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Environmental Engineering in CE

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

Wet scrubber
Bag filter
Electrostatic precipitators
Dust catcher

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

Powder
Grit
Smoke
Dust

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

Sodium sulphate
Hydrochloric acid
Copper sulphate
Lime

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Environmental Engineering in CE
The function of skimming tank in sewage treatment is to remove __________ substances.

Oil & fatty
Dissolved solid
Suspended solid
Gritty & inorganic

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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.

3
30
70
100

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Environmental Engineering in CE
The upper layer of atmosphere is called the

Troposphere
Stratosphere
None of these
Ionosphere

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