Electrical Engineering MCQs

Page No. 41

In jaw crushers a motor has to often start against ____________________ load?


aheavy

✓


bmedium

✖


cnormal

✖


dlow

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View Answer heavy

Which of the following motors is usually preferred for kiln drives ?


aCascade controlled A.C. motor

✖


bSlip ring induction motor

✖


cThree phase shunt wound com-mutator motor

✖


dAny of the above

✓


View Answer Any of the above

__________________ has relatively wider range of speed control?


aSynchronous motor

✖


bShip ring induction motor

✖


cSquirrel cage induction motor

✖


dD.C. shunt motor

✓


View Answer D.C. shunt motor

Rotor of a motor is usually supported on ___________________ bearings?


aball or roller

✓


bneedle

✖


cbush

✖


dthrust

✖


View Answer ball or roller

The size of an excavator is usually expressed in terms of_________________?


a‘crowd’ motion

✖


bangle of swing

✖


c cubic metres

✓


dtravel in metres

✖


View Answer cubic metres

_________________method of starting a three phase induction motor needs six terminals ?


a Star-delta

✓


bResistance starting

✖


cAuto-transformer

✖


d None of the above

✖


View Answer Star-delta

Which of the following is essentially needed while selecting a motor ?


aPulley

✖


bStarter

✓


cFoundation pedal

✖


dBearings

✖


View Answer Starter

In a paper mill where constant speed is required________________?


asynchronous motors are preferred

✖


bA.C. motors are preferred

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cindividual drive is preferred

✓


dgroup drive is preferred

✖



For blowers which of the following motor is preferred ?


aD.C. series motor

✖


bD.C. shunt motor

✓


cSquirrel cage induction motor

✖


d Wound rotor induction motor

✖


View Answer D.C. shunt motor

Reluctance motor is a________________?


avariable torque motor

✖


blow torque variable speed motor

✖


cself starting type synchronous motor

✓


dlow noise, slow speed motor

✖



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