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Process Equipment and Plant Design

Process Equipment and Plant Design
Reflux ratio variation in a distillation column is between

Zero and one
None of these
Minimum and infinity
Zero and infinity

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Process Equipment and Plant Design
Cylindrical storage tanks used for the storage of volatile liquids (e.g., naphtha) have __________ roofs.

Floating
Fixed
Conical
Flat

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Process Equipment and Plant Design
The longitudinal stress induced in a thin walled cylinderical vessel under internal pressure is

pd/4t
pd/8t
pd/2t
pd/t

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Process Equipment and Plant Design
The minimum tray spacing in distillation column of diameter less than 3 ft is normally __________ inches.

18
34
24
6

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Process Equipment and Plant Design
In a continuous distillation column, the optimum reflux ratio ranges from __________ times the minimum reflux ratio.

1.6 to 2
2.2 to 2.6
2.7 to 3
1.1 to 1.5

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Process Equipment and Plant Design
The wall thickness of thin cylindrical shell with hemispherical ends is __________ that of the spherical ends.

More than
Less than
Either B or C; depends on maximum permissible internal pressure
Equal to

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