\begin{tabular}{|l|l|}
Q.26 & $\begin{array}{l}\text { A packed distillation column, with vapor having an average molecular weight of } \\
45 \mathrm{~kg} . \mathrm{kmol}^{-1}, \text { density of } 2 \mathrm{~kg} \cdot \mathrm{m}^{-3} \text { and a molar flow rate of } 0.1 \mathrm{kmol} . \mathrm{s}^{-1}, \text { has a } \\
\text { flooding velocity of } 0.15 \mathrm{~m} \cdot \mathrm{s}^{-1} . \text { The column is designed to operate at } 60 \% \text { of the } \\
\text { flooding velocity. Which one of the following is the CORRECT value for the } \\
\text { column diameter (in } \mathrm{m}) ?\end{array}$ \\
\hline
- & $\frac{5}{\sqrt{\pi}}$ \\
\hline - & $5 \sqrt{\pi}$ \\
\hline - & $4 \pi$ \\
\hline - & $\frac{10}{\sqrt{\pi}}$ \\
\hline
\end{tabular}