Answered: electricians can observe the evening… | bartleby

Electric Motor Control

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter48: Plugging

Section: Chapter Questions

Problem 11SQ

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electricians can observe the evening blackening of all motor engines that occurs when the motor has failed due to what

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26. Is the amount of motor reactive power Q higher than the amount of motor active power P when the three-phase induction motor operates without load? O No O Yes What does this indicate about three-phase induction motors operating without load?
The NEC requires that each phase of a motor be protected by an overload relay.
which of the following is sometimes referred to as the motor secondary of a 3 phase induction motor ? a- stator b- rotor c- both a and b d- neither
If the applied voltage drops to half value while the asynchronous motor is running at full load, which of the following situations will occur? A) MOTOR CURRENT DOES NOT CHANGE B) THE ENGINE CONTINUES TO WORK AT THE SAME SPEED BECAUSE THE FREQUENCY DOES NOT CHANGE C) ENGINE MAY REACH AND STOP D) ENGINE SPEED
D is the correct option explain properly please
A 10 pole, 25 Hz alternator is directly coupled to and is driven by 60 Hz synchronous motor. What is the number of poles for the synchronous motor?
QUESTION 1 A three phase induction motor runs on 60 Hz power line at 1070 rpm at full load. The motor has one pair of poles for each phase. What is most nearly the motor's synchronous speed ? 1200 rpm 900 rpm 1600 rpm O 300 rpm QUESTION 2 What is most nearly the motors full -load slip, from question #1 ? O 10.8 9% 3.2 % 14.2 % 2.7 %
What will be done to keep the alternator end voltage constant, which changes as the alternator is loaded at different loads? Please explain.
Differentiate between the AC and DC magnetic fields applied to an induction motor stator.
Incorrect Question 25 A compound DC generator consists of which of the following. O None of the Answers O An armature coil only O A series and a shunt coil only O A series field coil only O A shunt field coil only
. A) Which of the following is/are a part of a 3-phase induction motor? a) stator b) rotor c) both "a" and "b" d) neither "a" nor "b" B) Which of the following is sometimes referred to as the motor secondary of a 3-phase induction motor? a) stator b) rotor c) both "a" and "b" d) neither "a" nor "b" C) How does the rotor of a 3-phase induction motor get power? a) through brushes and commutator segments b) through brushes and slip rings c) induction from the stator d) none of the above
7. Conventional rotating exciter is basically a (a) d.c. shunt generator (c) d.c. series motor (b) d.c. series generator (d) d.c. shunt motor 8. With reduction of load on an alternator (a) The frequency increases (b) The frequency decreases (c) The frequency oscillates (d) The frequency remains constant 9. If the field of one of the alternators running in parallel is adjusted it will (a) Reduce its speed (b) Change its load (c) Change its power factor (d) Change its frequency. 10. If the field of one of the alternators running in parallel is adjusted it will (b) Change its load (a) Reduce its speed (c) Change its emf (d) Change its frequency.

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