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

Is economical in operation
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

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Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

Equal to the tube diameter
More than the tube diameter
More in case of triangular pitch as compared to the square pitch tube layout
Not less than one-fourth of the tube diameter or 3/16"

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Process Equipment and Plant Design
In a vertical short tube evaporator (Calendria type), the

All of these
Area of central downtake is equal to 40 to 100% of total cross-sectional area of the surrounding tube
Liquor is inside the tube while the steam is outside the tube
Tube dia of 2.5-7.5 cms, tube length of 75-200 cms and cylinderical drum dia of 1-6 metres are normally used

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to a shell and tube heat exchanger.

The maximum value of baffle spacing is equal to the I.D. of the shell
The maximum unsupported tube span is generally about 75 times tube diameter, but is reduced to about 60 times for aluminium, copper & alloys of these
Disk and doughnut baffle is the most commonly used baffle
The minimum value of baffle spacing is 50 mm

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