The operating speed of a synchronous motor can be changed to new fixed value by___________?

Related Mcqs:

The rotor copper losses, in a synchronous motor, are met by____________?

A. d.c. source B. armature input C. motor input D. supply lines...

The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as_____________?

A. slip torque B. pull-out torque C. breaking torque D. synchronising torque...

While starting a synchronous motor by induction motor action, field winding is usually_____________?

A. connected to D.C. supply B. short-circuited by low resistance C. kept open-circuited D. none of the above...

The minimum armature current of the synchronous motor corresponds to operation at______________?

A. zero power factor leading B. unity power factor C. 0.707 power factor lagging D. 0.707 power factor leading...

In a synchronous motor, V-curves represent relation between____________?

A. armature current and field current B. power factor and speed C. field current and speed D. field current and power factor...