Internal Combustion Engines
Stoichiometric ratio is

None of these
Actual air-fuel ratio for maximum efficiency
Chemically correct air-fuel ratio by volume
Chemically correct air-fuel ratio by weight

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Internal Combustion Engines
In a typical medium speed, 4-stroke cycle diesel engine

Fuel injection starts at just before top dead center and ends just after top dead center
Fuel injection starts at top dead center and ends at 20° after top dead center
Fuel injection starts at 10° before top dead center and ends at 20° after top dead center
May start and end anywhere

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