Electrical Engineering MCQs

Page No. 41

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


aheavy


bmedium


cnormal


dlow


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


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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