In a diesel engine, air is first compressed to a very high pressure, which raises its temperature significantly. Diesel fuel is then injected into this hot compressed air as a fine spray. The small droplets of diesel quickly vaporize and mix with the hot air, forming a combustible mixture. This mixture then auto-ignites due to the high temperature of the compressed air. While diesel is injected as a liquid spray, it must vaporize and mix with air to combust efficiently. Option A is the most accurate description among the choices, representing the state of the reactants just before and during combustion.
In a diesel engine the fuel used is :
Asked in UPPCS Prelims 1994 · Topic: Heat and Thermodynamics (Modes of Heat Transfer (Conduction, Convection, Radiation))
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