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Electrical Machines

Electrical Machines
The field divertor resistance for a DC series motor is of order of

 10 Ω
 0.1 Ω
 100 Ω
 50 Ω

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  as small as possible.
  as wide as possible.
  air gap does not matter.
  depends on the material of stator and the rotor.

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

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

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Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 0KVA
 16KVA
 4KVA
 20KVA

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

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

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Electrical Machines
A 500 V, 55 kVA single phase alternator has an effective resistance of 0.5 Ω. An excitation current of 10 A produces 200 A armature current on short circuit and an emf of 450 V on per circuit. The synchronous reactance will be

  2.241 Ω.
 2.781 Ω.
 2.74 Ω.
 25.564 Ω.

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MORE MCQ ON Electrical Machines

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