What type of engine requires a fuel that ignites by compression?

• A. Gasoline Engine
• B. Diesel Engine
• C. Turbine Engine
• D. Rotary Engine

Answer: (B)

A diesel engine requires a fuel that ignites by compression. This type of engine operates on the principle of compression ignition: air is compressed to a high pressure, resulting in an increase in temperature. When diesel fuel is injected into this highly compressed air, it ignites spontaneously due to the heat generated by the compression. This process is distinct from that of gasoline engines, which use a different ignition method based on a spark plug to ignite a pre-mixed air-fuel mixture.

In contrast, gasoline engines rely on a spark to ignite the fuel-air mixture, while turbine engines utilize a different combustion principle involving continuous fuel injection and a steady flow of air. Rotary engines, although unique in their design and operation, also do not rely on compression ignition like a diesel engine. Understanding these distinctions highlights the significance of compression ignition in diesel engines.