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Environmental Engineering

Environmental Engineering
As compared to cast iron pipes, steel pipes are

Heavier
Stronger
Costlier
Less susceptible to corrosion

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Environmental Engineering
The depression of water table in a well due to pumping will be maximum(Where ‘R’ is the radius of influence)

Close to the well
None of these
At a distance R/2 from the well
At a distance R from the well

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Environmental Engineering
As compared to higher pH values, the contact period required for efficient chlorination at lower pH values is

Same
None of these
Smaller
Larger

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Environmental Engineering
The overflow rate for plain sedimentation tanks is about

1000 to 1250 liters/hour/ m²
500 to 750 liters/hour/ m²
1250 to 1500 liters/hour/m²
1500 to 2000 liters/hour/m²

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Environmental Engineering
The hydraulic mean depth (HMD) for an egg-shaped sewer flowing two-third full is

None of these
Greater than HMD when flowing full
Equal to HMD when flowing full
Less than HMD when flowing full

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Environmental Engineering
In water treatment, rapid gravity filters are adopted to remove

Dissolved organic substances
Bacteria and colloidal solids
Dissolved solids and dissolved gases
Floating solids and dissolved inorganic solids

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