Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 41, Problem 2SQ
If the motor fails to achieve synchronous operation, what action is necessary?
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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 -
2. How many poles does a synchronous motor have if it operates at 200 rpm when
connected to a 60-cycle source?
Discuss the possible situation that happened if the speed of a synchronous motor reaches the nameplate RPM
Chapter 41 Solutions
Electric Motor Control
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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
- Explain the operation of a synchronous motor as a synchronous condenserarrow_forward*A synchronous motor working at leading power factor can be used as Synchronous induction motor Static condenser Synchronous condenser None of the above The speed regulation of a synchronous motor is 100% 50% 25% 0% * The armature current of the synchronous motor has large values for High excitation Low excitation Both high and low excitation None of the abovearrow_forwardThe factor that enables the synchronous motor to operate at different electrical load characteristics Please explain.arrow_forward
- What is synchro? Explain how it is controlled with respect to control systemarrow_forwardWhat is the reason of the "pendulum" in a synchronous motor and how can it be corrected?arrow_forwardWhat is the factor that enables the synchronous motor to operate at different electrical load characteristics? explain.arrow_forward
- K-1)The speed of a 3-phase wound-rotor induction motor can be changed by varying the amount of resistance in the rotor circuit. a) true b) false K-2). Which of the following statements are true about a 3-phase synchronous motor? a) It is a constant speed motor even under varying loads. b) It runs at the same speed the magnetic field rotates on the stator. c) It can correct its own, and the supply line's power factor d) all of the above K-3. A) What determines the speed of a 3-phase synchronous motor? a) the number of poles b) the frequency of the supply c) both "a" and "b" d) neither "a" nor "b" K-3)B) From a technician's standpoint, which of the following is the most practical method of providing a wide range of speed control for a 3-phase synchronous motor? a) by changing the frequency b) by changing the number of poles c) both "a" and "b" d) neither "a" nor "b"arrow_forwardDefine or state the principle of operation, draw the wiring diagram, discuss the construction and application of each motor Split phase capacitor motor Repulsion motorarrow_forward19. What effect does slip have on rotor reactance of a 3-phase squirrel-cage induction motor? a) rotor reactance increases with increases in slip b) rotor reactance decreases with increases in slip c) rotor reactance is not influenced by slip d) none of the abovearrow_forward
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