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In oxy-acetylene gas welding, for complete combustion, the volume of oxygen required perunit of acetylene is
  • a)
    1
  • b)
    1.5
  • c)
    2
  • d)
    2.5
Correct answer is option 'D'. Can you explain this answer?
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Understanding Oxy-Acetylene Welding
Oxy-acetylene gas welding is a process that uses a flame produced by burning a mixture of oxygen and acetylene gas. For optimal combustion, the correct ratio of these gases is crucial.
Combustion Requirements
- Complete combustion of acetylene requires a specific amount of oxygen.
- The theoretical volume ratio for complete combustion is 1:1.5 (acetylene to oxygen). However, for practical applications, a higher volume of oxygen is utilized.
Oxygen Requirement
- Acetylene (C₂H₂): It is the fuel gas in the welding process.
- Chemical Reaction: The complete combustion reaction of acetylene can be represented as:
\[ 2C_2H_2 + 5O_2 → 4CO_2 + 2H_2O \]
- From this equation, it indicates that for every 2 volumes of acetylene, 5 volumes of oxygen are required.
Calculating the Ratio
- To determine the volume of oxygen needed per unit of acetylene:
- \[ \text{Oxygen per unit of Acetylene} = \frac{5 \text{ (Oxygen)}}{2 \text{ (Acetylene)}} = 2.5 \]
- Therefore, 2.5 volumes of oxygen are required for every 1 volume of acetylene for complete combustion.
Conclusion
- The correct answer, as per the combustion requirement in oxy-acetylene welding, is 2.5 volumes of oxygen per 1 volume of acetylene, making option 'D' the right choice. This ensures efficient and effective welding with optimal flame temperatures.
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In oxy-acetylene gas welding, for complete combustion, the volume of oxygen required perunit of acetylene isa)1b)1.5c)2d)2.5Correct answer is option 'D'. Can you explain this answer?
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