Which statement about supercharging effect on density is true?

• A. It increases density of the intake charge.
• B. It decreases density of the intake charge.
• C. It has no effect on density.
• D. It only increases density at sea level.

Answer: (A)

Supercharging increases the density of the intake charge by compressing the incoming air and raising its pressure before it enters the cylinders. Density is mass per unit volume, so packing more air molecules into the same space means more air mass in each intake stroke. That denser charge allows more fuel to be burned and yields more power. The boost raises air density relative to ambient pressure, and this effect isn’t limited to sea level—it's about the amount of pressure you add. Cooler air from intercooling can make the density even higher. The other statements don’t fit because reducing density, having no effect, or being limited to sea level doesn’t describe what boosting accomplishes.