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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

0.25
0.5
0.1
0.8

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

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

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Process Equipment and Plant Design
Lap joints are preferred for plates having thickness __________ mm.

43961
> 5
> 3
< 12.5

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Process Equipment and Plant Design
In packed towers provided with saddle packing, liquid redistributors are positioned at every __________ times column diameter or 6 metres whichever is less.

43959
20-25
44119
43864

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Process Equipment and Plant Design
Liquid gradient over the tray results due to the

Low gas velocity
Large reflux ratio
Large plate spacing
Resistance offered to flow of liquids by caps & risers and the flow of gas

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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.

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

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