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Electrical Machines

Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 less than 90o.
 Greater than 90o.
 90o.
 0o.

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Electrical Machines
Speed of DC motor can be controlled by varying

 its flux oer pole.
 all of these.
 resistance of armature culture.
 applied voltage.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Series motor.
 Cummulative compound motor.
 Shunt motor.
 Differential compound motor.

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Electrical Machines
Which of the following motor is more expensive for same KW output rating ?

 Induction motor.
 Synchronous motor.
 DC Shunt Motor
 AC single phase motor.

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

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

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Electrical Machines
Dissolve gas analysis of transformer oil is carried out to determine

 condition of bushings.
  condition of transformer.
 condition of bushing stud.
 condition of transformer oil.

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