Chemical Engineering :: Process Equipment and Plant Design
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Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.
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Larger depth of liquid on the trays of a distillation column
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Pick out the wrong statement.
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Pick out the wrong statement.
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In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.
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For identical situation, condensing film coefficient in case of a horizontal condenser is almost __________ the value expected in case of vertical condenser.
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Diameter of rivet hole (d, mm) and the plate thickness (t, mm) are related by Unwin's formula as
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A binary liquid azeotropic mixture has boiling point lower than either of the components, when it shows __________ deviation from Raoult's Law.
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In which of the following evaporators, steam is fed inside the tube while the liquor is outside the tube ?
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A single pass air heater is connected to a two pass unit. For the air flow rate and other conditions remaining the same, the film heat transfer co-efficient for air will vary in the ratio of
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A.
Plate efficiency increases with increase in superficial vapour velocity till entrainment limit.
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B.
Increase in depth of the liquid about the slots increases the plate efficiency, particularly if the liquid depth is < 1".
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C.
Too small a plate spacing can cause a low efficiency, if the vapour velocity is greater than the allowable value.
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D.
none of these.
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A.
In practical operation, distillation towers having diameter 3-6 metres equipped with bubble cap (round) size of 15 cms are used.
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B.
Height of packing in a packed tower is about 3 times the column diameter for raschig rings and about 5 to 10 times the column diameter for saddle packing.
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C.
In a seive tray, the minimum hole diameter is equal to the tray thickness.
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D.
In a stainless steel seive tray, the minimum hole diameter is equal to 10 times the plate thickness.
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