Electrical Machines
Flashing of DC generator means

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

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will stop.
 The motor will run in reverse direction.
 The motor will run at its normal speed in the same direction as before.
 The motor will run much faster in the same direction.

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