Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 10, Problem 10SQ
Refer to Figure 10–6. 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. 10–6 Pressure switches are often used in air-conditioning circuits.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
Explain the function and operation of a turbo intercooler. (10 - 20 words)
Why are stranded copper wire is used instead of solid copper wirename the four types of battery capacity rating
What type of engine conversion occurs when the battery is discharging?
List the seven components of the starting system
List the four most common start a customer complaints
What is the name of the stationary coil that produces current in the AC generator?
what is the name of the company that creates the rotating mechanical field of the AC generator?
a) What applications / experiments are necessary to find the Rc parameter in the equivalent circuit given in Figure 1?
b) Write the value of the Ir 'current given in Figure 1 with a sentence in the idle running test of the 3-phase Asynchronous motor.
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...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Refer to the circuit shown in Figure 106. 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. 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
- Using the schematic diagram in Figure 2023, determine the number of control wires needed to control the three-phase motor. Use the terminal and wire identification shown in the schematic as well as proper power circuit identification. FIG. 2023arrow_forwardA motor - compressor must be protected from overloads and failure to start by a time- delay fuse or inverse- time circuit breaker rated at no more than? Of the rated load current. A. 95% b. 105% c. 115% d. $125%arrow_forward1.Static synchronous compensator (STATCOM) for power factor improvement? Minimum 200 words. Handwriting is not requiredarrow_forward
- Explain the operating principle of an oil circuit breaker with emphasis on the reciprocating pump action.arrow_forwardA 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_forwardExcitation circuit internal resistance of a shunt excited DC generator of 150 kW, 250 V, 1350 rpm Rf = 10 Ω, armature circuit internal resistance Ra = 0.05 Ω. Excitation to adjust the end voltage of the machine A rheostat of Rreo = 40 has been installed in its circuit. Friction and ventilation losses are neglected. According to this, a) When the entire rheostat in the excitation circuit is activated and the generator is operating under rated conditions, a1) Calculate the load current, excitation and armature currents. a2) Calculate the emf induced in the armature and the power taken from the shaft. a3) Calculate the efficiency with the moment taken from the shaft. b) Spindle revolutions are reduced to n = 1000 rpm. In this case, Va = 250 V and Ea value in (a) What value should the rheostat be adjusted to keep the value found constant? In this new situation Calculate the power given.arrow_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_forward11. A synchronous motor is being tested for efficiency. If an auxiliary motor is needed for the testprocedure, the method applied is theA. electrical input method.B. retardation method.C. calorimeter method.D. mechanical input method.arrow_forward19.Ability of the power system to remain in synchronism after large disturbance is called as transient stability. Select one?: True or Falsearrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Electricity for Refrigeration, Heating, and Air C...Mechanical EngineeringISBN:9781337399128Author:Russell E. SmithPublisher:Cengage Learning
Power System Analysis and Design (MindTap Course ...Electrical EngineeringISBN:9781305632134Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. SarmaPublisher:Cengage Learning
Delmar's Standard Textbook Of ElectricityElectrical EngineeringISBN:9781337900348Author:Stephen L. HermanPublisher:Cengage Learning
Electricity for Refrigeration, Heating, and Air C...
Mechanical Engineering
ISBN:9781337399128
Author:Russell E. Smith
Publisher:Cengage Learning
Power System Analysis and Design (MindTap Course ...
Electrical Engineering
ISBN:9781305632134
Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:Cengage Learning
Delmar's Standard Textbook Of Electricity
Electrical Engineering
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Cengage Learning
Pressure Sensors with Display; Author: Balluff Worldwide;https://www.youtube.com/watch?v=HqAV2xjCLxE;License: Standard Youtube License