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Electrical Machines

Electrical Machines
A DC generator can be considered as

 prime mover.
 power pump.
 rectifier.
 rotating amplifier.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

  same.
 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.
 proportionate to MVA rating of transformers.

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Electrical Machines
Dummy coils are used for

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

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  separately excited.
  shunt connected.
 differentially compounded.
  cumulatively compounded.

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Electrical Machines
In dc motors, under leading pole tips flux density will--------?

None of these
 decrease
 either increase or decrease
 increase

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  delta connection.
  star connection.
  V connection.
  zig - zag connection.

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