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Process Equipment and Plant Design

Process Equipment and Plant Design
A minimum clearance of about __________ mm is maintained between the distillation column wall and the bubble cap.

76
19
95
38

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Process Equipment and Plant Design
A perforated plate has holes of diameter dh arranged in a pitch ph. Each hole has a tube of I.D. dt passing through it. The ligament efficiency is given by

(ph - dh)/dh
(ph - dh)/ph
(ph - dh . dt/2)/ph
(ph - dt)/ph

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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
5
55
20

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Process Equipment and Plant Design
Theoretically calculated diameter of the stripping section of the continuous rectification column is __________ that of the enriching section.

Same as
More than
Less than
Either more or less (depending upon relative volatility)

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Process Equipment and Plant Design
Spherical shaped pressure vessel is considered to be the most ideal, because it can

Be designed without wind load considerations
Be fabricated very easily
Be supported very easily
Withstand higher pressure for a given metallic shell thickness

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Process Equipment and Plant Design
Which of the following is the best tube material from thermal conductivity point of view alone?

Carbon steel
Copper
Stainless steel
Aluminium

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