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Process Equipment and Plant Design

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

30.5
12.5
5.5
45.5

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Process Equipment and Plant Design
The slope of operating line in the rectifying section of a distillation column is unity, if the reflux ratio is

1
0
∞
Minimum

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Process Equipment and Plant Design
The buckling tendency of compression members is always in the direction of the

Perpendicular to the axis of the load
Axis of the load
Least radius of gyration
None of these

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Process Equipment and Plant Design
A shell may by termed as thin if its thickness to diameter ratio is less than 0.1. The factor which can be neglected in the calculation of membrane stresses is

Shear
Deformation
Elongation
Bending

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Process Equipment and Plant Design
The minimum shell thickness for tank ≤ 15 metres diameter is limited to __________ mm, for reasons of elastic stability.

5
2
10
15

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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

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

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