Allied & ICAR Exam Bank • ALLIED_1111 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Otto Cycle

Question Statement:

An ideal air-standard Otto cycle operates with a compression ratio $r = 8$. Taking $\gamma = 1.4$, the thermal efficiency of the Otto cycle (in %) is:

Answer Key:

56.5

Step-by-Step Solution & Explanation

$\eta_{Otto} = 1 - \frac{1}{r^{\gamma-1}} = 1 - \frac{1}{8^{0.4}} = 1 - \frac{1}{2.3003} = 1 - 0.4352 = 0.5648$ or $56.48\%$.
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