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Process Equipment and Plant Design

Process Equipment and Plant Design
In the design of a paddle agitator, the ratio (paddle dia/tank dia) is normally taken as

0.8
0.1
0.25
0.5

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Process Equipment and Plant Design
Maximum acceptable total liquid gradient over a tray is about __________ mm.

30.5
5.5
45.5
12.5

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Process Equipment and Plant Design
The practical representative values of HETP for a number of commercial operations lies within a range of __________ metre.

0.2-0.5
0.1-0.2
1.2-1.5
0.4-0.9

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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.

0.5 to 1.5
10 to 15
2.5 to 4.0
5 to 10

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Process Equipment and Plant Design
Le/D for fully open gate valves would be

Both B and C
Around 7
Much more than that for fully open globe valves
Much less (say 2% than that for fully open globe valves)

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Process Equipment and Plant Design
Value of Peclet number = 0, is the representative of

Eddy diffusivity = 0
Complete back mixing
Laminar flow
Plug flow

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