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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 44 A.
 400 A.
 440 A.
 40 A.

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

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

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Electrical Machines
Direction of the current in the compensating winding is________ to the direction of current in the armature conductors?

 exactly opposite
 same
None of these
 either of these

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Electrical Machines
The current drawn by a DC motor at the time of starting is

 Zero.
 Very low.
 Normal.
 Very high.

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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is

 lagging
 unity
 leading
 zero

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Electrical Machines
Stray losses in transformer occurs in

  winding conductors and steel structures of transformer.
 steel core.
 transformer insulating oil.
 paper insulation in transformers.

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