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Environmental Engineering in CE

Environmental Engineering in CE
In sewage treatment, its sedimentation is speeded up by commonly adding

Lime
Sodium sulphate
Copper sulphate
Hydrochloric acid

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Environmental Engineering in CE
Which of the following is not a source of ozone emission in the atmosphere?

Dermatological photo-therapy equipments
High voltage electrical equipments
Refrigerators
Xerox machines

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Environmental Engineering in CE
Scale formation in boiler is controlled by

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

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Environmental Engineering in CE
Particles having diameter greater than 75 μm (micrometer = 10-6 mm) are called

Dust
Grit
Smoke
Powder

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Environmental Engineering in CE
Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?

Dust catcher (gravity type)
Bag filter
Hollow wet scrubber
Cyclone separator

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Environmental Engineering in CE
Which is the most widely used coagulant for the treatment of turbid water?

Sodium aluminate
Alum (aluminium sulphate)
Lime
Ferric chloride

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