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Chemical Engineering - Process Equipment and Plant Design

Exercise : Process Equipment and Plant Design - Section 3
26.
Pick out the wrong statement pertaining to the design of a horizontal tube evaporator.
It is unsuitable for concentrating those liquids, which form a scale or deposit salt.
It is suitable for process, in which the final product is a liquor instead of solid.
Its usual dimensions are: tube dia = 2-3 cms; evaporator body dia = 1-4 metres and evaporator height = 2.5-4 metres.
Liquor flows inside the tube, while the steam is outside submerging the tube.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
27.
Weep holes provided in the plates of a distillation column
facilitate draining out liquid from a tray when the unit is not in operation.
are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid.
must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation.
all (a), (b) and (c).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
28.
Steam is preferred to be used as a heating medium in heat exchangers, because of its
low cost.
high latent heat.
non-corrosive condensate.
high film co-efficient.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
29.
__________ shapedroof is the most commonly used roof for cylinderical storage tanks.
Conical
Flat
Dome
Umbrella
Answer: Option
Explanation:
No answer description is available. Let's discuss.
30.
Pick out the wrong statement pertaining to 'Horton sphere' used for the storage of liquid ammonia.
Diameter of Horton sphere is normally 6 to 25 metres and it is supported by 6 to 12 nos. tubular or rolled section column.
Thickness of spherical shell is half that of the cylinderical vessel under same operating pressure condition. Besides, the ratio of surface area to volume is less for sphere than any other shape ; hence insulation required is less.
Horton sphere is used for the storage of gases and volatile liquid at a moderate pressure of 1 to 10 kg/cm2 .
Horton sphere is used for the storage of liquid at sub-zero temperature at very high pressure upto 200 kg/cm2 .
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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