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Electrical Machines

Electrical Machines
In a single phase induction motor, the starting torque developed is proportional to

 supply voltage V
 1/V
 V²
 1/V²

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Electrical Machines
Which of the DC Motor use flywheel?

 Differently compared motor.
 Shunt motor.
 Series motor.
 Cumulatively compound motor.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant hp drive below the base speed.
 constant torque drive below the base speed.
 constant torque drive above the base speed.
 constant power drive above base speed.

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Electrical Machines
Iron losses in a DC machine are independent of variation in

  load.
 speed.
  speed and voltage.
  voltage.

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Electrical Machines
Which of the following DC motors has got maximum relieving property?

  Series.
 Cummulative compound.
 Shunt.
 Differentical compound.

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce eddy current loss only.
 reduce both eddy current and hysteresis loss.
 increase the permeability.
 reduce hysteresis loss only.

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