If the field of a synchronous motor is underexcited, the power factor will be_____________?

Related Mcqs:

The synchronous motor is not inherently self-starting because_______________?

A. the force required to accelerate the rotor to the synchronous speed in an instant is absent B. the starting device to accelerate the rotor to near synchronous speed is absent C. a rotating magnetic field does not have enough poles D. the rotating magnetic field is produced by only 50 Hz frequency currents...

Hunting in a synchronous motor cannot be due to___________?

A. windage friction B. variable load C. variable frequency D. variable supply voltage...

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...

The torque angle, in a synchronous motor, is the angle between_______________?

A. the supply voltage and the back e.m.f. B. magnetising current and back e.m.f. C. the rotating stator flux and rotor poles D. none of the above...

For power factor correction, synchronous motors operate at____________?

A. no-load and greatly over-excited fields B. no-load and under-excited fields C. normal load with minimum excitation D. normal load with zero excitation...