Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 3, Problem 28SQ
To determine
Choose the best option which provides by the combination starter.
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Students have asked these similar questions
A motor starter contains protection devices to prevent an overcurrent condition in the motor's circuit. These devices are known as
A. thermal overloads.
B. circuit breakers.
C. thermal links.D. fuses.
Please answer alll with brief explanation
6.a. Arcing in manual starters is eliminated by the use ofA. overload relays.B. nonconductive contacts.C. blowout coils.D. spring-loaded handles.6.b. Chattering of AC contactors is prevented byA. blowout coils.B. air gaps.C. secondary windings.D. shading poles.
Chapter 3 Solutions
Electric Motor Control
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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- Subject: Power Engineering.arrow_forward20.a. A capacitive sensor is used to detect the presence of _______ objects.A. ferrousB. nonmovingC. nonconductiveD. magnetic20.b. A three-phase motor can be made to run backwards byA. connecting a resistor in series with the armature.B. reversing the control voltage connections.C. reversing three of its power leads.D. reversing two of its power leads.arrow_forwardi need the answer quicklyarrow_forward
- What is the necessity of 3point starter? What is starter ?arrow_forwardWhat is starter ? Function of starter?arrow_forwardIn 4-point starters the resistance is added in series with NVC because __________________a) To increase field currentb) To increase armature currentc) To limit the NVC currentd) To limit armature currentarrow_forward
- 7. Which statement is true for the process-control relay ladder diagram shown in the figure? A. The pressure switch, temperature switch, and push button must be closed for the motor to start. B. With the temperature switch closed, the motor will start once the push button is pressed. C. With the pressure switch closed and the push button released, the motor will start. D. Only the temperature switch has to close for the motor to start.arrow_forwardThe preferred method for applying the field excitation voltage uses a field relay which operates on the principle of A. speed application. B. time application.C. angle application. D. thermal application.arrow_forwardAdvanced industrial motorarrow_forward
- 9.a. The major failure area of a typical wound-field and wound-armature DC motor isA. a faulty commutator segment.B. open field windings.C. brush wear and failure.D. bearing failure.9.b. The magnetic material that's placed inside a coil of wire in a motor is called aA. concentrator.B. pole.C. form.D. rod.arrow_forwardWhy is it not necessary to show the Armature and cross bar or the overload reset mechanism in a wiring diagramarrow_forward1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forward
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