Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 48, Problem 4SQ
To determine
Mention the preferred method of the plugging switch connection to the motor or the driven machine.
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Explain how does the current will be reduced during the starting of the motor.
4.a. The device which responds to the heat developed within the motor is theA. shading coil.B. short-circuiter.C. bimetallic protector.D. current-operated relay.4.b. How is a rotating magnetic field produced during starting in a split-phase motor?A. A capacitor is inserted in the auxiliary-winding circuit.B. A low resistance coil is placed around a portion of each pole.C. Brushes are shifted off the hard-neutral position.D. An auxiliary winding is made with a high ratio of resistance to reactance.
Q choose the correct answer:
1-Brushless excitation system consisting of....
a- Stator field winding and power diodes
b-stator and rotor field winding and capacitor
c- stator and rotor field winding and capacitor
d- Everything mentioned in the options
2- Voltage generated per phase in an alternator is
proportional to
a- Flux per pole
b- Number of turns in armature
c-Winding factors
d- Everything mentioned in the options
e- Frequency of waveform
3- If input mech. Power of SG constant, the functionality of
AVR is
a- Control flux of rotor
b-Control terminal voltage
c- Control flux and terminal voltage
d-Control Load angle
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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- Why is more than one coil used on a generator armature? a) to help keep the brush voltage as low as possible b) to increase the difference between the brush low voltage and brush high voltage c) to help maintain a more constant brush voltage d) none of the above . Which of the following is/are a type of DC generator armature winding configuration? a) lap b) wave c) frogleg d) all of the abovearrow_forwardQ2: b- Explain how does the three- phase induction motor work? *arrow_forwardwhat happened to the DC motor if it runs without any starter? Explain with diagramarrow_forward
- 23. When the circuit breaker is always tripping, most likely There is an overloading c. The supply line are open a. b. There is an over current d. The load is removed 24. The synchronous motor is not inherently self- starting because the rotating magnetic field does not have enough poles b. the rotating magnetic field is produced by only 50 HZ frequency currents the force required to accelerate the rotor is to the synchronous speed in an instant is d. the starting devices to accelerate the rotor to near synchronous speed is absent 25. Synchronous motor has speed a. slight drop in speed on full load b.high speed at low torque а. с. c. constant speed d. low speed at high -arrow_forwardDescribe the operation of the pull-in and hold on windings in a pre-engaged starter solenoidarrow_forward1. Explain the working Principle of Single Phase Induction Motor. 2. What are the different types of Starters to control AC-Motor. Explain briefly. 3. Explain DOL starter of Single Phase Induction Motor briefly. 4. What is the purpose of the magnetic contactor? 5. What is the use of auxiliary contact in the magnetic controller? 6. What happens when the holding coil gets the supply in the magnetic controller? 7. Explain the working principle of a relay.arrow_forward
- The required rated voltage applied to a six leads out motor are a. 760-volts and 440-volts c. 440-volts and 254-volts b. 220-volts and 127-volts d. All of the above The rotating parts of an AC machines is a. Field winding and the core c. Wound Rotor winding b. Armature winding and the core d. All of thesearrow_forwardOne type of failure that's more common with 200 HP motors than with 10 HP motors is A. rotor bar failure.B. contactor failure.C. bearing failure. D. stator failures.arrow_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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