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Environmental Engineering in CE

Environmental Engineering in CE
Water filtration rate in a slow sand filter ranges from __________ litres/m²/hr.

4000 to 5000
1500 to 2500
100 to 200
10 to 20

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Environmental Engineering in CE
Maximum permissible residual chlorine in treated water should be __________ mg/litre.

0.001 to 0.01
2 to 3
5 to 10
02 to 0.3

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Environmental Engineering in CE
The ratio of oxygen available to the oxygen required for stabilisation of sewage is called the

Bacterial stability factor
Biological oxygen demand (BOD)
Relative stability
Oxygen ion concentration

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Environmental Engineering in CE
Hardy cross method of analysis of distribution system(i) Involves successive trials(ii) Takes economic aspects into account(iii) Is time consuming

(i) and (ii)
Only (i)
(i) and (iii)
All are correct

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Environmental Engineering in CE
Exposure to chemicals having carcinogenic properties cause

Asthma
Dermatitis (skin disorder)
Cancer
Asphyxiation (suffocation)

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Environmental Engineering in CE
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.

80
88
84
92

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