The ratio of starting torque to running torque in a synchronous motor is____________?

Related Mcqs:

The induced e.m.f. in a synchronous motor working on leading power factor will be_____________?

A. more than the supply voltage B. less than the supply voltage C. equal to the supply voltage D. None of these...

In a synchronous motor, the magnitude of stator back e.m.f. Eb depends on___________?

A. load on the motor B. d.c. excitation only C. both the speed and rotor flux D. none of the above...

A synchronous motor can be used as a synchronous capacitor when it is____________?

A. under-loaded B. over-loaded C. under-excited D. over-excited...

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 is running with normal excitation. When the load is increased, the armature current drawn by it increases because

A. speed of the motor is reduced B. power factor is decreased C. Eb (back e.m.f.) becomes less than V (applied voltage) D. Er (net resultant voltage) in armature is increased E. none of the above...