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Electrical Machines

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

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

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Electrical Machines
When a DC cummulative compound wound motor is loaded

 Torque and speed both increase.
 Both torque and speed decrease.
 Torque decrease and speed increases.
  Torque increase and speed decrease.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  get damaged.
  continue running in the same direction as before.
  run in a direction opposite to previous one.
  not run.

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Electrical Machines
Which of the following motor is used in grinders?

  Split phase IM.
  Synchronous motor.
  Capacitor start IM.
  Capacitor start capacitor run IM.

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Electrical Machines
In single phase rotary converter the number of slip rings will be

 four.
 two.
 three.
 six.

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Electrical Machines
Wave winding is employed in DC machine of

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

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MORE MCQ ON Electrical Machines

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