Electrical Machines
In synchronous motor, the damper winding is generally used to

  reduce noise level only.
  provide starting torque only.
  prevent hunting and provide the starting torque.
  reduce the eddy currents.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
With the increase in speed of a DC motor

 back emf falls and line current increases.
 both back emf as well as line current fall.
 back emf increases but line current falls.
 both back emf as well as line current increase.

ANSWER DOWNLOAD EXAMIANS APP