Question

Which fuel is used in gas welding ?
1. LPG
2. Acetylene
3. Methane
4. Ethylene

Answer 1

Correct Answer - Option 2 : Acetylene

The correct answer is Acetylene.

• Oxyacetylene welding commonly referred to as gas welding, is a process that relies on the combustion of oxygen and acetylene.
  • When mixed in correct proportions within a hand-held torch or blowpipe, a relatively hot flame is produced with a temperature of about 3,200ºC.
• Acetylene gas is shipped in special cylinders designed to keep the gas dissolved.

• LPG (Liquefied petroleum gas) is composed of hydrocarbons containing three or four carbon atoms. The normal components of LPG are propane (C₃H₈) and butane (C₄H₁₀).
• Methane is a significant and plentiful fuel that is the principal component of natural gas.
  • Burning one molecule of methane in the presence of oxygen releases one molecule of CO₂ (carbon dioxide) and two molecules of H₂O (water).
  • Methane can be formed by the decay of natural materials and is common in landfills, marshes, septic systems, and sewers.
• Ethylene is used for ripening of fruits.