Process Equipment and Plant Design MCQs

161. Pick out the wrong statement pertaining to a shell and tube heat exchanger.

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The minimum value of baffle spacing is 50 mm.
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 correct answer is option D.

164. High pressure fluid in a shell and tube heat exchanger should preferably be routed through the

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tubes to avoid the expansion of high pressure shell construction.
shell side for smaller total pressure drop.
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.
✅ The correct answer is option A.

168. Height equivalent to a theoretical plate (HETP) is the height of packing that will give the same separation as one theoretical plate in gas-liquid mass transfer operations like distillation, absorption/stripping and humidification/dehumidification. HETP which is experimentally determined, depends upon the

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flow rates of each fluid.
type and size of packing.
concentration of each fluid.
all a, b & c.
✅ The correct answer is option D.

170. The wall thickness for a large high pressure pipeline is determined by the consideration of the

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axial tensile stress in the pipe.
forces exerted by static and dynamic action at bends.
circumferential pipewall tension.
temperature stresses.
✅ The correct answer is option C.