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Environmental Engineering in CE

Environmental Engineering in CE
Septic tanks are used for the __________ of the deposited solids.

None of these
Anaerobic decomposition
Separation
Aerobic decomposition

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Environmental Engineering in CE
Operating principle of cyclone separator is based on the action of __________ dust particles.

Electrostatic force on
Diffusion of
Gravitational force on
Centrifugal force on

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Environmental Engineering in CE
Corrosion in boilers can be prevented by

Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen and prevents corrosion
Deaeration of feed water
Enhancing pH of feed water by adding alkali
All of these

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Environmental Engineering in CE
TLV of mercury in potable (drinking) water is about __________ ppm.

5
0.001
0.1
1

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Environmental Engineering in CE
Nitrogen oxides (NOx) is not produced in the __________ industry.

Nitrogenous fertiliser
Detergent
Any of these
Nitric acid making

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Environmental Engineering in CE
Noise level inside a jet air liner in normal flight is about __________ decibels.

100
145
125
80

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