Electrical Engineering MCQs

Page No. 246

Slip rings are usually made of__________?


acarbon or graphite


bbrass or steel


c silver or gold


dcopper or aluminium


View Answer brass or steel

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?


asynchronous motor has no slip


bstator supply is not required to produce magnetic field


cmechanical load on the rotor remains constant


dsynchronous motor has large airgap



Synchronous motors are_____________?


anot-self starting


b self-starting


cessentially self-starting


dnone of the above


View Answer not-self starting

Synchronsizing power of a synchronous machine is_____________?


adirecly proportional to the synchronous reactance


b inversely proportional to the synchronous reactance


cequal to the synchronous reactance


dnone of the above



When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor___________?


a remains same as the original value


bdecreases to half the original value


ctends to becomes zero


d increases to two times the original value



When load on an over-excited or under excited synchronous*motor is increased, rate of change of its armature current as compared with that of power factor is___________?


amore


bless


cequal


dtwice


View Answer less

Riunting in a synchronous motor takes place___________?


awhen supply voltage fluctuates


bwhen load varies


cwhen power factor is unity


dmotor is under loaded


View Answer when load varies

The percentage slip in case of a synchronous motor is____________?


a1%


b100%


c0.5%


dzero


View Answer zero

When the field of a synchronous motor is under-excited, the power factor will be____________?


aleading


blagging


cunity


dzero


View Answer lagging

The oscillations in a synchronous motor can be damped out by_______________?


amaintaining constant excitation


b running the motor on leading power factors


cproviding damper bars in the rotor pole faces


doscillations cannot be damped



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