Process Equipment and Plant Design
With increase in pressure drop (for a given particle size), the dust collection efficiency of a cyclone separator will

Increase or decrease depending on the nature of the dust
Increase
Decrease
Remain unaffected

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

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