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Process Equipment and Plant Design

Process Equipment and Plant Design
In the downcomer of a distillation column, the minimum recommended residence time is about __________ seconds.

2.5
12.5
5
17.5

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Process Equipment and Plant Design
Speed of the drum of the rotary vacuum filter normally ranges from __________ rpm.

0.1 to 2
3 to 8
5 to 7
8 to 15

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Process Equipment and Plant Design
Friction factor for turbulent flow in a new pipe is given by

f = 16/NRe
f = 25/NRe
f = 0.04/NRe0.16
f = 0.22 NRe0.05

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Process Equipment and Plant Design
A high vapour velocity is required for high plate efficiency in a seive plate coloumn. The satisfactory value of operating vapor velocity for design purpose in seive plate column is about __________ percent of the flooding velocity.

80
95
60
45

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Process Equipment and Plant Design
In actual operation of distillation column, the vapour is not distributed uniformly among the bubble caps, primarily because of the

Lower skirt clearance
Small downcomer liquid seal
Liquid gradient on the tray
Lower static submergence

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Process Equipment and Plant Design
The type of stress developed in a metallic bar on subjecting it to a change in temperature without allowing it to be deformed is __________ stress.

Thermal
Compressive
Shear
Tensile

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