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Process Equipment and Plant Design

Process Equipment and Plant Design
Maximum plate efficiency is achieved in case of __________ flow.

Cross
Reverse
Split
Cascade

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Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Lower static submergence
Liquid gradient on the tray
Lower skirt clearance
Small downcomer liquid seal

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Process Equipment and Plant Design
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

2.2 to 2.6
1.6 to 2
2.7 to 3
1.1 to 1.5

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Process Equipment and Plant Design
A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

(ph - dt)/ph
(ph - dh . dt/2)/ph
(ph - dh)/ph
(ph - dh)/dh

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Process Equipment and Plant Design
Le/D for a Tee (used as elbow, entering branch) would be

Less than that for Tee (used as elbow, entering run)
Around 90
Both B and C
More than that for Tee (used as elbow, entering run)

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Process Equipment and Plant Design
In case of 1.5" heat exchanger tubes, the inside flow area __________ with decrease in BWG.

Decreases
Increases
None of these
Remains same

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