Chemical Engineering · all questions

Environmental Engineering
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Q241

Lagoons used for purification of polluted water

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Q242

Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?

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Q243

Presence of __________ bacteria in water causes disease like typhoid.

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Q244

Brown spots in fabrics will be caused by washing with water containing large amount of .

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Q245

Soluble silica present in boiler feed water can be removed by

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Q246

Deaeration of high pressure boiler feed water is done to reduce

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Q247

Salt content in sea water is about __________ percent.

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Q248

Thermal pollution due to excessive heat & temperature in the working place causes

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Q249

Which of the following processes is involved in the biochemical treatment of sewage effluents?

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Q250

Ionisation potential employed in the industrial electrostatic precipitator is of the order of

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Q251

Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan

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Q252

Growth of __________ is promoted by the presence of manganese in water.

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Q253

The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

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Q254

Pick out the wrong statement.

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Q255

Removal of __________ results from the disinfection of water.

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Q256

Inhalation of lead compounds present in the automobile exhausts (using leaded petrol) causes

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Q257

Polyvinyl chloride containers are not suitable for storing

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Q258

In the context of the chemical process industries, the term BOD is normally associated with the

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Q259

Which of the following is not a weightless pollutant?

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Q260

Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.

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