Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 damping torqe.
 both 1 and 2.
 eddy current torque.
 no torque.

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Electrical Machines
The synchronous motor can be started by

  any of the above methods.
  providing damper winding in its rotor circuit.
  coupling it with a DC compound motor.
  coupling it with a small AC induction motor called the pony motor.

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Electrical Machines
In a transformer

 OC test is conducted on HV side and SC test is conducted on LV side
 both OC and SC tests are conducted on LV side
 both Oc and SC tests are conducted on HV side
 OC test is conducted on LV side and SC test is conducted on HV side

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