Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 36.
 80.
 50.
  18.

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Electrical Machines
Flashing of DC generator means

None of these
 neutralization of residual magnetism.
  creation of residual magnetism by a DC source.
  increasing flux density by providing extra ampere-turns in field.

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Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Decrease in speed but armature current remains the same.
  Decrease in speed demanding less armature current.
  Increase in speed but armature currnet remains the same.
  Increase in speed demanding more armature current.

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