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Electrical Machines

Electrical Machines
Transformer oil is used as

 both A and B.
 an insulator.
 inert medium.
 a coolant.

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Electrical Machines
In 3 - Φ induction motor some times copper bars are placed deep in the rotor to

  reduce copper loss.
  improve power factor.
  improve starting torque.
  improve efficiency.

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

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

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 armature or field connections.
 series field connections.
 armature connections.
 shunt field connections.

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Electrical Machines
In DC generators, the brushes remain in contact with conductors which

 there is no hard and fast rule for this.
 lie in the inter polar gaps.
 lie under north pole.
 lie under south pole.

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Electrical Machines
Which of the following are variable losses?

 eddy current loss
 armature copper loss
 hysteresis loss
 shunt field copper loss

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MORE MCQ ON Electrical Machines

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