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Environmental Engineering in CE

Environmental Engineering in CE
Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.

120
90
20
60

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Environmental Engineering in CE
A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the

Green house
Atmospheric effect
Ionosphere
Global warming

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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
30
3
100

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Environmental Engineering in CE
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.

Hydrogen sulphides
Hydrogen flouride
Hydrocarbons
Nitrogen dioxide

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Environmental Engineering in CE
The resistance of water to the passage of light through it is a measure of the

Turbidity
Hardness
Dissolved gases
Color

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Environmental Engineering in CE
COD of raw municipal sewage may be in the range of about __________ mg/litre.

1-2
5-10
1500-2500
90-120

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