Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Increases pressure drop, increases surface area
Increases pressure drop, decreases surface area
Decreases pressure drop, increases surface area
Decreases pressure drop, decreases surface area

ANSWER DOWNLOAD EXAMIANS APP

Mass Transfer
The wetted wall tower is used to determine

Individual mass transfer co-efficient (M.T.C.) in gaseous system
The overall M.T.C. of the system
M.T.C. of liquid in liquid-gas system
M.T.C. of individual components in a liquid-liquid system

ANSWER DOWNLOAD EXAMIANS APP