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Environmental Engineering

Environmental Engineering
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)

R > (N + y)
y = N + R
R = N + y
N = y + R

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Environmental Engineering
Alkalinity in water is expressed as milligrams per litre in terms of equivalent

Sodium carbonate
Calcium carbonate
Calcium hydroxide
Magnesium carbonate

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Environmental Engineering
The rate of BOD exerted at any time is

Inversely proportional to BOD satisfied
Directly proportional to BOD satisfied
Inversely proportional to BOD remaining
Directly proportional to BOD remaining

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Environmental Engineering
The hourly variation factor is usually taken as

1.5
2.7
1.8
2.0

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Environmental Engineering
The settling velocity of a particle in a sedimentation tank depends on

Both depth and surface area of tank
Depth of tank
Surface area of tank
None of these

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Environmental Engineering
The velocity of flow does not depend on

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

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