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Process Equipment and Plant Design

Process Equipment and Plant Design
A pressure vessel is said to be made of 'thick' shell, if the ratio of its diameter to wall thickness is

20
10
10
20

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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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Process Equipment and Plant Design
The main purpose of providing stepping on the trays is to

Facilitate handling of large flow rate of liquid
Improve the flow condition
Decrease the pressure drop
Increase the residence time

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Process Equipment and Plant Design
The necessary wall thickness for a metallic storage vessel is a function of the

All of these
Operating pressure and welding/joint efficiency
Diameter of the vessel
Ultimate tensile strength (or yield point) of the material and operating temperature

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Process Equipment and Plant Design
Which of the following is not a graphical method (but is an analytical method) for the calculation of theoretical number of stages in case of continuous binary distillation?

Ponchon-Savarit method
McCabe-Thiele's method
None of these
Sorel-Lewis method

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Process Equipment and Plant Design
Where does the maximum tensile strength occur in a thick cylindrical vessel subjected to internal pressure?

At the mid thickness of the cylindrical wall
At the outer surface
At the inner surface
None of these

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