GATE ME 2015 Set 2 — Question 56
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Thermodynamics → IC Engines → Otto, Diesel & Dual Cycles
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Question
For the same values of peak pressure, peak temperature and heat rejection, the correct order of efficiencies for Otto, Dual and Diesel cycles is
Correct answer
(B) _(Diesel) _(Dual) ₒₜₜₒ
Solution
Efficiency is defined as . For the same heat rejection (), efficiency depends solely on the heat addition (). Higher heat addition leads to higher efficiency. For the same peak pressure and peak temperature, the Diesel cycle has the highest compression ratio and the largest area under the diagram for heat addition (isobaric process), followed by the Dual cycle, and then the Otto cycle (isochoric process). Therefore, , which implies .
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