Electrical Engineering MCQs

Page No. 250

In a synchronous motor, the maximum power developed depends on all of the following except:


arotor excitation


bmaximum value of coupling angle


cdirection of rotation


dsupply voltage


View Answer direction of rotation

The effect of increasing the load on a synchronous motor running with normal excitation is to___________?


adecrease both armature current and power factor


bdecrease armature current but increase power factor


cincrease armature current but decrease power factor


d increase both its armature current and power factor



In a synchronous motor, the magnitude of stator back e.m.f. Eb depends on___________?


aload on the motor


bd.c. excitation only


cboth the speed and rotor flux


d none of the above


View Answer d.c. excitation only

Hunting in a synchronous motor cannot be due to___________?


awindage friction


bvariable load


cvariable frequency


dvariable supply voltage


View Answer windage friction

A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have_____________?


ano change of power factor


b lagging power factor with over-excitation


c leading power factor with under-excitation


dleading power factor with over-excitation



A synchronous motor develops maximum power when load angle is____________?


a45°


b 60°


c90°


d120°


View Answer 90°

The armature current of the synchronous motor


a has large values for low excitation i niy


b has large values for high excitation only


chas large values for low and high excitation


dany of the above



Exciters of synchronous machines are______________?


ad.c. series machines


bd.c. shunt machines


cd.c. compound machines


dany of the above


View Answer d.c. shunt machines

The duration of sudden snort-circuit test on a synchronous motor is usually about_____________?


aone hour


bone minute


cone second


d none of the above


View Answer one second

The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as_____________?


aslip torque


bpull-out torque


cbreaking torque


dsynchronising torque


View Answer synchronising torque

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