Question Bank • QB_FP_023 NAT • 2 Marks

Section 3: Farm Power

Farm Power

Subtopic: Thermodynamic principles of I.C. engines

Question Statement:

A single-cylinder 4-stroke diesel engine has an indicator diagram of area $8.5\text{ cm}^2$ and base length $6.8\text{ cm}$. The indicator spring calibration factor is $80\text{ kPa/mm}$. The indicated mean effective pressure ($p_{imep}$) of the engine in $\text{kPa}$ is ________ (answer in integer).

Answer Key:

1000

Step-by-Step Solution & Explanation

1. Mean diagram height ($h$): $h = \frac{\text{Diagram Area}}{\text{Base Length}} = \frac{8.5\text{ cm}^2}{6.8\text{ cm}} = 1.25\text{ cm} = 12.5\text{ mm}$ 2. Indicated mean effective pressure ($p_{imep}$): $p_{imep} = h \times \text{Spring Scale} = 12.5\text{ mm} \times 80\text{ kPa/mm} = 1000\text{ kPa}$
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