Electrical Engineering MCQs

Page No. 272

The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type__________?


astar connected only

✖


bdelta connected only

✖


cA. and B. both

✓


dnone of the above

✖


View Answer A. and B. both

The crawling in the induction motor is caused by____________?


alow voltage supply

✖


b high loads

✖


charmonics develped in the motor

✓


d improper design of the machine

✖



Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?


a By changing the number of stator poles

✓


b Rotor rheostat control

✖


cBy operating two motors in cascade

✖


dBy injecting e.m.f. in the rotor circuit

✖



An induction motor is identical to_________?


aD.C. compound motor

✖


bD.C. series motor

✖


csynchronous motor

✖


dasynchronous motor

✓


View Answer asynchronous motor

The injected e.m.f. in the rotor of induction motor must have__________?


azero frequency

✖


bthe same frequency as the slip frequency

✓


c the same phase as the rotor e.m.f.

✖


d high value for the satisfactory speed control

✖



In case of the induction motors the torque is___________?


ainversely proportional to (Vslip)

✖


bdirectly proportional to (slip)2

✖


cinversely proportional to slip

✖


ddirectly proportional to slip

✓



The good power factor of an induction motor can be achieved if the average flux density in the air gap is___________?


aabsent

✖


b small

✓


clarge

✖


dinfinity

✖


View Answer small

A double squirrel-cage induction motor has______________?


atwo rotors moving in oppsite direction

✖


btwo parallel windings in stator

✖


c two parallel windings in rotor

✓


dtwo series windings in stator

✖



Star-delta starting of motors is not possible in case of____________?


asingle phase motors

✓


bvariable speed motors

✖


c low horse power motors

✖


dhigh speed motors

✖


View Answer single phase motors

The starting torque of a squirrel-cage induction motor is___________?


alow

✓


bnegligible

✖


csame as full-load torque

✖


dslightly more than full-load torque

✖


View Answer low

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