Electrical Machines
To get the speed of DC motor more than normal without wastage of electrical energy _____________ is used.

 any of above method.
 rheostatic control.
 Ward Leonard control.
 none of above.

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Electrical Machines
An ideal synchronous motor has no starting torque because

 rotor winding is highly reactive.
 relative velocity between the stator and rotor mmf’s is zero.
 rotor is made up of salient poles.
  relative velocity between stator and rotor mmf’s is not zero.

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Electrical Machines
The coil spam

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

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