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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