Q1: Which is the most suitable for the concentration of foamy & frothy liquors ?

ANS:B - Long tube vertical evaporator

The most suitable option for the concentration of foamy and frothy liquors is the agitated film evaporator. Agitated film evaporators are specifically designed to handle liquids that foam or froth during concentration. These evaporators incorporate agitators or rotating blades that continuously mix the liquid, preventing the formation of stable foam layers. The agitation helps to break up any foam or froth that forms, ensuring smooth operation and efficient heat transfer. In contrast, long tube vertical evaporators and open pan evaporators may not be as effective for handling foamy or frothy liquors. Long tube vertical evaporators rely on gravity for liquid flow, which may not effectively address foaming issues. Open pan evaporators operate at atmospheric pressure and may struggle to handle foaming or frothing liquids efficiently. Therefore, the most suitable option for concentrating foamy and frothy liquors is the agitated film evaporator.