A synchronous motor can operate at____________?

Related Mcqs:

An important advantage of a synchronous motor over wound round induction motor is that

A. its power factor may be varied at will B. its speed is independent of supply frequency C. its speed may be controlled more easily D. none of the above...

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...

The percentage slip in case of a synchronous motor is____________?

A. 1% B. 100% C. 0.5% D. zero...

If excitation of a synchronous motor running with a constant load is decreased from its normal value, ignoring effects of armature reaction, it leads to____________?

A. increase in both armature current and power factor angle B. increase in back e.m.f. but decrease in armature current C. increase in both armature current and power factor which is lagging D. increase in torque angle but decrease in back e.m.f....