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Electrical Machines

Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 94%
 95%
 92%
 96%

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Electrical Machines
Armature coil is short circuited by brushes when it lies

  in none of above positions.
  along neutral axis.
  in any of above positions.
  along field axis.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 remains constant.
 decreases.
 decreases
 increases.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 40 - 400 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
 30000 - 100000 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.

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Electrical Machines
The frequency of voltage generated by an alternator having 8 poles and rotating at 250 rpm is

  25 Hz.
  60 Hz.
  16.67 Hz.
  50 Hz.

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Electrical Machines
Universal motor have which of the following application?

  Domestic pump.
  Traction.
  Food mixer.
  Lift.

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