Mechanical Engineering Exam > Mechanical Engineering Notes > Thermodynamics > Hand Written Notes: Working of a Four and Two Stroke Engine
Hand Written Notes: Working of a Four and Two Stroke Engine | Thermodynamics - Mechanical Engineering PDF Download
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FAQs on Hand Written Notes: Working of a Four and Two Stroke Engine - Thermodynamics - Mechanical Engineering
| 1. How does a four-stroke engine work? |  |
Ans. A four-stroke engine operates through four distinct processes: intake, compression, power, and exhaust. During the intake stroke, the piston moves down, drawing in the air-fuel mixture. In the compression stroke, the piston moves back up, compressing the mixture. The power stroke is when the spark plug ignites the compressed mixture, causing an explosion that drives the piston down. Finally, the exhaust stroke pushes out the remaining gases.
| 2. What is the main difference between a four-stroke and a two-stroke engine? | |
Ans. The main difference between a four-stroke and a two-stroke engine is the number of strokes required to complete a full engine cycle. In a four-stroke engine, it takes four strokes (intake, compression, power, exhaust) to complete a cycle, while in a two-stroke engine, it only takes two strokes (compression/exhaust, intake/power) to complete a cycle.
| 3. How does a two-stroke engine work? | |
Ans. A two-stroke engine operates through two primary processes: compression/exhaust and intake/power. In the compression/exhaust stroke, the piston moves up, compressing the air-fuel mixture and expelling exhaust gases. In the intake/power stroke, the piston moves down, drawing in the new air-fuel mixture and igniting it to generate power.
| 4. What are the advantages of a four-stroke engine over a two-stroke engine? | |
Ans. Some advantages of a four-stroke engine over a two-stroke engine include better fuel efficiency, lower emissions, smoother operation, and longer lifespan. Four-stroke engines also tend to have more torque at lower RPMs compared to two-stroke engines.
| 5. Which type of engine is more commonly used in modern vehicles, a four-stroke or a two-stroke engine? | |
Ans. Four-stroke engines are more commonly used in modern vehicles due to their higher efficiency, lower emissions, and smoother operation. Two-stroke engines are typically found in smaller equipment such as chainsaws, motorcycles, and outboard motors.
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Nov 15, 2024 Last updated |
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