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Environmental Engineering in CE

Environmental Engineering in CE
The pH value of potable water should be between

1 to 1.5
4 to 5
6.5 to 8
13 to 14

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Environmental Engineering in CE
The destruction of water-borne pathogens is termed as disinfection of water. Which of the following is a water disinfectant?

Alkalis
Chlorine
Benzene hexachloride
Alkyl benzene sulphonate (ABS)

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Environmental Engineering in CE
Scale formation in boiler is controlled by

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

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Environmental Engineering in CE
Presence of __________ in water stream are deleterious to aquatic life.

Suspended solids
Heavy metals and cynides
All of these
Soluble and toxic organics

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

Pipe vibrations
Boundary layer separation
Fluctuation in liquid flow
Cavitation

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Environmental Engineering in CE
In large thermal power stations very fine particulates present in flue gas are removed by

Bag filter
Dust catcher
Wet scrubber
Electrostatic precipitators

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