Mechanical Engineering Exam > Mechanical Engineering Notes > Topper Handwritten Notes & Videos for GATE ME > Combustion in C.I Engine or Compression Ignition Engine & Diesel Engine - Internal Combustion Engine
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FAQs on Combustion in C.I Engine or Compression Ignition Engine & Diesel Engine - Internal Combustion Engine - Topper Handwritten Notes & Videos for GATE ME - Mechanical Engineering
| 1. What is a compression ignition engine? |  |
Ans. A compression ignition engine, also known as a C.I engine or diesel engine, is a type of internal combustion engine where the combustion of fuel occurs due to the high temperature and pressure created by compressing the air-fuel mixture in the combustion chamber. Unlike spark ignition engines, which use a spark plug to ignite the fuel, compression ignition engines rely on the heat generated by the compression process to ignite the fuel.
| 2. How does combustion occur in a compression ignition engine? | |
Ans. Combustion in a compression ignition engine occurs in the following steps:
1. Intake Stroke: The piston moves downward, drawing in air into the combustion chamber.
2. Compression Stroke: The piston moves upward, compressing the air to high pressure and temperature.
3. Fuel Injection: Just before the compression stroke ends, fuel is injected into the combustion chamber in a fine spray.
4. Combustion: The high temperature and pressure of the compressed air cause the fuel to ignite spontaneously, resulting in combustion.
5. Power Stroke: The burning fuel expands rapidly, forcing the piston downward and producing power.
6. Exhaust Stroke: The piston moves upward, pushing the exhaust gases out of the combustion chamber.
| 3. What are the advantages of a compression ignition engine? | |
Ans. Some advantages of a compression ignition engine (diesel engine) include:
1. Fuel Efficiency: Compression ignition engines are more fuel-efficient compared to spark ignition engines, as they operate at higher compression ratios.
2. High Torque: Diesel engines produce higher torque, making them suitable for heavy-duty applications like trucks and machinery.
3. Durability: Compression ignition engines are built to withstand higher compression pressures, making them more durable.
4. Lower Fire Hazard: Diesel fuel is less volatile than gasoline, reducing the risk of fire in case of accidents.
5. Availability: Diesel fuel is readily available in most parts of the world, making it convenient for diesel engine owners.
| 4. What are the main differences between a compression ignition engine and a spark ignition engine? | |
Ans. The main differences between a compression ignition engine (diesel engine) and a spark ignition engine are as follows:
1. Ignition Process: Compression ignition engines rely on the heat generated by compressing the air to ignite the fuel, whereas spark ignition engines use a spark plug to ignite the fuel.
2. Fuel Type: Diesel engines use diesel fuel, which is less volatile and has a higher energy density, while spark ignition engines use gasoline.
3. Compression Ratio: Compression ignition engines operate at higher compression ratios compared to spark ignition engines.
4. Efficiency: Compression ignition engines are generally more fuel-efficient due to their higher compression ratios.
5. Application: Compression ignition engines are commonly used in heavy-duty applications like trucks and machinery, while spark ignition engines are more common in passenger cars and motorcycles.
| 5. What are some common applications of compression ignition engines? | |
Ans. Compression ignition engines, or diesel engines, are commonly used in various applications, including:
1. Transportation: Diesel engines are widely used in trucks, buses, locomotives, and ships due to their high torque and fuel efficiency.
2. Construction Equipment: Many construction vehicles and machinery, such as excavators, bulldozers, and cranes, are powered by compression ignition engines.
3. Power Generation: Diesel generators are frequently used for backup power supply in residential, commercial, and industrial settings.
4. Agriculture: Tractors and other agricultural machinery often use diesel engines for their power and durability.
5. Marine: Many boats and ships rely on diesel engines for propulsion and power generation, especially in larger vessels.
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