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
Is economical in operation
Employs a centrifugal pump placed between external downtake from vapor drum and inlet to tube bundle

ANSWER DOWNLOAD EXAMIANS APP

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

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
Preferably flow inside the tube for its easier internal cleaning
Flow at a very slow velocity

ANSWER DOWNLOAD EXAMIANS APP