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The specific fuel consumption of a diesel generator is expressed in

  • A.litres of fuel per hour of running
  • B.kilowatts per litre of the engine's swept displacement
  • C.grams or litres of fuel per kilowatt hour generated
  • D.kilowatt hours per litre of fuel consumed

Answer: C

Correct answer: grams or litres of fuel per kilowatt hour generated

Specific fuel consumption is fuel per unit of energy generated, so it normalises for both the size of the machine and how long it ran, and lets sets of different ratings be compared. A figure in litres per hour says nothing without the load, and kilowatt hours per litre is the inverse - a legitimate measure but not the one the term denotes.

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