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Electrical Machines

Electrical Machines
Which of the following is the largest conversion device?

 Induction machine
 Synchronous machine
 DC machine
All of these

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Electrical Machines
If the field winding connection of DC shunt motor is changed

 motor will not run.
  It will run in opposite direction.
 motor will become slow.
 It will run in same direction.

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Electrical Machines
When excitation is increased (over excitation), the synchronous generator operates at

 leading power factor.
 any of the above.
 lagging power factor.
 unity power factor.

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Electrical Machines
What is the actual arrangement of series wound generator?

 Armature winding is in series with load.
 Armature and field both are parallel.
  Armature and field both are in series with the load.
 Armature and field both are connected.

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Electrical Machines
In a Dc generator the magnetic neutral axis coincide with geometrical neutral axis, when

  the generator runs on overload.
  the generator runs on full load.
  there is no load on the generator.
  the generator runs on designed speed.

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Electrical Machines
Swinburne's test is applicable to

 DC compound motor.
 DC shunt and level Compound motor.
 DC Shunt motor.
 DC series motor.

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