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Electrical Machines

Electrical Machines
The slot edges in a DC machine are made of

 Cast iron.
  Fibre.
 Mild steel.
 Silicon steel.

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Electrical Machines
In salient pole synchronous machine, maximum power occurs at a load angle of

 0°
 less than 90°
 Greater than 90°
 90°

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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

 300 W
 500 W
 400W
 250 W

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Electrical Machines
The armature of DC motor is laminated

 to reduce the hysteresis loss.
 to reduce the eddy current loss.
 to reduce the inductor.
 to reduce the mass.

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Electrical Machines
Which of the following is/are effects of armature reaction?

 increase the iron loss
 increase the maintenance and repair
 increases the design cost
All of these

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Electrical Machines
Field weakening control method is used for the _________ ?

 below rated speed
 both A and B
None of these
 above rated speed

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