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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