Process Equipment and Plant Design
Liquid gradient over the tray results due to the

Resistance offered to flow of liquids by caps & risers and the flow of gas
Large plate spacing
Large reflux ratio
Low gas velocity

ANSWER DOWNLOAD EXAMIANS APP

Process Equipment and Plant Design
High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

Shell side, if the flow is counter-current and tube side if the flow is co-current
Shell side for large overall heat transfer co-efficient
Shell side for smaller total pressure drop
Tubes to avoid the expansion of high pressure shell construction

ANSWER DOWNLOAD EXAMIANS APP