text: Question:-
  what is the maximum load at unity power factor which can be delivered by the two machines without overloading any of the machines?
  Option (A)
  23.33 MW
  Option (B)
  13.33MW
  Option(C)
  3.33MW
  Option(D)
  33.33MW
  Correct Option:
  (D)
  Question Solution:
  It is seen that as the frequency drop of the first machine is less, it takes higher load. Therefore the maximum possible total load without overloading either machine is obtained when the first machine is loaded to its rated capacity i.e., 20 MW at unity power factor. The drop of frequency is 2 Hz. Let y be the load of the second machine. Then 2 = (y/20) x 3 or u=(40/3) = 13.33 MW The total load = 20 + 13.33 = 33.33 MW.
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