Environmental Engineering in CE
Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is

Inversely proportional to viscosity of gas
Proportional to the pressure of the gas
Proportional to the viscosity & density of the gas
Both B and C

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Environmental Engineering in CE
Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

Neutralised by alkali treatment
None of these
Diluted with fresh water to reduce its acidity
Left as such without any treatment

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