Discussion
Manifold absolute pressure in a piston engine indicates
Answer: B
Correct answer: Absolute pressure in the manifold
Manifold absolute pressure is exactly what the name says: the absolute pressure of the charge in the induction manifold, downstream of the throttle. Being absolute, it is referenced to vacuum rather than to ambient, which is why the gauge reads ambient pressure with the engine stopped rather than zero.
That reading is a useful serviceability check before start. In flight the quantity matters because it fixes the mass of charge each cylinder receives, and therefore, with rpm, the power the engine is developing. Compression pressure and exhaust back pressure are quite separate quantities, and no manifold gauge measures a difference across the throttle.
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