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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Delta - star
 Delta - delta
 Star - delta
 Star - star

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Electrical Machines
The magnetic field which initially induces emf in the armature in a self excited DC generator is because of

  residual magnetism.
None of these
 armature reaction.
  permanent magnets.

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Electrical Machines
A DC series motor is running at rated speed without any additional resistance in series. If an additional resistance is placedin series, the speed of motor

 Increases.
 Oscillates around the rated speed.
 Remains unchanged.
  Decreases.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 any of the above
 equal to
 less than

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  silicon steel.
  aluminium.
  stainless steel.

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Electrical Machines
Series generators are used in which of the following applications?

 Used as boosters in dc distribution or transmission.
All of these
 Air crafts.
 Arc welding.

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