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Process Equipment and Plant Design

Process Equipment and Plant Design
Baffle spacing is generally __________ the I.D. of the shell.

More than
Both B and C
Not greater than
Not less than one fifth of

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Process Equipment and Plant Design
In packed towers provided with pall rings liquid redistributors are positioned at heights of every 6 metres or 5-10 times the column diameter, whichever is less. Maximum size of the pall rings should not exceed __________ of the column diameter.

1/2 to 1/4th
1/20-1/30th
1/10-1/15th
1/5-1/10th

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Process Equipment and Plant Design
The main purpose of providing stepping on the trays is to

Improve the flow condition
Increase the residence time
Decrease the pressure drop
Facilitate handling of large flow rate of liquid

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Process Equipment and Plant Design
Circumferential (hoop) stress in a thin cylindrical vessel under internal pressure is __________ the longitudinal stress.

Eight times
Twice
Equal to
Half

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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.

5
20
35
55

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Process Equipment and Plant Design
Brass valves are usually made for pipe sizes __________ inches.

?2
>3.5
>2.5
?1

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