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Electrical Machines

Electrical Machines
A transformer has maximum efficiency at 3/4 load. The ratio of iron loss and full load copper loss is

 3/4.
 16/9.
 4/3.
 9/16.

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Electrical Machines
If the temperature of armature resistance is increased, the speed of a series motor would

 decrease.
 None of above.
 not change.
 increase.

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Electrical Machines
In which of the following, voltage regulation may be zero or negative

 leading power factor
 unity power factor
 lagging power factor
All of these

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Electrical Machines
The torque developed in IM is nearly proportional to

  V.
  1 / V.
 1 / V2.
  V2.

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

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

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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?

  data provided is insufficient.
  4.
 6.
  2.

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