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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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