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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
0.8
0.1
0.5

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Process Equipment and Plant Design
Which of the following is used to set the diameter of the distillation column?

Number of theorectical plates
Length of straight rectangular weir on cross-flow tray
Allowable vapour velocity
Static submergence

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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.

Flat plate
Ellipsoidal
Torispherical
Hemispherical

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Process Equipment and Plant Design
Corrosion allowance in the design of pressure vessel/chemical equipment is not necessary, if

Both B & C
Wall thickness is > 30 mm
Material of construction is high alloy steel
Plain carbon steel and cast iron parts are used

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Process Equipment and Plant Design
In condenser, the cooling water is passed in the tube side in a pass arrangement, because

It makes condenser compact
It reduces heat transfer area
Pressure drop is reduced
More thinner tubes can be used

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Process Equipment and Plant Design
Back-trapping in a distillation column results due to

Excessive liquid gradient over the tray
Low reflux ratio
High gas velocity
Low gas velocity

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