Electrical Machines
If the armature electric current is increased to double its previous value, and the time of commutation is halved, how will the reactance voltage vary?

  It will be doubled.
  It will becomes four times.
 It will remain the same.
  It will be halved.

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Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

 All of above.
 Very fine speed control over the whole range from zero to normal speed is required.
 The accuracy in speed control is required.
 The speed in both the direction is required.

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Electrical Machines
The coil spam

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

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