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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  500 to 720.
  375 to 500.
  1440 to 2880.
  720 to 920.

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Electrical Machines
How can the synchronous speed of a 3 - Φ IM be varied?

  By varying number of poles.
  By varying supply voltage.
  By varying the supply frequency.
  Both (A) and (B).

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Electrical Machines
To eliminate the 5th harmonic in the induced voltages their respective pitch factor angle should be

 18°
 30°
 72°
 36°

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Electrical Machines
Find the reactance voltage when current is changed from -2A to 2A in 4 sec and self inductance is 1H?

 1 V
 4 V
 0 V
 2 V

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

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

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Electrical Machines
Under operating conditions the rotor conductor should be _________________ in induction motor.

  always opened.
  semi closed or semi opened.
  none.
  always closed.

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