Electrical Engineering MCQs

Page No. 270

A 3-phase induction motor stator delta connected, is carrying full load and one of its fuses blows out. Then the motor_______________?


awill continue running burning its one phase


b will continue running burning its two phases


cwill stop and carry heavy current causing permanent damage to its winding


dwill continue running without any harm to the winding



Size of a high speed motor as compared to low speed motor for the same H.P. will be__________?


abigger


bsmaller


csame


d any of the above


View Answer smaller

Slip of an induction motor is negative when_____________?


amagnetic field and rotor rotate in opposite direction


b rotor speed is less than the synchronous speed of the field and are in the same direction


crotor speed is more than the synchronous speed of the field and are in the same direction


dnone of the above



If an induction motor with certain ratio of rotor to stator slots, runs at 1/7 of the normal speed, the phenomenon will be termed as____________?


ahumming


b hunting


ccrawling


dcogging


View Answer crawling

The ‘cogging’ of an induction motor can be avoided by____________?


aproper ventilation


busing DOL starter


c auto-transformer starter


dhaving number of rotor slots more or less than the number of stator slots (not equal)



The power factor of an induction motor under no-load conditions will be closer to_____________?


a0.2 lagging


b0.2 leading


c0.5 leading


dunity


View Answer 0.2 lagging

The ‘crawling” in an induction motor is caused by___________?


ahigh loads


blow voltage supply


cimproper design of machine


d harmonics developed in the motor



except_____________?


a changing supply frequency


bchanging number of poles


cchanging winding resistance


dreducing supply voltage



DOL starting of induction motors is usually restricted to_____________?


a low horsepower motors


bvariable speed motors


chigh horsepower motors


dhigh speed motors



In a three-phase induction motor, the number of poles in the rotor winding is always__________?


a zero


bmore than the number of poles in stator


cless than number of poles in stator


d equal to number of poles in stator



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