Diesel
Explanation
The selection of fuel for automotive applications depends on the engine type (spark ignition versus compression ignition) and the specific power and torque requirements of the vehicle. Heavy commercial vehicles require fuels that offer high energy density and the ability to generate significant torque for hauling heavy loads.Analysis of Options:
- Petrol: Incorrect. Petrol is used primarily in light motor vehicles such as cars and motorcycles. Petrol engines use spark ignition and generally produce less torque compared to diesel engines, making them less suitable for heavy-duty haulage.
- Diesel: Correct. Diesel is the primary fuel for heavy commercial vehicles like trucks, tractors, and buses. Diesel engines operate on compression ignition, which allows for a higher compression ratio. This results in greater thermal efficiency and high torque output, which is essential for moving heavy loads.
- Kerosene: Incorrect. Kerosene is mainly used as a fuel for aviation (jet engines), heating, and lighting. It is not suitable for modern internal combustion road vehicles due to its combustion characteristics and lack of lubrication properties required for fuel injection systems.
- LPG: Incorrect. Liquefied Petroleum Gas (LPG) is used as a cleaner alternative fuel for light passenger vehicles and three-wheelers. It does not possess the high energy density or torque characteristics required for heavy commercial transport.
Key Takeaway: Diesel engines provide superior torque and fuel efficiency compared to petrol engines, making diesel the standard fuel for heavy-duty agricultural and industrial transport.