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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following is the most lethal water pollutant?

Chlorine
Alkalis
Phenol and cynide
Suspended solids

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

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

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Environmental Engineering in CE
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes

Nervous depression
All of these
Paralysis of muscles & loss of appetite
Gastritis & diarrhea

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Environmental Engineering in CE
White smoke coming out of the chimney of a furnace indicates the use of

Liquid fuel in the furnace
Very high excess air
Low excess air
Gaseous fuel in the furnace

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

Suspended silica
Turbidity
Dissolved oxygen
Caustic embrittlement

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Environmental Engineering in CE
Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

Of increased diameter
Both A & B
With greater number of blades
Neither A nor B

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