Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of rotor resistance.
  Change of supply frequency.
  Change of number of pole.
  Change of supply voltage.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  consists of short-circuited copper bars embedded in the field pole faces.
  are provided in a synchronous motor to make it self starting.
  are provided on the stator for improving power factor.
  both (A) and (B).

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
The coil spam

 can never be equal to pole pitch.
 none of above.
 must be exactly equal to people pitch.
  may or may not be exactly equal to people pitch.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

 Any of the above.
 Connecting an additional resistance in the armature circuit.
 Connecting an additional resistance in stator circuit.
 Connecting an additional resistance in the field circuit.

ANSWER DOWNLOAD EXAMIANS APP