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Electrical Machines

Electrical Machines
Hysteresis loss is proportional to

 f1.5.
  f.
 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

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

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Electrical Machines
In travelling cranes for crane travel, trolley and boom hoist which motor is preferred?

  DC differential compound motor.
  Synchronous motor.
  Slip ring induction motor.
  Stepper motor.

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Electrical Machines
A 3-phase 6 pole 50 Hz induction motor is running at 5% slip.What is the speed of the motor?

 950 rpm
 1000 rpm
 900 rpm
 850 rpm

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Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  designing the motor for adequate synchronizing power.
  using a flywheel.
  any of above methods.
  providing damper winding in the rotor pole faces.

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Electrical Machines
Compensating windings is placed in which part of a D.C motor?

None of these
  On yoke in the pole faces.
 On armature.
 On yoke in the inter pole gap.

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MORE MCQ ON Electrical Machines

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