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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

  f.
 f1.5.
 f3.
 f2.

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Electrical Machines
If the no-voltage release in a DC motor starter fails to operate on failure of supply, on resumption of supply the motor will

 not start automatically.
 get damaged.
 start automatically without trouble.
 develop very low starting torque.

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Electrical Machines
In DC generator, lap winding is used in

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

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Electrical Machines
The ventilating ducts in most of DC machine are

 radial as well as longitudinal.
 longitudinal.
 radial.
 none of these.

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Electrical Machines
Field weakening method is also called as-----------?

 constant voltage control
 constant power control
 constant current control
 constant torque control

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Electrical Machines
If an induction machine is run at above the synchronous speed it acts as

 a synchronous motor
 an induction generator
None of these
 an induction motor

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