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What is the color of an acetylene cylinder in case of gas welding?

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What is the color of an acetylene cylinder in case of gas welding?

(a) Gray

(b) Black

(c) Maroon

(d) Light blue

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The question is from Welding topic in chapter Metallurgy of Welding, Brazing and Soldering of Engineering Material & Metallurgy

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Correct choice is (c) Maroon

Explanation: For gas welding, a head of oxygen and acetylene are used for the process. Both the gases are stored in separate cylinders. The standard color for oxygen cylinder is black, where the oxygen is stored at a pressure of 125-140 kg/cm^2. The acetylene cylinder has a standard color of maroon and is fitted with a fusible light to avoid the explosion.

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