Question Bank • QB_EXP_FP_CYC_023 NAT • 2 Marks

Section 3: Farm Power

Sources of Power

Subtopic: Thermodynamic cycles of IC engines

Question Statement:

In the Diesel cycle P-v diagram with $T_2 = 900\text{ K}$, heat is added at constant pressure until temperature $T_3 = 1800\text{ K}$. Compute the cut-off ratio $r_c$ of this cycle (round off to one decimal place).

Answer Key:

2

Step-by-Step Solution & Explanation

For isobaric process $2 \to 3$: $\frac{V_3}{T_3} = \frac{V_2}{T_2} \implies r_c = \frac{V_3}{V_2} = \frac{T_3}{T_2} = \frac{1800}{900} = 2.0$.
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