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Electrical Machines

Electrical Machines
Field weakening control method is used for the _________ ?

 above rated speed
 both A and B
 below rated speed
None of these

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Electrical Machines
Wave winding is employed in DC machine of

  low current and high voltage rating.
 low current and low voltage rating.
 high current and low voltage rating.
 high current and low voltage rating.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 0 .001 %.
None of these
 3 %.
  3.33 %.

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Electrical Machines
Example of double excited machine is

 Synchronous motor.
 Both are correct.
 DC Shunt Motor
None of these

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Electrical Machines
The speed of a 50 Hz three phase induction motor under full load condition is 725 rpm the number of poles of the motor are ______________.

 4.
  2.
 6.
  8.

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Electrical Machines
A crusher is equipped with

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

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