Subtopic: Calculation of power, torque, fuel consumption, heat load and power losses
Question Statement:
An indicator diagram taken from a four-stroke diesel engine cylinder has a net enclosed diagram area of $A_d = 18.0\text{ cm}^2$ and an indicator diagram base length of $L_d = 7.5\text{ cm}$. The indicator spring scale constant is $S = 250\text{ kPa/cm}$. The indicated mean effective pressure ($p_{\text{imep}}$) in $\text{kPa}$ is ________ (answer in integer).
Answer Key:
600
Step-by-Step Solution & Explanation
```
Indicator Diagram Calculation:
Area A_d = 18.0 cm^2
Length L_d = 7.5 cm
Spring Constant S = 250 kPa/cm
```
**Step-by-step Calculation:**
1. Mean ordinate height of indicator diagram ($\bar{h}$):
$\bar{h} = \frac{A_d}{L_d} = \frac{18.0\text{ cm}^2}{7.5\text{ cm}} = 2.40\text{ cm}$
2. Indicated Mean Effective Pressure ($p_{\text{imep}}$):
$p_{\text{imep}} = \bar{h} \times S = 2.40\text{ cm} \times 250\text{ kPa/cm} = 600\text{ kPa}$