Q1: In a packed bed absorption column, the channelling will be noted by the

ANS:B - sharp drop in pressure drop.

In a packed bed absorption column, channelling refers to uneven distribution of the gas or liquid flowing through the packed bed. This can occur due to irregularities or blockages in the packing material. Channelling typically leads to a decrease in the efficiency of the column, as it allows the flowing fluid to take preferential paths through the bed, bypassing some of the available surface area for absorption. In terms of the given options:

• An increase in flow rate is not typically associated with channelling. Instead, it may indicate other issues such as flooding or improper operation.
• A sharp drop in pressure drop is also unlikely to be associated with channelling, as channelling tends to disrupt the uniform flow of the fluid through the bed, potentially leading to fluctuations or increases in pressure drop.
• A sharp rise in pressure drop is a common indication of channelling. When the fluid encounters preferential flow paths due to channelling, it can lead to localized increases in pressure drop as the fluid encounters resistance in these paths.