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Process Equipment and Plant Design

Process Equipment and Plant Design
Low pressure steam (with saturation temperature between 105 to 120°C) is usually used in the vacuum evaporators, which normally employ a vacuum of about __________ mm Hg (referred to a 760 mm mercury barometer).

750
450
650
250

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Process Equipment and Plant Design
In a distillation column, the minimum residence time for liquid in the downspout is about __________ seconds.

8
180
1
80

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Process Equipment and Plant Design
The normal range of velocity of steam in pipes is __________ m/sec.

1-5
10-20
0.1-0.5
80-100

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Process Equipment and Plant Design
The ratio of tube length to shell diameter in case of liquid shell and tube heat exchanger ranges from

3 to 5
6 to 12
2 to 3
4 to 8

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

0.5
0.25
0.1
0.8

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Process Equipment and Plant Design
Which of the following factors determine the amount of entrainment in a distillation column?

All of these
Vapour velocity in the volume between the plates
Plate spacing
Depth of liquid above the bubble cap slots

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