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
Armature reaction in a DC machine

  makes an angle of 90° with the main pole axis.
 is in direct opposition to the main poles.
 is in the same direction as the main poles.
 makes an angle with the main pole axis which is load dependent.

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