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Process Equipment and Plant Design

Process Equipment and Plant Design
The safe distance of habitation from a hazardous chemical plant (TLV of its product < 1000 ppm) should be about __________ kms.

15
1
5
25

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Process Equipment and Plant Design
The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.

24
34
18
6

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Process Equipment and Plant Design
Maximum acceptable total liquid gradient over a tray is about __________ mm.

45.5
5.5
30.5
12.5

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Process Equipment and Plant Design
An adequate clearance between the tray and the shell wall of a distillation column is provided to

Drain the liquid from the tray when the unit is not in operation
Allow for thermal expansion and facilitate installation
None of these
Avoid back-trapping

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Process Equipment and Plant Design
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 (7/8").

Three fourth
Half
1.5 times
Equal to

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Process Equipment and Plant Design
For a cylinderical internally pressurised vessel, which of the following closure types would withstand highest pressure, if each closure is of the same material and thickness?

Ellipsoidal (2 : 1)
Flat plate
Hemispherical
Conical

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