A boost test is used to evaluate which component?

• A. Intake manifold.
• B. Crankcase ventilation.
• C. Fuel filter.
• D. Charge air cooler.

Answer: (A)

A boost test focuses on the intake path to find leaks that would affect how air is delivered to the engine. By pressurizing the intake manifold, any leak in the manifold itself, its gaskets, or the connected hoses will cause pressure to drop or hiss, revealing exactly where air is escaping. This is why the intake manifold is what a boost test evaluates—it's testing the integrity of the air入口 route where leaks would most directly impact boost performance and engine breathing. The other components aren’t the primary targets of a boost test: the crankcase ventilation system is checked mainly for vacuum or pressure integrity in the crankcase, the fuel filter is part of the fuel delivery path and tested differently, and while the charge air cooler can be leak-tested, that typically isn’t the primary purpose of a boost test aimed at the intake manifold.