Electrical Engineering MCQs

Page No. 247

A synchronous motor can operate at____________?


alagging power factor only


b leading power factor only


c unity power factor only


dlagging, leading and unity power factors



If load (or torque) angle of a 4-pole synchronous motor is 6° electrical, its value in mechanical degrees is__________?


a2


b3


c4


d6


View Answer 3

The minimum armature current of the synchronous motor corresponds to operation at______________?


azero power factor leading


bunity power factor


c0.707 power factor lagging


d 0.707 power factor leading


View Answer unity power factor

Synchronous motor always runs at______________?


athe synchronous speed


bless than synchronous speed


cmore than synchronous speed


dnone of the above


View Answer the synchronous speed

Under which of the following conditions hunting of synchronous motor is likely to occur?


aPeriodic variation of load


bOver-excitation


cOver-loading for long periods


dSmall and constant load



A synchronous motor is running on a load with normal excitation. Now if the load on the motor is increased


a power factor as well as armature current will decrease


bpower factor as well as armature current will increase


cpower factor will increase but armature current will decrease


dpower factor will decrease and armature current will increase



As the load is applied to a synchronous motor, the motor takes more armature current because


athe increased load has to take more current


bthe rotor by shifting its phase backward causes motor to take more current


cthe back e.m.f. decreases causing an increase in motor current


dthe rotor strengthens the rotating field casuing more motor current



The power developed by a synchronous motor will be maximum when the load angle is____________?


azero


b45°


c90°


d120°


View Answer 90°

A synchronous motor can be started by________?


apony motor


bD.C. compound motor


cproviding damper winding


dany of the above


View Answer any of the above

A pony motor is basically a_________?


asmall induction motor


bD.C. series motor


cD.C. shunt motor


ddouble winding A.C./D.C. motor


View Answer small induction motor

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