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The problem is asking for the efficiency of two different engines. The efficiency is defined as:

\[
\text{Efficiency} (\%) = \left( \frac{\text{Output Power}}{\text{Input Power}} \right) \times 100
\]

Let's break it down:

### a) Power generation station:
- Input power = 450,000 MW
- Output power = 95,000 MW

Using the formula:

\[
\text{Efficiency} = \left( \frac{95,000}{450,000} \right) \times 100
\]

### b) Four-stroke diesel engine:
- Input power = 80 kW
- Output power = 22 kW

Using the formula:

\[
\text{Efficiency} = \left( \frac{22}{80} \right) \times 100
\]

I'll now calculate both efficiencies.The efficiencies for the two cases are:

a) Power generation station: \( 21.11\% \)  
b) Four-stroke diesel engine: \( 27.50\% \)

Would you like further details or have any questions?

Here are five related questions to further explore:
1. What factors influence the efficiency of power generation stations?
2. How does the efficiency of diesel engines vary with load?
3. What are common methods to improve engine efficiency?
4. What is the typical efficiency range for power plants using different fuel types?
5. How is energy lost in less efficient engines?

**Tip:** Engine maintenance and operating conditions greatly affect efficiency, making regular

Find the efficiency as a percentage for the following cases: 
1. A power generation station with input power 450,000 MW and output power 95,000 MW. 
2. A four-stroke diesel engine with input power 80 kW (from fuel) and output power 22 kW (brake power).

Learn how to calculate the efficiency of a power generation station and a four-stroke diesel engine using the formula for efficiency percentage. This example involves input and output power, suitable for students in Grades 9-12.

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