Electrical Machines
Flashing of DC generator means

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

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

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