Electrical Machines
Unbalanced supply voltage given to a 3 - φ, delta connected induction motor will cause

  negative sequence current.
  less heating of the rotor.
  less heating of the rotor.
  all of these.

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Electrical Machines
Flashing of DC generator means

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

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