FAA AMT Airframe Practice Exam 2025 – All-in-One Study Guide to Master Aviation Maintenance Technician Certification!

Question: 1 / 1030

A measure of a gasoline's tendency to vapor lock can be obtained from what test?

Octane rating test

Compression test

Reid vapor pressure test

The correct answer is C. Reid vapor pressure test. This test measures the vapor pressure of gasoline, which is the pressure at which gasoline will vaporize at a given temperature. A high vapor pressure indicates that the gasoline is more likely to vaporize and create vapor lock in the fuel system of an aircraft.

Option A, the octane rating test, measures the gasoline's resistance to knocking in an engine but is not directly related to its tendency to vapor lock. Option B, the compression test, is used to evaluate the condition of an engine's cylinders and valves, not gasoline. Option D, the hydrocarbon test, is a test for the presence of hydrocarbons in aviation fuel and is not specifically related to vapor lock tendency.

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Hydrocarbon test

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