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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
 above rated speed
 below rated speed
None of these

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Electrical Machines
A DC compound motor has

 only series field winding.
 both shunt and series field winding.
 only shunt field winding.
 tertiary winding.

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Electrical Machines
Induction motor operation depends on

None of these
 rotating magnetic field.
 either of these.
 stationary magnetic field.

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
  zero starting torque.
 starting torque equal to full-load torque.
 high starting torque.

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Electrical Machines
The interpoles in dc machines have a tapering shape in order to

 reduce the saturation in the interpole
 economise on the material required for interpoles and their windings
 increase the acceleration of commutation
 reduce the overall weight

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

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

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