In a 3-phase synchronous motor, the negative phase sequence exists when the motor is_______________?

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...

A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will___________?

A. remain same B. go down C. improve D. none of the above...

If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then_____________?

A. the stator current will be zero B. the stator current will be very small C. the stator current will be very high D. the back e.m.f. will be more than the supply voltage E. none of the above...