Process Equipment and Plant Design
A forced circulation long tube vertical evaporator as compared to the natural circulation evaporator

Employs high velocity, high heat transfer rate and less heating surface requirement
Both B & C
Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle
Is economical in operation

ANSWER DOWNLOAD EXAMIANS APP

Process Equipment and Plant Design
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
None of these
Are easier to clean
Are less prone to fouling

ANSWER DOWNLOAD EXAMIANS APP

Process Equipment and Plant Design
When one of the fluids is highly corrosive and has fouling tendency, it should

Preferably flow inside the tube for its easier internal cleaning
Perferably flow outside the tube
Flow outside the tube, when the flow is counter-current and inside the tube when the flow is co-current
Flow at a very slow velocity

ANSWER DOWNLOAD EXAMIANS APP