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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