How many strokes does a piston make in a four-stroke Diesel engine?

How many strokes does a piston make in a four-stroke Diesel engine?

• A. Two
• B. Three
• C. Four
• D. Five

Answer: (C)

In a four-stroke Diesel engine, the piston completes four distinct strokes during one full operational cycle. These strokes include the intake stroke, compression stroke, power stroke, and exhaust stroke. 1. **Intake Stroke**: The piston moves down the cylinder, creating a vacuum that draws in air. 2. **Compression Stroke**: The piston moves back up, compressing the air within the cylinder, which raises the temperature. 3. **Power Stroke**: As fuel is injected into the highly compressed air, it ignites, causing a rapid expansion of gases that pushes the piston down. 4. **Exhaust Stroke**: The piston moves back up once more to push the spent gases out of the cylinder. Each of these strokes corresponds to a specific phase in the engine's operation, making it essential for the four-stroke cycle to function properly. In contrast, other types of engines, like two-stroke engines, complete their cycle in just two strokes, and therefore do not utilize the same mechanism as the four-stroke Diesel engine.

In a four-stroke Diesel engine, the piston completes four distinct strokes during one full operational cycle. These strokes include the intake stroke, compression stroke, power stroke, and exhaust stroke.

1. Intake Stroke: The piston moves down the cylinder, creating a vacuum that draws in air.

2. Compression Stroke: The piston moves back up, compressing the air within the cylinder, which raises the temperature.

3. Power Stroke: As fuel is injected into the highly compressed air, it ignites, causing a rapid expansion of gases that pushes the piston down.

4. Exhaust Stroke: The piston moves back up once more to push the spent gases out of the cylinder.

Each of these strokes corresponds to a specific phase in the engine's operation, making it essential for the four-stroke cycle to function properly. In contrast, other types of engines, like two-stroke engines, complete their cycle in just two strokes, and therefore do not utilize the same mechanism as the four-stroke Diesel engine.