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Environmental Engineering in CE

Environmental Engineering in CE
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Hydrogen flouride
Hydrocarbons
Hydrogen sulphides
Nitrogen dioxide

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Environmental Engineering in CE
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.

Color (Hazen)
All of these
Turbidity
Total solids

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Environmental Engineering in CE
Suspended solid present in the waste water generated in blast furnace gas cooling and cleaning plant is removed by

Radial settling tank (thickener) using coagulant (lime & ferrous sulphate)
Biological oxygen pond
Filtration
Lagoons

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Environmental Engineering in CE
Inhalation of lead compounds present in automobile exhaust (using leaded petrol) causes

Blood poisoning
Nervous system disorder
Anaemia
All of these

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Environmental Engineering in CE
COD of raw municipal sewage may be in the range of about __________ mg/litre.

1500-2500
1-2
5-10
90-120

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Environmental Engineering in CE
Which of the following is not a natural source of air pollution?

Biological decay of vegetable matter
Photochemical oxidation of organic matter
Volcanic eruptions and lightening discharges
None of these

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