Process Equipment and Plant Design
A pipe is generally made of circular cross-section, because a circular cross-section has the

Lowest surface area requirement for a given volume
Higher structural strength
None of these
Both A & B

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Process Equipment and Plant Design
In a shell and tube heat exchanger for a given heat transfer surface area, smaller diameter tubes are favoured as compared to larger diameter ones ; because the smaller diameter tubes

Are easier to clean
Can be fitted into a smaller shell diameter hence the cost of the heat exchanger would be less
Are less prone to fouling
None of these

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