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Electrical Machines

Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 more.
 between 50% and 90%.
 less than 50%.

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Electrical Machines
In a DC generator, the ripples in the direct emf generated are reduced by employing

  commutator with large number of segments.
 graphite brushes.
  carbon brushes.
  equalizer rings.

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Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 550 VA
 110 VA
 500 VA
 100 VA

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Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Yoke.
  Commutator.
 Brush.
 Armature.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 both 1 and 2.
 excitation.
 frequency.
 load angle.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 both of above.
 DC.
 AC.
None of these

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