Synchronous motors are_____________?

Related Mcqs:

The mechanical displacement of the rotor with respect to the stator, in polyphase multipolar synchronous motors running at full load, is of the order of_____________?

A. zero degree B. two degrees C. five degrees D. ten degrees...

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_____________?

A. no change of power factor B. lagging power factor with over-excitation C. leading power factor with under-excitation D. leading power factor with over-excitation...

The operating speed of a synchronous motor can be changed to new fixed value by___________?

A. changing the load B. changing the supply voltage C. changing frequency D. using brakes...

Power factor of a synchronous motor is unity when_____________?

A. the armature current is maximum B. the armature current is minimum C. the armature current is zero D. none of the above...

In a synchronous motor, V-curves represent relation between____________?

A. armature current and field current B. power factor and speed C. field current and speed D. field current and power factor...