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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  stainless steel.
  aluminium.
  phosphor bronze.
  carbon.

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

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

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Electrical Machines
The wattage rating of a ceiling fan motor will be

 10 - 20 W.
 250 - 500 W.
  50 - 150 W.
 200 - 250 W.

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Electrical Machines
In a lap winding dc machine number of conductors are 100 and number of parallel paths are 10. Find the average pitch

 50
 10
 100
 1

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Electrical Machines
In a 3 - Φ wound rotor induction motor the short circuit gear is used to short circuit the

  stator phases of the motor.
  starting resistance in the starter.
None of these
  rotor at slip rings.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is

  600 rpm.
  500 rpm.
  3600 rpm.
  3000 rpm.

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