Chemical Engineering · all questions

Environmental Engineering
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307

Questions

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Q141

Pollution by particulate matter emission in the atmosphere does not take place during metal

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Q142

Pick out the correct statement.

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Q143

Main pollutant present in automobile exhaust is

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Q144

Biological oxidation ponds remove organic matters present in the polluted water by

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Q145

High noise levels produced during operation of fans and compressors can be reduced by using

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Q146

Pick out the wrong statement.

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Q147

Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is

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Q148

Fresh sewage is __________ in nature.

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Q149

Threshold limit value (TLV) of CO in air is __________ ppm.

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Q150

Photochemical smog is formed from automobile exhaust

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Q151

Exposure to SO₂ containing chimney gases results in the

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Q152

The type of bacteria which is active in trickling filter during biological treatment of sewage is the __________ bacteria.

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Q153

The main type of sludge gas evolved during sewage treatment in Imhoff tank is

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Q154

There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.

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Q155

Global warming may result in

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Q156

Ambient noise level can be reduced by __________ decibels by planting trees (like coconut, neem etc.) near public utility buildings (like hospitals & schools).

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Q157

Pick out the one which is not a chemical coagulant.

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Q158

Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes

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Q159

Which of the following industries discharge mercury as a pollutant?

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Q160

Which of the following is the most severe air pollutant?

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