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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

  2.73 KW.
 0.9103 KW.
 1.644 KW.
 5.46 KW.

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Electrical Machines
The heat transfer by convection in a transformer least depends on

  color of the paint.
 temperature difference.
 surface area.
 air velocity.

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Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Armature current.
  Armature voltage.
  Field excitaion.
  Supply voltage.

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

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

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 remain nearly constant
 decrease
 increase gradually and then stay at rated voltage

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Electrical Machines
In a dc machine, the demagnetizing effect of armature reaction is due to

 uneven air-gap length
 non-sinusoidal nature of armature mmf
 component of armature mmf along field axis
 magnetic saturation in half of the field pole

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