FAA AMT Airframe Practice Exam 2026 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

Question: 1 / 1030

What does a reciprocating engine manifold pressure gauge indicate when the engine is not operating?

Zero

The existing atmospheric pressure

Reciprocating engine manifold pressure gauge measures the pressure within the engine's air intake system. When the engine is not operating, there is no pressure being created by the engine. Therefore, the only pressure being measured is the existing atmospheric pressure which is why option B is correct. Option A, zero, is incorrect because a "zero" reading would imply that there is no pressure at all, which is incorrect since there is always atmospheric pressure present. Option C, the maximum pressure, is incorrect because maximum pressure would only be shown when the engine is operating at its peak performance. Option D, the minimum pressure, is incorrect because the minimum pressure would only be shown when the engine is not operating at all. Therefore, option B is the most accurate and useful answer.

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Maximum pressure

Minimum pressure

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