2 is open. c. CR relay coil is open. d. The flow switch is defective and did not close its contacts. FIG. 1210 Air flow must be present before heating elements can be energized.arrow_forward
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