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Environmental Engineering

Environmental Engineering
The velocity of flow does not depend on

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

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Environmental Engineering
Chlorine demand of water is equal to

Applied chlorine
Residual chlorine
Difference of applied and residual chlorine
Sum of applied and residual chlorine

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Environmental Engineering
The slope of sewer shall be

Given in the direction opposite to natural slope of ground
Zero
Given in the direction of natural slope of ground
Steeper than 1 in 20

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Environmental Engineering
Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filters The correct answer is

(i) and (ii)
(ii) and (iv)
(i) and (iv)
(ii) and (iii)

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Environmental Engineering
The hourly variation factor is usually taken as

1.5
2.0
2.7
1.8

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Environmental Engineering
If the total hardness of water is greater than its total alkalinity, the carbonate hardness will be equal to

Total hardness total alkalinity
Non carbonate hardness
Total hardness
Total alkalinity

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MORE MCQ ON Environmental Engineering

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