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Electrical Machines

Electrical Machines
To eliminate 5th harmonic in the induced voltage phase breadth should be

 18°
 30°
 72°
 36°

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Electrical Machines
Swinburne test is conducted under which of the following condition?

 no load
 full load
 half load
 any of the above

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Electrical Machines
Maximum allowable tan - delta (tanδ) of dielectric dispassion factor of power transformer insulating oil is generally taken as

 3 at 90°C.
  1 at 90°C.
 0.5 at 90°C.
 2 at 90°C.

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Electrical Machines
In a three phase slip-ring induction motor, brushes are connected to

  DC supply.
  equalizing coils.
  external star-connected resistors.
  3 - Φ AC supply.

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Electrical Machines
A 2 KVA transformer has iron loss of 150 W and full load copper loss of 250 W. The maximum efficiency of the transformer would occur when the total loss is

 250 W
 500 W
 400W
 300 W

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
 radiation.
  convection.
 conduction.

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