Question Bank • QB_FP_033 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Engine components

Question Statement:

In a tractor diesel engine, the piston has a diameter of $D = 100\text{ mm}$. When the piston is at TDC on the power stroke, the peak combustion gas pressure is $P_{\max} = 7.0\text{ MPa}$. The peak axial gas force transmitted to the top of the connecting rod in $\text{kN}$ is ________ (round off to 1 decimal place). Take $\pi = 3.1416$.

Answer Key:

55.0

Step-by-Step Solution & Explanation

1. Piston crown surface area ($A$): $A = \frac{\pi}{4} D^2 = \frac{3.1416}{4} (0.10\text{ m})^2 = 0.007854\text{ m}^2$ 2. Peak gas force ($F_g$): $F_g = P_{\max} \times A = (7.0 \times 10^6\text{ N/m}^2) \times 0.007854\text{ m}^2 = 54,978\text{ N} \approx 55.0\text{ kN}$
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