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Electrical Machines

Electrical Machines
The power factor of an induction motor operating at no load will have a value around

 unity
 0.2 lag
 0.2 lead
 0.9 lag

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Electrical Machines
Which of the following statement is correct, if short circuit ratio is high?

None of these
 High voltage regulation
 Good voltage regulation
 Low short circuit current

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to carry extra load.
None of these
  to suppress harmonic and unbalance in voltage.
 to interconnect three voltage systems.

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Electrical Machines
In a DC generator the actual flux distribution depends upon

 size of air gap.
  all of above.
  shape of the pole shoe.
  clearance between tips of the adjacent pole shoes.

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Electrical Machines
Inter pole winding is connected in-------------------------- ?

 series with main poles
 parallel with armature
 parallel with main poles
 series with armature

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Electrical Machines
A 3 - Φ slip ring motor has

  wound rotor.
  any of the above.
  double cage rotor.
  short-circuited rotor.

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