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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 0 Hz
 5 Hz
 50 Hz
 1 Hz

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  None of above.
  Closed slots.
  Open slots.
  Semi closed slots.

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

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

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Electrical Machines
Which of the following relation is correct?

 Xd = Xq.
None of these
 Xd < Xq.
 Xd > Xq.

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Electrical Machines
For very sensitive and wide speed control, the preferable control method is

 Multiple voltage control.
 Field control.
 Armature control.
 Ward-Leonard control.

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Electrical Machines
In electric locomotive which of the following motor are used ?

  DC series motor.
  Separately compound motor.
  Shunt motor.
  Synchronous motor.

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