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Environmental Engineering in CE

Environmental Engineering in CE
The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

Cavitation
Pipe vibrations
Fluctuation in liquid flow
Boundary layer separation

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Environmental Engineering in CE
Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes

Turbidity
Undesirable plant growth
Odour nuisances
Foaming

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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

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

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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 Nā‚‚ in contaminated air at which it acts as a natural asphyxant is ≄ __________ percent.

84
92
80
88

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Environmental Engineering in CE
Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?

Hydrogen
Carbon monoxide
Acetylene
Ammonia

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Environmental Engineering in CE
Tri-sodium phosphate is used in boiler water treatment to reduce

Turbidity
Caustic embrittlement
Suspended silica
Dissolved oxygen

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