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Environmental Engineering in CE

Environmental Engineering in CE
Deaeration of high pressure boiler feed water is done to reduce

Foaming from boilers
Its silica content
Its dissolved oxygen content
Caustic embrittlement

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Environmental Engineering in CE
If the coli form bacteria is present in a sample of water, then the coli-form test to be conducted is(i) Presumptive coli-form test(ii) Confirmed coli-form test(iii) Completed coli-form test

Both (i) and (ii)
Both (i) and (iii)
All (i), (ii) and (iii)
Only (i)

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Environmental Engineering in CE
Iron & manganese present as pollutant in water can not be removed by

Ion exchange process
Oxidation followed by settling & filtration
Chlorination
Lime soda process or manganese zeolite process

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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
84
88
92

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Environmental Engineering in CE
Scale formation in boiler is controlled by

Eliminating H₂S in feed water
Reduction in hardness, silica & alumina in feed water
Keeping the pH value of feed water just below 7
Preheating of feed water

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Environmental Engineering in CE
The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.

10
1000
2000
200

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