Chemical Engineering MCQs

Page No. 484

Pressure drop per tray in the atmospheric distillation column is about ________________ psi?


a0.01 – 0.5

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b0.07 – 0.12

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c0.5 – 1.0

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d1 – 3

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View Answer 0.07 – 0.12

In a thin cylindrical shell, the hoop stress is ________________ stress?


aRadial

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bCircumferential tensile

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cCompressive

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dLongitudinal

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The maximum liquid gradient over a tray must not exceed__________________?


a0.5″ -1.25″

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b2″-3.5″

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c5″

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dHalf the tray spacing

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View Answer 0.5″ -1.25″

In the downcomer of a distillation column, the minimum recommended residence time is about _______________ seconds?


a2.5

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b5

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c12.5

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d17.5

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View Answer 5

Flanges are connected to pipes by _______________________?


aScrewing

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bWelding

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cBrazing

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dAll A., B. and C.

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View Answer All A., B. and C.

Pick out the wrong statement pertaining to the comparative evaluation of performance of the packed tower and the plate tower ?


aPlate tower is preferred, if interstage cooling is required to remove heats of reaction or solution

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bPlate tower is preferred over packed tower, if the operation involves liquids containing dispersed solids

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cThe total weight of a dry plate tower is usually much more than that of a dry packed tower designed for the same duty

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dIn operations involving large temperature changes. (e.g. distillation), plate towers are preferred over packed towers as the packing may be crushed due to large temperature changes

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Cylindrical pressure vessels in horizontal condition is generally supported on a ________________ support?


aLug

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bSkirt

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cSaddle

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dGuy wire

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View Answer Saddle

In case of design of a shell and tube heat exchanger___________________?


aMinimum cleaning lane of 6.5 mm is provided, when tubes are on a square pitch

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bMinimum tube sheet thickness (in which tubes are fixed) is equal to the O.D. of the tube upto 15 mm tube diameter; and for > 15 mm tube diameter, tube sheet thickness is smaller than tube diameter

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cO.D. of the tube is 6 to 40 mm while the tube lengths used are 0.5, 2.5, 3.0, 4.0, 5.0, 6 metres

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dAll A., B. & C.

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View Answer All A., B. & C.

With increase in gas flow rate to fabric surface area ratio (Nm3/hr/m2 fabric surface area), the size & the cost of a bag filter___________________?


aIncreases

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bDecreases

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cRemain unaffected

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dNone of these

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View Answer Decreases

The equivalent diameter for pressure drop is _______________ that for heat transfer?


aSmaller than

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bGreater than

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cEqual to

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dNot related with

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View Answer Not related with

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