Process Equipment and Plant Design
Weep holes provided in the plates of a distillation column

Facilitate draining out liquid from a tray when the unit is not in operation
Must be large enough (usually 1/4" to 5/8" dia) to prevent plugging but should not deliver excessive amount of fluid during operation
All of these
Are normally located near the overflow weir so that any delivery of liquid during operation follows approximately the same path as the overflow fluid

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Process Equipment and Plant Design
Triangular pitch tube layout as compared to square pitch in a shell and tube heat exchanger

Permits the use of less tubes in a given shell diameter
Permits the use of more tubes in a given shell diameter
Facilitates comparatively easier external cleaning because of large clearance
Both B and C

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Process Equipment and Plant Design
Pick out the wrong statement pertaining to the design of a basket type evaporator.

It is used for high viscosity liquor having large rate of scaling
Downtake is formed by the annular space between the bundle and the shell
There is no central downtake
The tube bundle is suspended on bracket

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