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Environmental Engineering in CE

Environmental Engineering in CE
Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre.

1050
2
332
42

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Environmental Engineering in CE
Algae growth in water is controlled by

Chlorination
Bleaching
Deoxidation
Aeration

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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
Which of the following radioactive wastes emits all α, β & γ rays and hence is the most hazardous of all radioactive emitters?

Ra-226
Au-198
Sr-90
I-131

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Environmental Engineering in CE
Which of the following is the most detrimental for water used in high pressure boiler?

Phenol
Turbidity
Silica
Dissolved oxygen

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Environmental Engineering in CE
Which of the following plants does not emit appreciable amount of SO₂ in atmosphere?

Nitric acid plant
Thermal power plant
Sulphuric acid plant
Petroleum refinery

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