GENERAL KNOWLEDGE

Detailed explanation-1: -A gasoline engine takes a mixture of gas and air, compresses it, and ignites the mixture with a spark. A diesel engine takes air, compresses it, and then injects fuel into the compressed air. The heat of the compressed air ignites the fuel spontaneously.

Detailed explanation-2: -In a compression-ignited system, the diesel fuel is injected into the combustion chamber of the engine and ignited by the high temperatures achieved when the gas is compressed by the engine piston.

Detailed explanation-3: -A diesel engine draws only air during the suction stroke. The pressure at the end of the compression is about 10 kg/cm2. The pressure at the end of the compression is about 35 kg/cm2. The charge (i.e. petrol and air mixture) is ignited with the help of spark plug.

Detailed explanation-4: -Diesel engines are sometimes called compression-ignition engines because initiation of combustion relies on air heated by compression rather than on an electric spark. In a diesel engine, fuel is introduced as the piston approaches the top dead centre of its stroke.

Detailed explanation-5: -Higher compression also makes the fuel burn more completely, releasing more energy because diesel fuel yields a higher energy density. Also, a diesel’s unique ability to inject fuel for a longer portion of the power stroke helps create a higher average cylinder pressure than a comparable gasoline engine.