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Electrical Machines

Electrical Machines
The breakdown torque of a synchronous motor varies as

 1/V²
 V²
 1/V
 applied voltage V

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Electrical Machines
A lap wound 4 pole dc motor has 460 conductors. Find the number of parallel paths between the conductors?

  4.
 6.
  data provided is insufficient.
  2.

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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
Which of the following statement is true for an AC synchronous motor?

 It is a high reluctance motor.
 It is a variable speed motor.
 It is a step angled motor.
  It is a constant speed motor.

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Electrical Machines
If the excitation is increased, the power factor is

 lagging power factor
None of these
 leading power factor
 unity power factor

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as square of applied voltage
 inversely as applied voltage
None of these
 directly as applied voltage

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