Discussion
Statement I: A manifold pressure gauge reads ambient pressure with the engine stopped.
Statement II: It measures absolute pressure rather than pressure relative to ambient.
In the light of the above statements, choose the correct answer.
Answer: C
Correct answer: Both Statement I and Statement II are correct
Both are true and the second explains the first. The gauge is referenced to vacuum rather than to ambient, so with the engine stopped and the manifold open to atmosphere through the induction system it reads whatever the ambient pressure happens to be.
That makes a useful pre-start check: the indication should agree with the local altimeter setting. A gauge reading zero or well away from ambient before start is faulty. Once running, the throttle restriction brings the manifold below ambient, and the difference is the depression.
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