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What is the term inversely proportional to thermal efficiency?

  • A.Mean piston speed
  • B.Specific fuel consumption
  • C.Specific power output
  • D.Mean effective pressure

Answer: B

Specific fuel consumption is inversely proportional to the thermal efficiency of an engine. Thermal efficiency is the work output divided by the energy of the fuel burnt, and specific fuel consumption is the fuel used per unit of power output, so when more fuel is needed for the same power the efficiency is lower. Mean piston speed, specific power output and mean effective pressure are not inversely proportional to thermal efficiency in this sense.

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