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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 iron loss
 mechanical loss
 copper loss

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Electrical Machines
The output power of any electrical motor is taken from the

 Motor frame.
 Coupling mounted on the shaft.
 Armature.
 Field.

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Electrical Machines
In a dc machine 6 pole wave winding is used. The number of parallel paths are?

 2
 6
 1
 4

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

 unity
 leading
 zero
 lagging

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Electrical Machines
An induction motor is, in general analogous to

None of these
 auto transformer.
 two winding transformer with secondary short circuited.
 two winding transformer with secondary open circuited.

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Electrical Machines
In a 12 pole triplex lap wound DC armature, each conductor can carry current of 100 A. The rated current of this armature is

 2400 A.
  3600 A.
 1200 A.
 600 A.

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