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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

None of these
 both A and B
 variable loss
 constant loss

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Electrical Machines
Dummy coils are used for

 increasing efficiency.
 mechanical balancing.
All of these
 reducing armature reaction.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
  Develop excessive speed and damage itself.
 Open fuse or circuit breaker.
 Draw too much current.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 four.
 two.
 three.
 six.

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Electrical Machines
Breather is provided in a transformer to

 absorb moisture from air entering in transformer.
 provide cold air in transformer.
 filter the transformer oil.
  absorb moisture of air during breathing.

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Electrical Machines
Slot wedges in a dc machine is made up of

 silicon steel.
 fibre.
 mild steel.
 cast iron.

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