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Process Equipment and Plant Design

Process Equipment and Plant Design
Excessive liquid gradient on a tray may result in the

Back trapping
Gas blowing beneath cap skit
Maldistribution of gas
All of these

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Process Equipment and Plant Design
In seive plate column, holes are drilled or punched in sizes ranging from 2.5 to 12 mm (5 mm being widely used). The hole pitch is normally __________ times the hole diameter to give the required hole area.

5 to 10
0.5 to 1.5
2.5 to 4.0
10 to 15

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Process Equipment and Plant Design
In a shell and tube heat exchanger having triangular pitch, the shell side equivalent diameter is given by

(4p² - πd²/4)/πd
4(0.86p² - πd²)/πd
(p² - πd²/4)/πd
4(0.86p² - πd²/4)/πd

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Process Equipment and Plant Design
In a pressure vessel containing multiple openings of various dimensions at different parts, stress concentration at the edges of the opening is maximum which becomes negligibly small beyond the area covered by __________ times the hole diameter.

Five
Ten
Twenty
Two

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Process Equipment and Plant Design
For identical operating conditions, the pressure drop over __________ tray is the highest out of the following.

Sieve
Counterflow
Valve
Bubble cap

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Process Equipment and Plant Design
In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.

2.5
5
17.5
12.5

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