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Environmental Engineering

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

Lime
Sulphuric acid
Sodium permanganate
Copper sulphate

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Environmental Engineering
Standard EDTA (ethylene diamine tetra acetic acid) solution is used to determine the

Turbidity in water
Residual chlorine in water
Dissolved oxygen in water
Hardness in water

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Environmental Engineering
The velocity of flow of water in a sedimentation tank is about

5 to 10 cm/sec
15 to 30 cm/minute
15 to 30 cm/hour
15 to 30 cm/sec

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Environmental Engineering
Septic tank is a (i) Settling tank (ii) Digestion tank (iii) Aeration tank

Only (iii)
(i) and (ii)
Only (i)
(i) and (iii)

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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
Larger
Smaller
None of these

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

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

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