ANS:B - Thermal conductivity of a dry material is more than that of the damp material.

The wrong statement is: "Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator." This statement does not accurately reflect the relationship between capacity, economy, and steam consumption in an evaporator. The ratio of capacity to economy does not equal the steam consumption in kg/hr. Capacity refers to the maximum amount of material (e.g., liquid) that can be processed by the evaporator, while economy typically refers to the efficiency of the evaporator in terms of steam usage or energy consumption. The steam consumption in kg/hr is a measure of the actual amount of steam used by the evaporator. Therefore, the correct option is: "Ratio of its capacity to economy equals the steam consumption in kg/hr in an evaporator."