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Process Equipment and Plant Design

Process Equipment and Plant Design
In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.

180
80
8
1

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Process Equipment and Plant Design
Ratio of tube length to shell diameter for a shell and tube heat exchanger is

Both B & C
4 : 1 to 8 : 1 for liquid-liquid exchanger
8 : 1 to 12 : 1 for both liquid-liquid and gas-gas heat exchangers
< 4 : 1 for gas-gas exchangers

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Process Equipment and Plant Design
Which tube arrangement in a heat exchanger would facilitate highest heat transfer rate?

Diagonal square pitch
Heat transfer rate is independent of tube arrangement
Triangular pitch
Square pitch

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Process Equipment and Plant Design
An increase in the liquid resistance to interphase mass transfer and a resultant reduction in plate efficiency is caused by

An increase in liquid viscosity
Decrease in gas solubility for absorbers
All of these
An increase in relatived volatility for rectification columns

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Process Equipment and Plant Design
Equivalent diameter for heat transfer calculation for a duct of square cross-section having each side as 'd' will be

√(2d)
√(2πd)
√d
D

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

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