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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 625 W
 650 W
 700 W

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

  level compound.
  shunt generator.
 series generator.
  short - shunt generator.

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Electrical Machines
In DC generator, the electricity produced in armature is

  AC.
  DC.
  armature is not present in DC generator.
None of these

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

 to carry extra load.
 to interconnect three voltage systems.
  to suppress harmonic and unbalance in voltage.
None of these

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Electrical Machines
Lamination of core are generally made of

 carbon.
 cast iron.
 silicon steel.
 stainless steel.

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Electrical Machines
A short circuit test on a transformer gives

 copper loss at full load.
  copper loss at any load.
 copper loss at half load.
 copper loss at over load.

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