Electrical Engineering MCQs

Page No. 273

In Ns is the synchronous speed and s the slip, then actual running speed of an induction motor will be___________?


aNs


b s.N,


c(l-s)Ns


d(Ns-l)s


View Answer (l-s)Ns

Slip rings are usually made of___________?


acopper


b carbon


cphospor bronze


daluminium


View Answer phospor bronze

In case the air gap in an induction motor is increased____________?


athe magnetising current of the rotor will decrease


bthe power factor will decrease


cspeed of motor will increase


dthe windage losses will increase



In squirrel cage induction motors, the rotor slots are usually given slight skew in order to__________?


areduce windage losses


b reduce eddy currents


creduce accumulation of dirt and dust


dreduce magnetic hum


View Answer reduce magnetic hum

In medium sized induction motors, the slip is generally around___________?


a0.04%


b0.4%


c4%


d14%


View Answer 4%

Which of the following component is usually fabricated out of silicon steel ?


aBearings


b Shaft


c Statorcore


dNone of the above


View Answer Statorcore

An induction motor with 1000 r.p.m. speed will have____________?


a8 poles


b6 poles


c4 poles


d2 poles


View Answer 6 poles

The term ‘cogging’ is associated with___________?


athree phase transformers


bcompound generators


cD.C. series motors


d induction motors


View Answer induction motors

The number of slip rings on a squirrel cage induction motor is usually____________?


a two


b three


cfour


dnone


View Answer none

The efficiency of an induction motor can be expected to be nearly____________?


a60 to 90%


b 80 to 90%


c95 to 98%


d99%


View Answer 80 to 90%

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