Electrical Engineering MCQs

Page No. 251

Which of the following motors is non-self starting ?


aD.C. series motor


bsynchronous motor


cSquirrel cage induction motor


dWound round induction motor


View Answer Synchronous motor

The magnitude of field flux in a 3-phase synchronous motor?


avaries with power factor


bvaries with speed


cvaries with the load


dremains constant at all loads



The ratio of starting torque to running torque in a synchronous motor is____________?


azero


bone


ctwo


dinfinity


View Answer zero

The induced e.m.f. in a synchronous motor working on leading power factor will be_____________?


amore than the supply voltage


b less than the supply voltage


cequal to the supply voltage


dNone of these



Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?


aPhase to phase winding resistance


bStator winding to earthed frame


cRotor winding to earthed shaft


d All of the above


View Answer All of the above

The speed of a synchronous motor:


a increases as the load increases


bdecreases as the load decreases


calways remains constant


dnone of the above



When a 3-phase synchronous generator is supplying a zero power factor lagging load, the armature field affects the main field in the following way


aaugments it directly


bdirectly opposes it


ccross-magnetises it


dnone of the above


View Answer directly opposes it

If in a synchronous motor, driving mechanical load and drawing current at lagging power factor from constant voltage supply, its field excitation is increased, then its power factor__________?


abecome more


bbecome less


cremain constant


dnone of the above


View Answer become less

Change of D.C. excitation of a synchronous motor changes:


aapplied voltage of the motor


b power factor of power drawn by the motor


cmotor speed


dnone of the these



The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?


a zero degree


btwo degrees


cfive degrees


d ten degrees


View Answer five degrees

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