Discussion
A diesel generator's specific fuel consumption worsens at light load because
Answer: D
Correct answer: the fixed losses are spread over less output
Friction, pumping work and the alternator’s no-load losses continue whatever the load, so at light load those fixed quantities are divided by a small output and the fuel per kilowatt hour rises sharply. A set below about forty per cent load is markedly uneconomic, which is the argument for several smaller sets rather than one large one where the load varies.
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