Chemical Engineering MCQs

Page No. 283

Yield of blast furnace gas is about _______________ Nm3 /ton of pig iron?


a300


b2000


c5000


d10000


View Answer 2000

Emission of dense white smoke out of the chimney of a thermal power plant is an indication of the use of__________________?


aLess air for combustion


bCorrect amount of air for combustion


cToo much air for combustion


dPulverised coal in boilers



Which of the following is a rich fuel gas ?


aProducer gas


bCoal gas from underground gasification of coal


cRefinery gases


dNone of these


View Answer Refinery gases

With increases in carbonisation temperature_______________________?


aCoke even gas yield increases


bTar yield increases


cHydrogen percentage in the coke oven gas decreases


dMethane percentage in the coke oven gas increases



A liquid/gaseous fuel containing hydrocarbons and high amount of sulphur is burnt with 40% excess air. The flue gas still contains large amount of carbon monoxide. This may be due to the_________________?


aPresence of large quantity of hydrogen in the fuel


bLow calorific value of the fuel


cHigh sulphur content in the fuel


dLack of thorough mixing of fuel with air



Which of the following fertilisers is produced in the by-products recovery (from coke oven gas) plant attached to an integrated steel plant ?


aAmmonium sulphate


bAmmonium nitrate


cAmmonium phosphate


dNone of these


View Answer Ammonium sulphate

Main constituent of natural gas is ________________?


aCH4 (upto 90%)


bC2H6


cC3H8


dH2


View Answer CH4 (upto 90%)

Froth floatation is used for_________________?


aWashing fine coal dust (< 0.5 mm size)


bWashing lump coal (> 80 mm size)


cRemoving ash from the coal based on difference in specific gravity of coal and ash


dAll A., B. and C.



Anthracite can be used for___________________?


aRecarbonising steel


bMaking carbon electrodes


cBlending with highly coking coal to check its swelling which helps in saving coke even walls from damage and to produce high strength coke


dAll A., B. and C.


View Answer All A., B. and C.

Of the total tar present in raw coke oven gas, the tar recovered in primary cooler is about _______________ percent?


a5


b25


c55


d75


View Answer 25

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