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Process Equipment and Plant Design

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

Laminar flow
Eddy diffusivity = 0
Plug flow
Complete back mixing

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Process Equipment and Plant Design
In a heat exchanger, shell side fluid velocity can be changed by changing the tube

Layout
Both A & B
Neither A nor B
Pitch

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Process Equipment and Plant Design
The ends of a cylinderical vessel can be closed by a head, which can be one of the four shapes. For the same thickness, choose the one which can withstand the highest pressure.

Hemispherical
Torispherical
Ellipsoidal
Flat plate

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

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

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Process Equipment and Plant Design
Pressure drop due to pipe fittings can be estimated by the equation, ΔP/p = 4f.Le/D.V2/2gc, where, Le = equivalent length of straight pipeline which will incur the same frictional loss as the fitting and D = diameter of the fitting. The value of Le/D (dimensionless) for 45° elbow and 180° close return bends would be respectively around

300 and 500
45 and 75
5 and 10
180 and 300

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Process Equipment and Plant Design
Which of the following is the most common type of baffle used in industrial shell and tube heat exchanger?

Orifice baffle
Disk and doughnut baffle
25% cut segmental baffle
75% cut segmental baffle

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