A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have_____________?

Related Mcqs:

Synchronous motors are generally not self-starting because:

A. the direction of rotation is not fixed B. the direction of instantaneous torque reverses after half cycle C. startes cannot be used on these machines D. starting winding is not provided on the machines...

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...

Mostly, synchronous motors are of_____________?

A. alternator type machines B. induction type machines C. salient pole type machines D. smooth cylindrical type machines...

Which of the following motors will be used in electric clocks?

A. D.C. shunt motor B. D.C. series motor C. A.C. induction motor D. A.C. synchronous motor...

If the field winding of an unloaded salient pole synchronous motor is open circuited, the motor will__________?

A. stop B. run as induction motor C. function as static condenser D. burn with dense smoke...