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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