When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop_________________?

Related Mcqs:

When V is the applied voltage, then the breakdown torque of a synchronous motor varies as_________?

A. V B. V312 C. V2 D. 1/V...

Slip-rings in a synchronous motor carry____________?

A. direct current B. alternating current C. no current D. all of the above...

If one-phase of a 3-phase synchronous motor is short-circuited, motor will ______________?

A. will refuse to start B. will overheat in spots C. will not come upto speed D. will fail to pull into step...

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...