Electrical Engineering MCQs

Page No. 39

For crane travel which of the following motors is normally used ?


aSynchronous motor


b D.C. differentially compound motor


cWard-Leonard controlled D.C. shunt motor


dAC. slip ring motor


View Answer AC. slip ring motor

The characteristics of drive for crane hoisting and lowering are which of the following ?


aPrecise control


bSmooth movement


c Fast speed control


dAll of the above


View Answer All of the above

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is____________________?


aslop speed operation


bhigh starting torque


clow windage losses


d all of the above


View Answer high starting torque

By the use of which of the following m D.C. can be obtained from AC. ?


aSilicon diodes


bMercury arc rectifier


cMotor generator set


d Any of the above


View Answer Any of the above

Heavy duty cranes are used in________________?


aore handling plants


b steel plants


c heavy engineering workshops


dall of the above


View Answer all of the above

In ______________ the speed can be varied by changing the position of brushes?


a slip ring motor


bschrage motor


c induction motor


drepulsion motor


View Answer schrage motor

For a motor-generator set which of the following motors will be preferred ?


aSynchronous motor


bSlip ring induction motor


cPole changing induction motor


d Squirrel cage induction motor


View Answer Synchronous motor

In ________________ method of staging three phase induction motors the starting voltage is not reduced?


aauto-transformer


bstar-delta


cslip ring


d any of the above


View Answer slip ring

Battery operated scooter for braking uses________________?


a plugging


bmechanical braking


cregenerative braking


drheostatic braking


View Answer mechanical braking

In which of the following applications variable speed operation is preferred ?


aExhaust fan


bCeiling fan


cRefrigerator


dWater pump


View Answer Ceiling fan

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