AG Mechanics CDE Practice Exam 2025 – The Comprehensive All-in-One Guide for Success

Question: 1 / 400

The acetylene cylinder valve is never opened more than

One full turn

One-quarter turn

One-eighth turn

Half turn

The reason for this is that the acetylene gas inside the cylinder is highly flammable and can ignite easily if exposed to air. By limiting the number of turns, it reduces the chance of gas leaks and potential danger. One full turn (Option A) would open the valve too much, allowing a larger amount of gas to escape. One-quarter turn (Option B) and one-eighth turn (Option C) may not be enough to effectively open the valve. Ultimately, a half turn (Option D) is the safest option as it provides enough space to open the valve while also minimizing the risk of accidents.

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