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Three of the following are losses accounted for in the indirect method. The exception is

  • A.the dry flue gas loss
  • B.the loss due to hydrogen in the fuel
  • C.the radiation and convection loss from the boiler shell
  • D.the loss in the feed pump's motor

Answer: D

Correct answer: the loss in the feed pump's motor

The indirect method accounts for the losses in the path from the fuel’s energy to the steam - dry flue gas, hydrogen and moisture, unburnt fuel, radiation and convection, and blowdown. The feed pump’s motor consumes electricity, not the fuel being burned, so its loss belongs to the plant’s auxiliary power account and never appears in the boiler’s heat balance.

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