Question Bank • QB_EXP_FP_CYC_005 NAT • 2 Marks

Section 3: Farm Power

Sources of Power

Subtopic: Thermodynamic cycles of IC engines

Question Statement:

Referring to the Diesel cycle P-v diagram, fuel injection ceases at $6\%$ of the stroke. If the compression ratio is $18.0$, calculate the cut-off ratio $r_c = V_3/V_2$ of the cycle (round off to two decimal places).

Answer Key:

2.02

Step-by-Step Solution & Explanation

Cut-off volume $V_3 = V_2 + 0.06 V_s$. $r_c = \frac{V_3}{V_2} = 1 + 0.06 \frac{V_s}{V_c} = 1 + 0.06 (r - 1)$. For $r = 18$: $r_c = 1 + 0.06 (18 - 1) = 1 + 0.06(17) = 1 + 1.02 = 2.02$.
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