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

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

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

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