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Process Equipment and Plant Design

Process Equipment and Plant Design
Needle valves are generally not used for

High pressure throttling service
Very large diameter pipes
Smaller sizes of pipe
Very accurate flow control

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Process Equipment and Plant Design
Scale up problem in design based on the similarity concept takes into account __________ similarity.

Dynamic
Kinematic
Geometrical
All of these

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Process Equipment and Plant Design
In a double pipe concentric heat exchanger, the equivalent diameter of annulus for heat transfer would be (where, D₁ and D₂ are I.D. of inner and outer pipes)

(D₂² - D₁²)/D₂²
(D₂² - D₁²)/D₁²
None of these
D₂ - D₁

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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
Rotary driers are most economically designed for the number of heat transfer units (HTU) from

10 to 20
0.01 to 1
5 to 10
1.5 to 2.5

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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
12.5
17.5

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