Synchronous Motors
The pull out torque of a synchronous motor will ______ as the field excitation is increased.

Increase
Remain unchanged
None of the listed here
Decrease

ANSWER DOWNLOAD EXAMIANS APP

Synchronous Motors
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

leading power factor with under-excitation
no change of power factor
lagging power factor with over-excitation
leading power factor with over-excitation

ANSWER DOWNLOAD EXAMIANS APP

Synchronous Motors
The power factor of a synchronous motor is better than that of induction motor because

mechanical load on the motor can be adjusted
stator supply is relieved of responsibility of producing magnetic field
synchronous motor runs at synchronous speed
synchronous motor has large air gap

ANSWER DOWNLOAD EXAMIANS APP