Electrical Engineering MCQs

Page No. 39

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


aSynchronous motor

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b D.C. differentially compound motor

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cWard-Leonard controlled D.C. shunt motor

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dAC. slip ring motor

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View Answer AC. slip ring motor

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


aPrecise control

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bSmooth movement

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c Fast speed control

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dAll of the above

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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

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bhigh starting torque

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clow windage losses

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d all of the above

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View Answer high starting torque

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


aSilicon diodes

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bMercury arc rectifier

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cMotor generator set

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d Any of the above

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View Answer Any of the above

Heavy duty cranes are used in________________?


aore handling plants

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b steel plants

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c heavy engineering workshops

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dall of the above

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View Answer all of the above

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


a slip ring motor

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bschrage motor

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c induction motor

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drepulsion motor

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View Answer schrage motor

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


aSynchronous motor

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bSlip ring induction motor

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cPole changing induction motor

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d Squirrel cage induction motor

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View Answer Synchronous motor

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


aauto-transformer

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bstar-delta

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cslip ring

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d any of the above

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View Answer slip ring

Battery operated scooter for braking uses________________?


a plugging

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bmechanical braking

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cregenerative braking

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drheostatic braking

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View Answer mechanical braking

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


aExhaust fan

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bCeiling fan

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cRefrigerator

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dWater pump

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View Answer Ceiling fan

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