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.
What is the value of value of motor speed when three phase induction motor is at starting condition? O 100 O 1 O 120f/P
Why would the slip not change? If you start the motor at 80% of the rated frequency, wouldn't that be 48 Hz?
What are the following statements are true for a three-phase induction motor? I. Three-phase induction motor stator winding is fed from a single-phase supply II. Stator carries a three-phase winding III. Rotor carries a short circuited winding a. I,II and III b. I only c. I and II only d. II and III
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?
In which type of induction motor, external resistance can be connected? squirrel cage Slip ring capacitor start capacitor start and run
Calculate the rotor reactance per phase of an 8 pole, 50Hz, 3Ø induction motor which develops a maximum torque at a speed of 660rpm. The resistance per phase of the rotor is 0.5Ω
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 %

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