When excitation of one alternator in parallel operation is increased:

Option 1: It supplies more real power

Option 2: It supplies more reactive power

Option 3: Terminal voltage decreases

Option 4: Frequency increases

Correct Option: 2

Explanation

Increasing excitation increases internal EMF, causing the alternator to supply more reactive power (kVAR). Real power remains almost unchanged as it depends on mechanical input.

When excitation of one alternator in parallel operation is increased:

Explanation

In 1-ϕ IM if the slip of motor is S with regard to the forward rotating flux, then its slip with regard to the backward rotating flux will be:

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