EBK POWER SYSTEM ANALYSIS AND DESIGN
6th Edition
ISBN: 9781305886957
Author: Glover
Publisher: CENGAGE LEARNING - CONSIGNMENT
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1- The stator core of a 3- phase induction motor is laminated in order to reduce the
Eddy current loss
) Weight of the stator
(B) Hysteresis loss (C) Both eddy current and hysteresis loss
- In cumulatively cascade method for speed controlling of a 3-phase induction motor, if PA is the
number of poles of main motor and P, is the number of poles of auxiliary motor. Then the speed of the
motor B is given by
Ⓐ120f/ PA + PB
CO
(B) 120f/PA-Ps
(C) 120f/PA (D) 120f/ Ps
3-Direct online starter is used for 3- phase induction motors having capacity
COOOO
⑭Ⓐ Less than 5 h.p. (B) Less than 10 h.p. (C) Greater than 10 h.p. (D) For any capacity motor
4-Crawling of a 3- phase induction motor is a phenomena mainly associated with
(B) 5th harmonics Ⓒ) 7 th harmonics (D) 2nd harmonics
(A) 3rd harmonics
5-Cogging in a 3- phase induction motor is caused ---------
(Ⓐ) If the number of stator slots are equal to number of rotor slots
(B) If the motor is running at fraction of its…
Choose the correct answer:
1-We avoid line starting of induction motor and use starter because...
(A) It will run in reverse direction (B) It will pick up very high speed and may go out of step
Motor takes five to seven times its full load current (D) Starting torque is very high
2-DOL starting of induction motors is usually restricted to...........
A Low horsepower motors
(D) High speed motors
(B) Variable speed motors (C) High horsepower motors
3- The method which can be used for the speed control of induction motor from stator side is.........
(A) V/f control
(B) Controlling number of stator poles to control Ns
(C) Adding rheostats in stator circuit
All of these
4-In cumulatively cascade method for speed controlling, if PA is the number of poles of main motor
and PB is the number of poles of auxiliary motor. Then the speed of the rotor B is given by
120f/PA + PB (B) 120f/PA-PB
(C) 120f/PA
5-The crawling in the induction motor is caused by..............
(A) low voltage supply (B)…
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