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Environmental Engineering in CE

Environmental Engineering in CE
The pH value of oxidised sewage is about

13.4
7.3
1.8
6.2

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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
70
100
30

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Environmental Engineering in CE
Dose of chlorine for disinfection of water is about __________ mg/litre of water.

0.01
0.3
1
0.1

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Environmental Engineering in CE
Which of the following is the most efficient for removal of very finely divided suspended solids and colloidal matter from the polluted water stream?

Circular clarifier
Mechanical flocculation
Sedimentation tank
Chemical coagulation

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Environmental Engineering in CE
TLV of ozone (O₃) and phosgene (COCl₂) in air is __________ ppm.

100
0.1
25
1000

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Environmental Engineering in CE
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?

Silica gel
Pulverised limestone
Bog iron (iron oxide)
Active carbon

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