Process Equipment and Plant Design
Tubes are fixed to the tube sheet (a thick circular metallic plate) by the method of tube rolling and brazing (non-removable) or ferrule connection (removable). Thickness of the tube, sheet is normally __________ the outside diameter of the tube but in no case it should be less than 22 mm (7/8").

Three fourth
Half
1.5 times
Equal to

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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

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

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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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