Allied & ICAR Exam Bank • ALLIED_0241 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Thermodynamic principles of I.C. engines

Question Statement:

An ideal air-standard Otto cycle has compression ratio 8.0. Taking $\gamma = 1.4$, the thermal efficiency in percentage is (rounded off to one decimal place):

Answer Key:

56.5

Step-by-Step Solution & Explanation

$\eta = 1 - 1 / (r^{\gamma - 1}) = 1 - 1 / (8^{0.4}) = 1 - 1 / 2.2974 = 1 - 0.4353 = 56.47\% \approx 56.5\%$.
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