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Electrical Machines

Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.1 ohm.
  0.5 ohm.
 50 ohm.
 100 ohm.

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

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

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Electrical Machines
stepped cores are used in transformers in order to reduce

 volume of copper.
 iron loss.
 volume of iron.
 reluctance of core.

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Electrical Machines
Crawling in an induction motor is due to

  time harmonics in supply.
  insufficient starting torque.
  slip ring rotor.
  space harmonics produced by winding currents.

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Electrical Machines
When the excitation of normally operating unloaded, salient pole synchronous motor suddenly gets disconnected, it continues to run as a

 induction motor.
 DC motor.
 switched reluctance motor.
 variable reluctance motor.

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Electrical Machines
Open circuit test on transformer gives

 copper loss
 hysteresis loss
 both 1and 2
 eddy current loss

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