Which factor affects volumetric efficiency?

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Multiple Choice

Which factor affects volumetric efficiency?

Explanation:
Volumetric efficiency is about how effectively the engine fills its cylinders with air. Since this depends on how dense the intake air is, temperature plays a direct role: cooler air is denser, so more air mass can fill the cylinder on each intake stroke, increasing volumetric efficiency; hotter air is less dense, so less air mass fills the cylinder, lowering it. The other options don’t change how much air the engine can physically draw in per cycle—fuel type affects combustion after the air is in, engine color has no effect on intake, and spark plug wear impacts ignition but not the amount of air entering the cylinder. So temperature is the factor that affects volumetric efficiency.

Volumetric efficiency is about how effectively the engine fills its cylinders with air. Since this depends on how dense the intake air is, temperature plays a direct role: cooler air is denser, so more air mass can fill the cylinder on each intake stroke, increasing volumetric efficiency; hotter air is less dense, so less air mass fills the cylinder, lowering it. The other options don’t change how much air the engine can physically draw in per cycle—fuel type affects combustion after the air is in, engine color has no effect on intake, and spark plug wear impacts ignition but not the amount of air entering the cylinder. So temperature is the factor that affects volumetric efficiency.

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