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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 1.644 KW.
  2.73 KW.
 0.9103 KW.
 5.46 KW.

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Electrical Machines
A crusher is equipped with

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

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Electrical Machines
In DC generator, lap winding is used in

 where constant speed is required.
  high current and low voltage applications.
 where greater load is connected.
 high voltage and low current applications.

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Electrical Machines
As compared to an induction motor, the air gap in a DC motor is

 same.
 more.
 less than 50%.
 between 50% and 90%.

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Electrical Machines
Which of the following motor has more stability

 salient pole motor
 both motors has same stability
None of these
 cylindrical motor

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Electrical Machines
In a transformer operating at constant voltage if the input frequency increases, the core loss

 decrease.
None of these
 increase.
 remains constant.

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