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Process Equipment and Plant Design

Process Equipment and Plant Design
Value of Peclet number = ∞, is the representative of

Complete back mixing
Eddy diffusivity = 0
Plug flow
Laminar flow

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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.

Remains same
Increases
None of these
Decreases

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

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Process Equipment and Plant Design
In a cylinderical vessel subjected to internal pressure, the longitudinal stress σL and the circumferential stress, σh are related by

σh = σL/2
σh = 2 σL
σh = σL
No relation exists

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Process Equipment and Plant Design
Le/D for 90° elbow (medium radius) and 90°square elbow would be respectively around

250 and 600
3 and 5
100 and 250
25 and 60

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Process Equipment and Plant Design
At the following point for a given packing and set of fluids, the pressure drop per metre of packed height, with variation in fluid rates and operating pressure

Remains same
Increases
May increase or decrease depending upon the solubility of the gas in the liquid
Decreases

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