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____________?

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 oscillations in a synchronous motor can be damped out by_______________?

A. maintaining constant excitation B. running the motor on leading power factors C. providing damper bars in the rotor pole faces D. oscillations cannot be damped...

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...