In an alternator, if the load power factor changes from lagging to leading, the armature reaction effect shifts from:

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  1. demagnetising to magnetising
  2. magnetising to cross-magnetising
  3. cross-magnetising to demagnetising
  4. demagnetising to cross-magnetising

Answer (Detailed Solution Below)

Option 1 : demagnetising to magnetising
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Armature Reaction in Alternator

In an alternator, armature reaction refers to the effect of the armature current on the magnetic field of the machine. This interaction results in a distortion of the magnetic field, leading to changes in the terminal voltage

Nature of armature reaction on alternator:

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Power factor

Nature

Unity

Cross-magnetizing

Zero PF lagging

Purely demagnetizing

Zero PF leading

Purely magnetizing

0.8 lagging

Partially cross-magnetizing and partially demagnetizing

0.8 leading

Partially cross-magnetizing and partially magnetizing

 

From the above table, if the load power factor changes from lagging to leading, the armature reaction effect shifts from demagnetising to magnetising.

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