Process Equipment and Plant Design
In the case of a shell and tube heat exchanger, the logarithmic mean temperature difference

Is always less than arithmetic mean value, but more than geometric mean value
Is always more than arithmetic mean value and the geometric mean value
Is always less than arithmetic average value
May be either more or less than geometric mean and arithmetic mean value depending upon whether the flow of stream is co-current or counter-current

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

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Process Equipment and Plant Design
Pick out the wrong statement about the design of seive plate column and the bubble cap column.

Weir height for a bubble cap plate column is the same as that for a seive plate column
Weir length for a bubble cap plate is the same as that for the seive plate
Weir height in case of a bubble cap plate ranges from 50 to 150 mm and is higher than the seive plate
The downcomer design and the residence time in the downcomer is almost same for seive plate and bubble cap columns

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