When load on an over-excited or under excited synchronous*motor is increased, rate of change of its armature current as compared with that of power factor is___________?

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 develops maximum power when load angle is____________?

A. 45° B. 60° C. 90° D. 120°...

The shaft of synchronous motor is made of____________?

A. mild steel B. chrome steel C. alnico D. stainless steel...

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...

The coupling angle or load angle of synchronous motor is defined as the angle between the__________?

A. rotor and stator teeth B. rotor and the stator poles of opposite polarity C. rotor and the stator poles of the same polarity D. none of the above...