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Process Equipment and Plant Design

Process Equipment and Plant Design
Lessing ring is formed by the addition of a partition across the centre of a raschig ring, which results in an area increase of about __________ percent.

35
20
55
5

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Process Equipment and Plant Design
Multiple blade paddle agitator is used for mixing high viscosity liquids/paste in which the paddle diameter is commonly 0.8 times the tank diameter. However, the width of the blade is in the range of __________ times the paddle diameter.

0.65 to 0.80
0.3 to 0.5
0.5 to 0.6
0.1 to 0.25

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Process Equipment and Plant Design
In a thin cylindrical shell, the hoop stress is __________ stress.

Compressive
Longitudinal
Radial
Circumferential tensile

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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.

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

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Process Equipment and Plant Design
The difficulty of liquid distribution in packed towers is accentuated, when the ratio of tower diameter to packing diameter is

> 20 < 50
< 7
< 30
> 7 < 15

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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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