Chemical Engineering · all questions

Process Equipment And Plant Design
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Q361

The optimum size ratio for two mixed reactors in series depends on the kinetics of the reaction and the conversion level. For reaction orders more than one, the

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Q362

1.2 to 3.8 cms is the value of the

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Q363

Wall thickness of schedule 40 pipe as compared to that of schedule 80 pipe is

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Q364

Larger depth of liquid on the trays of a distillation column

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Q365

In a shell and tube heat exchanger, the 'tube pitch' is defined as the

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Q366

For pipe flows, head is proportional to __________ at constant capacity (where D = pipe diameter).

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Q367

Normally, the length to diameter ratio of rotary dryers varies form 4 to 10 and for its economic operation, the number of transfer units (NTU) for such dryers varies from

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Q368

Factor of safety (i.e., overdesign factor) in heat transfer equipments is about __________ percent more than the actual/theoretical design factor.

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Q369

Minimum baffle spacing recommended in a shell and tube heat exchanger is equal to

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Q370

The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

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Q371

Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm

(\frac{7}{8}^{^{''}}) .

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Q372

Two iron pipes of the same nominal diameter but different schedule numbers will have the same

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Q373

\frac{L _{e}}{D}

for fully open gate valves would be

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Q374

Pick out the wrong statement about the design of seive plate column and the bubble cap column.

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Q375

__________ tray arrangement is recommended for distillation column having diameter upto 4 ft.

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Q376

Hole diameter of the seive trays in the distillation column ranges from __________ mm.

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Q377

With increase in the reflux ratio for a fixed production from a continuous binary distillation column, the __________ decreases.

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Q378

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

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Q379

Liquid gradient over a tray can be minimised by

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Q380

Needle valves are generally not used for

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