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Process Equipment and Plant Design

Process Equipment and Plant Design
Maximum size of the raschig rings used in a packed tower is about __________ of the coloumn diameter.

1/30th
1/10th
1/50th
1/20th

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Process Equipment and Plant Design
Vertical storage vessels are never supported by __________ support.

Skirt
Lug
Bracket
Saddle

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Process Equipment and Plant Design
Maximum allowable vapour velocity in a bubble cap tower is determined by the

Vapour density
None of these
Diameter of the column
Entrainment considerations

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Process Equipment and Plant Design
Elastic failure of a material occurs, when the tensile stress equals yield strength, yield point or the elastic limit. Also, the elastic failure occurs according to maximum strain theory, when the maximum tensile strain equals (where, σ = yield strength and E = modulus of elasticity)

Σ
E/σ
Σ/E
E

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Process Equipment and Plant Design
In actual operation of a bubble cap distillation tower, the __________ at the bottom of the tower is more than that at the top of the tower.

All of these
Pressure and temperature
Molal flow rate of vapour
Vapour molecular weight

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Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Low gas velocity
Low reflux ratio
Excessive liquid gradient over the tray
High gas velocity

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