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Environmental Engineering in CE

Environmental Engineering in CE
Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

25-30
43832
15-20
43961

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

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

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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

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

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Environmental Engineering in CE
Inhalation of silica dust by human being during hand drilling in mica mining, lead & zinc mining, silica refractory manufacture and in foundaries causes

Asphyxiation (suffocation)
All of these
Shortness of breath
Tuberculosis

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Environmental Engineering in CE
Which of the following industries discharge mercury as a pollutant?

Chloro-alkali industry
Tanneries
Beverage plant
Phosphoric acid plant

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

Enhancing pH of feed water by adding alkali
Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
Deaeration of feed water
All of these

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