Due to which of the following reasons a synchronous motor fails to pull into synchronism after applying D.C. field current?

Related Mcqs:

Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?

A. Phase to phase winding resistance B. Stator winding to earthed frame C. Rotor winding to earthed shaft 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...

A synchronous motor can operate at____________?

A. lagging power factor only B. leading power factor only C. unity power factor only D. lagging, leading and unity power factors...

When the voltage applied to a synchronous motor is increased, which of the following will reduce?

A. Stator flux B. Pull in torque C. Both A. and (b) D. None of the above...

The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as___________?

A. pull-up torque B. pull-in torque C. pull-out torque D. none of the above...