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Keeping its excitation constant, if steam supply of an alternator running in parallel with another identical alternator is increased, then:
1. Its power factor would be decreased
2. It will supply greater portion of the load
3. It would over-run the other alternator
4. Its rotor will fall back in phase with respect to the other machine

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Correct Answer - Option 2 : It will supply greater portion of the load

While keeping the excitation constant, if the steam supply of an alternator running in parallel with another identical alternator is increased

  • If the steam supply of one of the alternators is increased then its power input to the prime mover will also increase.
  • As we know that for parallel operation the speed must be the same for both the alternators, therefore the alternator with greater steam cannot overrun the alternator having the lesser steam supply.
  • The alternator with more steam supply utilizes its increased power to carry more load by advancing its angular position.

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