Electrical Machines
Flashing of DC generator means

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

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Electrical Machines
In a DC machine

 current and emf in armature are alternating.
 current and emf in armature are unidirectional
 emf in armature conductors and at the terminals is alternating.
 current and emf at the terminals are alternating.

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Electrical Machines
In the 3-phase induction motor, the resultant flux is of a constant nature and is

 3/2 times maximum value of flux due to any phase
 1/2 times maximum value of flux due to any phase
 equal to φm, where φm is the maximum flux due to any phase
 3 times maximum value of flux due to any phase

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