Understanding Compression Ignition Engines

Which of the following is a type of compression ignition engine?

• Spark Ignition Engine

• Diesel Engine

• Gasoline Engine

• Rotary Engine

What is one of the main advantages of compression ignition engines over spark ignition engines?

• Higher fuel consumption

• Lower thermal efficiency

• Higher thermal efficiency

• More complex design

In a compression ignition engine, what initiates the combustion process?

• Spark plug

• High voltage current

• Compressed air temperature

• External heat source

Which of the following fuels is commonly used in compression ignition engines?

• Petrol

• Diesel

• Kerosene

• Ethanol

What is the primary working principle of a compression ignition engine?

• Fuel is ignited by a spark

• Fuel is ignited by heat of compressed air

• Fuel is ignited by an external flame

• Fuel is ignited by a chemical reaction

Which of the following is a benefit of using diesel fuel in compression ignition engines?

• Lower energy density

• Higher energy density

• Higher volatility

• Lower cetane number

What is the typical compression ratio range for a diesel engine?

• 6:1 to 10:1

• 10:1 to 15:1

• 15:1 to 25:1

• 25:1 to 30:1

Which of the following statements is true about the efficiency of compression ignition engines?

• They are less efficient than spark ignition engines

• They have the same efficiency as spark ignition engines

• They are more efficient than spark ignition engines

• Efficiency depends solely on the type of fuel used

What is the role of the fuel injector in a compression ignition engine?

• To ignite the fuel

• To compress the air

• To mix air and fuel

• To inject fuel into the combustion chamber

Which of the following is a characteristic of the fuel used in compression ignition engines?

• High octane number

• High cetane number

• Low flash point

• High volatility