Process Equipment and Plant Design
In a shell and tube heat exchanger, the clearance of the tube is generally

More in case of triangular pitch as compared to the square pitch tube layout
Equal to the tube diameter
More than the tube diameter
Not less than one-fourth of the tube diameter or 3/16"

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Process Equipment and Plant Design
In a bag filter, the pressure drop increases directly as the

None of these
Density of the gas and inversely as viscosity of the gas
Viscosity of the gas and inversely as density of the gas
Density of the gas, but is independent of the viscosity of the gas

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