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Environmental Engineering

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

Heavier
Less susceptible to corrosion
Stronger
Costlier

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Environmental Engineering
The specific gravity of sewage is

Slightly greater than 1
Much greater than 1
Slightly less than 1
Equal to 1

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Environmental Engineering
Standard BOD is measured at

20°C - 1 day
25°C - 3 day
30°C - 5 day
20°C - 5 day

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

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

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Environmental Engineering
The velocity of flow does not depend on

Roughness of sewer
Grade of sewer
Hydraulic mean depth of sewer
Length of sewer

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