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Electrical Machines

Electrical Machines
In DC generator on no-load, the air gap flux distribution in space is

 triangular.
  sinusoidal.
  flat topped.
  pulsating.

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 40 HZ
 50 Hz
 25 Hz
 60 Hz

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Electrical Machines
which of the following type of brush and their application is/are correct

 electro graphite → large ratings
 copper graphite → low voltage high current density
 carbon brush → normal ratings
All of these

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Electrical Machines
If the mechanical angle α between the stator and rotor poles increases, then the stator current

  Increases.
 None of above.
 Remains unchanged.
 Decreases.

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

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

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

  2 Hz.
  3 Hz.
 10 Hz.
 50 Hz.

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MORE MCQ ON Electrical Machines

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