Electrical Engineering MCQs

Page No. 38

The diameter of the rotor shaft for an electric motor depends on which of the following ?


a r.p.m. only


bHorse power only


cHorse power and r.p.m.


dHorse power, r.p.m. and power factor



In series motor which of the following methods can be used for changing the flux per pole ?


a Tapped field control


bDiverter field control


cSeries-parallel control


dAny of the above


View Answer Any of the above

For which of the following applications motor has to start with high acceleration ?


aOil expeller


bFloor mill


cLifts and hoists


dCentrifugal pump


View Answer Lifts and hoists

Which of the following happens when star-delta starter is used ?


aStarting voltage is reduced


bStarting current is reduced


c Both A. and B.


dNone of the above


View Answer Both A. and B.

Which of the following motors is preferred when smooth and precise speed control over a wide range is desired ?


a D.C. motor


b Squirrel cage induction motor


cWound rotor induction motor


dSynchronous motor


View Answer D.C. motor

Which of the following motors is preferred for boom hoist of a travelling crane ?


aSingle phase motor


bSynchronous motor


c A.C. slip ring motor


dWard-Leonard controlled D.C. shunt motor



The capacity of a crane is expressed in terms of_______________?


a type of drive


bspan


ctonnes


dany of the above


View Answer tonnes

Which of the following motors is preferred when quick speed reversal is the main consideration ?


aSquirrel cage induction motor


b Wound rotor induction motor


cSynchronous motor


dD.C. motor


View Answer D.C. motor

A pony motor is used for the starting which of the following motors ?


aSquirel cage induction motor


bSchrage motor


cSynchronous motor


dNone of the above


View Answer Synchronous motor

Besides a constant speed a synchronous rotor possesses which of the following advantages ?


aLower cost


bBetter efficiency


cHigh power factor


dAll of the above


View Answer High power factor

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