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Environmental Engineering in CE

Environmental Engineering in CE
The most commonly used chemical coagulant in water treatment is

Alum
Ferrous sulphate
Lime
Hydrazine

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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)
Filtration
Lagoons
Biological oxygen pond

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Environmental Engineering in CE
Removal of __________ is accomplished by aeration of water.

Dissolved solids
Suspended solids
None of these
Dissolved gases

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Environmental Engineering in CE
Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by

Filtration and recycling for cooling coke oven gas
Discharging in the river stream
Quenching of hot coke
None of these

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Environmental Engineering in CE
Noise level inside a jet air liner in normal flight is about __________ decibels.

80
145
125
100

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Environmental Engineering in CE
Presence of __________ bacteria in water causes disease like typhoid.

Pathogenic
Aerobic
Anaerobic
Non-pathogenic

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