Q1: Pick out the correct statement.

ANS:D - all (a), (b) and (c).

a) "For identical gas flow rates, less pressure drop occurs through a plate tower than through a packed tower." This statement is generally true. Plate towers, also known as tray towers, typically have lower pressure drops compared to packed towers for the same gas flow rates. This is because in a plate tower, the gas flows through well-defined passages (trays) with open areas for passage, while in a packed tower, the gas must flow through a densely packed bed of packing material, which creates more resistance and higher pressure drop. b) "Plate column can handle greater liquid loads without flooding than packed column, but the liquid holdup is more in the case of the plate column." This statement is partially true. Plate columns generally have higher liquid handling capacity before flooding occurs compared to packed columns. The structured nature of the trays in a plate column allows for better liquid distribution and higher liquid holdup capacity. However, it's not accurate to say that the liquid holdup is more in plate columns compared to packed columns. Liquid holdup depends on various factors such as the design of the trays or packing, operating conditions, and the specific application. c) "For the same duty, plate columns weigh less than packed columns." This statement is generally true. Plate columns typically weigh less than packed columns for the same duty. This is because plate columns require fewer materials for construction compared to packed columns, which consist of a packed bed of material that adds significant weight. Plate columns are often preferred in applications where weight is a critical factor, such as in mobile units or offshore installations. In summary, while all statements contain elements of truth, it's important to note that there can be variations depending on specific designs, operating conditions, and applications.