Chemical Engineering MCQs

Page No. 49

Which of the following is the most lethal water pollutant ?


a Phenol and cyanide

✓


bChlorine

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c Alkalis

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dSuspended solids

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View Answer Phenol and cyanide

In large thermal power stations very fine particulates present in flue gas are removed by___________________?


aWet scrubber

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bBag filter

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c Electrostatic precipitators

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dDust catcher

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Presence of _____________ bacteria in water causes disease like typhoid?


a Aerobic

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bPathogenic

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cAnaerobic

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dNon-pathogenic

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View Answer Pathogenic

As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is _____________ μg/m3.(μg-microgram)?


a10

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b90

✓


c800

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d750

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View Answer 90

Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about ______________ ppm (parts per million)?


a0.002

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b0.2

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c1.2

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d 4.8

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View Answer 0.2

Out of the following, TLV of _______________ is maximum (about 500 ppm)?


aCarbon dioxide

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bToluene

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cCarbon disulphide

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dAcetaldehyde

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View Answer Carbon dioxide

Fine grit present in sewage is removed in the _____________ during sewage treatment?


aGrit chamber

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bDetritus tank

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cTrickling filter

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d Skimming tank

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View Answer Detritus tank

Corrosion in boilers can be prevented by _________________?


aDeaeration of feed water

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bEnhancing pH of feed water by adding alkali

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c Feeding sodium sulphite or hydrazine phosphate to the boilers, which combines with oxygen

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dAll A., B. and C.

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View Answer All A., B. and C.

Most efficient and suitable dust removal equipment for removal of fly-ash from flue gas in a thermal power plant is the__________________?


aGravity settling chamber

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bCyclone separator

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c Electrostatic precipitator

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dBag filter

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White smoke coming out of the chimney of a furnace indicates the use of_________________?


aLow excess air

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bVery high excess air

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cGaseous fuel in the furnace

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dLiquid fuel in the furnace

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View Answer Very high excess air

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