Electrical Machines
DC generator will not build up voltage

  if it has lost residual magnetism.
 if field resistance is more than critical resistance.
 any one of above.
 due to wrong direction of rotation.

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Electrical Machines
Two DC generators having equal open-circuit emfs but slight different load characteristics are operating in parallel, then

 the machine with more drooping characteristic will supply more load.
  the machine will share load equally.
  the machine with more drooping characteristic will supply less load.
None of these

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