Chemical Engineering MCQs

Page No. 49

Which of the following is the most lethal water pollutant ?


a Phenol and cyanide


bChlorine


c Alkalis


dSuspended solids


View Answer Phenol and cyanide

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


aWet scrubber


bBag filter


c Electrostatic precipitators


dDust catcher



Presence of _____________ bacteria in water causes disease like typhoid?


a Aerobic


bPathogenic


cAnaerobic


dNon-pathogenic


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


b90


c800


d750


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


b0.2


c1.2


d 4.8


View Answer 0.2

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


aCarbon dioxide


bToluene


cCarbon disulphide


dAcetaldehyde


View Answer Carbon dioxide

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


aGrit chamber


bDetritus tank


cTrickling filter


d Skimming tank


View Answer Detritus tank

Corrosion in boilers can be prevented by _________________?


aDeaeration of feed water


bEnhancing pH of feed water by adding alkali


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


dAll A., B. and C.


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


bCyclone separator


c Electrostatic precipitator


dBag filter



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


aLow excess air


bVery high excess air


cGaseous fuel in the furnace


dLiquid fuel in the furnace


View Answer Very high excess air

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