Electrical Engineering MCQs

Page No. 251

Which of the following motors is non-self starting ?


aD.C. series motor

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bsynchronous motor

✓


cSquirrel cage induction motor

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dWound round induction motor

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View Answer Synchronous motor

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


avaries with power factor

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bvaries with speed

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cvaries with the load

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dremains constant at all loads

✓



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


azero

✓


bone

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ctwo

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dinfinity

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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

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cequal to the supply voltage

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dNone of these

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


aPhase to phase winding resistance

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bStator winding to earthed frame

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cRotor winding to earthed shaft

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d All of the above

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View Answer All of the above

The speed of a synchronous motor:


a increases as the load increases

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bdecreases as the load decreases

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calways remains constant

✓


dnone of the above

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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

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bdirectly opposes it

✓


ccross-magnetises it

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dnone of the above

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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

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bbecome less

✓


cremain constant

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dnone of the above

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View Answer become less

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


aapplied voltage of the motor

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b power factor of power drawn by the motor

✓


cmotor speed

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dnone of the these

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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

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btwo degrees

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cfive degrees

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d ten degrees

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View Answer five degrees

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