1. A. Explain why vacuum evaporators have higher steam efficiency than atmospheric evaporators. B. Explain why as the wet bulb temperature decreases the cooling efficiency of a cooling tower increases. C. In cooling towers what is approach. D. In a packed bed column, explain why the pressure drop increases as the liquid flow rate increases at constant gas flow rate. E. What are the properties of a good absorbent to be used in gas absorption F. In a distillation column, what is the effect of increasing reflux flow rate on the sharpness of separation and on the pressure drop. G. What is weeping point and when it happens