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 Multiple Choice QuestionsMultiple Choice Questions

271.

The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

  • 26.8%

  • 20%

  • 12.5%

  • 6.25%


A.

26.8%

Efficiency of ideal heat engine,

η = 1-T2T1

Sink temperature, T2 = 100oC = 100 + 273 = 373 K
Source temperature, T1 = 0o C = 0 + 273 = 273 K

Percentage efficiency,

%η = 1-T2T1 x 100= 1-273373 x 100 - 100373 x 100 = 26.8%