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Electrical Machines

Electrical Machines
If we increase the rotor reactance value, the maximum torque will

 not changed
None of these
 increase
 decrease

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

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

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

  the use equalizer in lap winding.
 the use drum winding.
 reactance voltage produced due to communication.
 the use of compensating winding.

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Electrical Machines
A 3 - Φ induction motor draws an current of 50 A from mains when starts by direct switching. If an auto transformer with 60 % tapping is used for starting the current drawn from the mains will be

 36.
  18.
 80.
 50.

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Electrical Machines
A crusher is equipped with

 Synchronous motor.
 Reluctance motor.
 Slip ring induction motor.
 DC shunt motor.

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Electrical Machines
A single-phase transformer has its maximum efficiency at 60 percent of full load. At full load copper loss will be

 zero.
  more than core loss.
 less than core loss.
 equal to core loss.

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MORE MCQ ON Electrical Machines

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