Discussion
Manifold pressure is 24 inches of mercury while ambient is 29.9. The depression below ambient is
Answer: C
Correct answer: 5.9 inches
The depression is the amount by which manifold pressure lies below ambient:
\[ 29.9 - 24 = 5.9\ \text{inches of mercury} \]
It arises because the throttle butterfly restricts the induction flow, so the manifold sits below atmospheric at any setting short of fully open. At full throttle on a normally aspirated engine the depression falls nearly to zero and manifold pressure approaches ambient, which is why maximum available manifold pressure falls steadily with altitude unless the engine is supercharged.
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