In oxy-acetylene gas welding equipment, the outside surface of oxygen cylinder is usually painted with colour.

Question

Consider two infinitely long fins made of the same material and exposed to the same convective environment. One fin has a square cross-section of side \(a\), and the other has a circular cross-section of diameter \(d\). Assume \(a = d\). The ratio of the steady-state heat transfer rate from the square fin to that from the circular fin, \(\frac{\dot{Q}_{\text{square}}}{\dot{Q}_{\text{circular}}}\), is:

Answer 1

1. Oxygen Cylinder Identification: The cylinder containing compressed

oxygen is traditionally and internationally painted

Black. Oxygen is a non-flammable gas but is a strong oxidant that supports combustion. It is stored at very high pressures (approx 150 bar).

2. Acetylene Cylinder Identification: The cylinder containing

acetylene gas (the fuel gas) is painted

Maroon (or sometimes Red depending on local standards, though Maroon is the standard industrial code). Acetylene is highly flammable and is stored dissolved in acetone within a porous mass to keep it stable.

3. Why Color Coding Matters: Mixing these up could be fatal. For example:

• Oxygen cylinders have right-hand threads, while fuel gas cylinders like acetylene have left-hand threads (often marked with a notch on the nut).

• The color code provides an immediate visual check before a welder even touches the valves or regulators.
Therefore, for the safety and standardization of the workshop, oxygen cylinders are always associated with the color black.

In oxy-acetylene gas welding equipment, the outside surface of oxygen cylinder is usually painted with colour.

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The Correct Option is B

Solution and Explanation

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