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Environmental Engineering in CE

Environmental Engineering in CE
Which of the following fine dust removal equipments is the most efficient?

Electrostatic precipitator
Cyclone separator
Bag filter
Scrubber

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Environmental Engineering in CE
Sulphur dioxide present in the industrial chimney exhaust gases causes

Respiratory & lung disease
All of these
Reduction in plant's productivity owing to acid rain
Corrosion of building materials

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Environmental Engineering in CE
In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.

1 to 2
9 to 10
15 to 20
4 to 5

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Environmental Engineering in CE
The main industrial source of emission of hydrogen sulphide air pollutant is

Coal based thermal power plants
Petroleum refineries
Metallurgical roasting & smelting plant
Pulp and paper plant

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Environmental Engineering in CE
Major sources of noise in furnace operation arises from air inspirators, combustion, side wall vibrations and fluctuation in the process heat load. A 50% increase in fuel firing rate may increase the furnace noise level by about __________ decibels.

70
100
3
30

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Environmental Engineering in CE
Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by

Chemical coagulation
Centrifugation
Ultrafiltration
Floatation & skimming

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