ASE H1 CNG Engines (Transit Bus) Practice Questions - ASE H1 - Compressed Natural Gas (CNG) Engines (Transit Bus) Certification Exam

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A methane gas detector mounted in the engine compartment of a CNG transit bus repeatedly alarms with no visible leak. Which characteristic of methane should the technician keep in mind during the search?

Methane has a strong natural odor that pinpoints leaks Methane is heavier than air and pools on the floor Methane is lighter than air and collects at the highest points of an enclosure Methane is non-flammable below 50 percent concentration

Correct Answer:

Methane is lighter than air and collects at the highest points of an enclosure

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