Chemical Engineering MCQs

Page No. 64

Presence of high concentration of ozone and smog in atmospheric air causes the __________________?


aEmbrittlement & decrease of folding resistance of paper

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b Cracking of rubber products

✓


cFading of dye on textiles

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dDamage of electrical insulator on high tension power line

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Main pollutants released from petroleum refineries is__________________?


aCO, SO2 & H2S

✓


b CO2, NO & SO3

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cCO2, H2S & NO2

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dSO3, NO2 & CO2

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View Answer CO, SO2 & H2S

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?


aCoal ash

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bPotassium cyanide

✓


c Ortho-xylene

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dNone of these

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View Answer Potassium cyanide

In sewage treatment, its sedimentation is speeded up by commonly adding__________________?


aHydrochloric acid

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bLime

✓


c Copper sulphate

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d Sodium sulphate

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View Answer Lime

What are the methods of treatment & disposal of radioactive wastes ?


aEvaporation & chemical precipitation

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bBiological methods & adsorption in ion exchange materials

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cFixing into a solid mass with cement and sinking deep in the sea

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dAll A., B. & C.

✓


View Answer All A., B. & C.

Nitrogen oxides (NOx) is not produced in the ______________ industry?


aNitric acid making

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bNitrogenous fertiliser

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cDetergent

✓


dAny of these

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View Answer Detergent

TLV of ammonia, nitrogen dioxide and phenol vapor in air is ______________ ppm ?


a5

✓


b100

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c1000

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d 2000

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View Answer 5

In water treatment, alum [Al2(SO4)3] is used for the process of __________________?


aFiltration

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bCoagulation

✓


cSedimentation

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dDisinfection

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View Answer Coagulation

Which of the following is not a secondary air pollutant ?


a Ozone

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bPhotochemical smog

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cSulphur dioxide

✓


dAll A., B. & C.

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View Answer Sulphur dioxide

Which of the following dust collection equipments is the least efficient (for sub-micronic particles) ?


a Dust catcher (gravity type)

✓


bCyclone separator

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cBag filter

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dHollow wet scrubber

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