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Environmental Engineering

Environmental Engineering
Corrosion in concrete sewers is caused by

Septic conditions
Chlorine
Dissolved oxygen
Nitrogen

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Environmental Engineering
The hourly variation factor is usually taken as

2.0
1.5
2.7
1.8

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Environmental Engineering
The water carriage system of collection of waste product

Is cheaper in initial cost than dry conservancy system
Creates hygienic problem
Requires treatment before disposal
All of these

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Environmental Engineering
Disinfection of water results in

Complete sterilisation
Removal of hardness
Removal of turbidity
Killing of disease bacteria

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Environmental Engineering
The effective size of sand particles used in slow sand filters is

0.25 to 0.35 mm
0.60 to 1.00 mm
0.35 to 0.60 mm
1.00 to 1.80 mm

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Environmental Engineering
In facultative stabilization pond, the sewage is treated by

Algae only
Dual action of aerobic bacteria and anaerobic bacteria
Aerobic bacteria only
Sedimentation

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MORE MCQ ON Environmental Engineering

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