Synchronous Motors
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

By changing the applied voltage
By interchanging any two phases
By changing the supply frequency
By changing the load

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Synchronous Motors
Synchronous capacitor is

An over excited synchronous motor running without mechanical load
An over excited synchronous motor driving mechanical load
None of the listed here
An ordinary static capacitor bank

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Synchronous Motors
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by

induction motor torque in damper winding
All of the listed here
induction motor torque in field winding
eddy current and hysteresis torque in pole faces

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