BPSC 63rd Prelims Exam 01 Jul 2018 Solved Paper

Question : 3 of 150

Marks: +1, -0

Gases used in welding are

oxygen and hydrogen
oxygen and nitrogen
oxygen and acetylene
hydrogen and acetylene
None of the above/more than one of the above

Solution:

Gases used in welding are oxygen and acetylene. The most common fuel used in welding is acetylene, which has a two-stage reaction. The primary chemical reaction involves the acetylene disassociating in the presence of oxygen to produce heat, carbon monoxide, and hydrogen gas:

{C}_{2} {H}_{2}+ {O}_{2}→ 2 {CO}+ {H}_{2}

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