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Environmental Engineering

Environmental Engineering
The dissolved oxygen level in natural unpolluted waters at normal temperature is found to be of the order of

1 mg/liter
100 mg/liter
1000 mg/liter
10 mg/liter

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Environmental Engineering
The rate of filtration in slow sand filters in million litres per day per hectare is about

500 to 600
100 to 150
50 to 60
1400 to 1500

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Environmental Engineering
Which of the following methods of analysis of water distribution system is most suitable for long and narrow pipe system?

Electrical analysis method
Hardy cross method
Circle method
Equivalent pipe method

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Environmental Engineering
The chemical most commonly used to increase speed of sedimentation of sewage is

Sulphuric acid
Sodium permanganate
Copper sulphate
Lime

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Environmental Engineering
The type of valve, which is provided on the suction pipe in a tube-well, is

Air relief valve
Pressure relief valve
Reflux valve
Sluice valve

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Environmental Engineering
The process of lagooning is primarily a means of

Increasing flow of sewage through imhoff tanks
Reducing the excessive flow in sewers
Disposing of sludge
Increasing the capacity of storage reservoirs

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