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Before starting the engine the MAP gauge of an engine at sea level should indicate aboutQuestion 4Select one:a.15 inHgb.30 inHgc.1013 inHgd.0 inHg

Question

Before starting the engine the MAP gauge of an engine at sea level should indicate aboutQuestion 4Select one:a.15 inHgb.30 inHgc.1013 inHgd.0 inHg

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Solution

The correct answer is b. 30 inHg. Before starting the engine, the Manifold Absolute Pressure (MAP) gauge of an engine at sea level should indicate about 30 inHg. This is because at sea level, the standard atmospheric pressure is approximately 29.92 inHg, which is rounded off to 30 inHg for practical purposes. The MAP gauge measures the absolute pressure in the intake manifold of the engine, which should be equal to the atmospheric pressure when the engine is not running.

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