Question Bank • QB_SUB_FP_CMP_002 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Engine components

Question Statement:

A four-stroke single-cylinder diesel engine has a piston diameter of $100\text{ mm}$ and stroke length of $120\text{ mm}$. If the clearance volume is $50\text{ cm}^3$, the compression ratio of the engine is:

Answer Key:

19.85

Step-by-Step Solution & Explanation

Swept volume: $V_s = \frac{\pi}{4} D^2 L = \frac{\pi}{4} (10)^2 \times 12 = 942.48\text{ cm}^3$ Compression ratio: $r = \frac{V_s + V_c}{V_c} = \frac{942.48 + 50}{50} = \frac{992.48}{50} = 19.85$
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