For power factor correction, synchronous motors operate at____________?

Related Mcqs:

In case one phase of a three-phase synchronous motor is short-circuited the motor will____________?

A. not start B. run at 2/3 of synchronous speed C. run with excessive vibrations D. take less than the rated load...

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...

If one-phase of a 3-phase synchronous motor is short-circuited, motor will ______________?

A. will refuse to start B. will overheat in spots C. will not come upto speed D. will fail to pull into step...

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....