In a normal combustion in a diesel engine, injection starts about ____ degrees BTDC

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Multiple Choice

In a normal combustion in a diesel engine, injection starts about ____ degrees BTDC

Explanation:
In diesel engines, fuel is injected before the piston reaches top dead center to give time for atomization and mixing with the hot compressed air. This advance allows ignition to occur just after the start of combustion, producing a smooth and efficient pressure rise as the fuel burns. If injection starts at or after TDC, there isn’t enough time for proper mixing and the combustion process can be late, leading to higher peak pressures later in the stroke, rough operation, and reduced efficiency. So the correct choice is the one that indicates injection begins a small amount before TDC.

In diesel engines, fuel is injected before the piston reaches top dead center to give time for atomization and mixing with the hot compressed air. This advance allows ignition to occur just after the start of combustion, producing a smooth and efficient pressure rise as the fuel burns. If injection starts at or after TDC, there isn’t enough time for proper mixing and the combustion process can be late, leading to higher peak pressures later in the stroke, rough operation, and reduced efficiency. So the correct choice is the one that indicates injection begins a small amount before TDC.

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