Electrical Machines
A DC shunt generator builds up 230 V when driven in clockwise direction. In case it is driven in anti clockwise direction, other things remaining unchanged, then the voltage build up is

 not possible
 some what less than 230 V
 some what more than 230 V
 230 V

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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.
None of these
 neutralization of residual magnetism.

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