If the field circuit of an unloaded salientpole synchronous motor gets suddenly open-circuited, then

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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 maximum power developed in a synchronous motor occurs at a coupling angle of____________?

A. 30° B. 60° C. 90° D. 180°...

When the voltage applied to a synchronous motor is increased, which of the following will reduce?

A. Stator flux B. Pull in torque C. Both A. and (b) D. None of the above...

In a synchronous motor, damper windings are provided on____________?

A. stator frame B. rotor shaft C. pole faces D. none of the above...