Q1: Economy of a multiple effect evaporator is not influenced much by the

ANS:A - boiling point elevations

The economy of a multiple effect evaporator is not influenced much by the boiling point elevations. The economy of a multiple effect evaporator refers to the efficiency of steam utilization in the evaporation process. It is determined by the ratio of the amount of vapor produced to the amount of steam consumed. While factors such as the temperature of the feed, rate of heat transfer, and ratio of the weight of thin liquor to thick liquor can affect the efficiency and operation of the evaporator, they do not significantly influence the economy. However, boiling point elevations, which occur due to the presence of non-volatile solutes in the liquid being evaporated, can affect the temperature at which boiling occurs and the amount of heat required for evaporation. But the impact of boiling point elevations on the economy of a multiple effect evaporator is relatively minor compared to other factors. Therefore, the correct statement is: "boiling point elevations."