Change of D.C. excitation of a synchronous motor changes:

Related Mcqs:

For V-curves for a synchronous motor the graph is drawn between:_______________?

A. armature current and power factor B. terminal voltage and load factor C. power factor and field current D. field current and armature current...

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...

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

A. inductor motor torque B. induction generator torque C. synchronous motor torque D. d.c. motor toque E. none of the above...

A synchronous motor has better power factor as compared to that of an equivalent induction motor. This is mainly because?

A. synchronous motor has no slip B. stator supply is not required to produce magnetic field C. mechanical load on the rotor remains constant D. synchronous motor has large airgap...

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...