Chemical Engineering MCQs

Page No. 278

Ultimate analysis of coal determines its _______________ content?


aCarbon, hydrogen, nitrogen & sulphur


bCarbon, ash, sulphur & nitrogen


cCarbon, sulphur, volatile matter & ash


dCarbon, volatile matter, ash & moisture



Higher efficiency in the combustion of solid fuel cannot be achieved by________________?


aProper fuel preparation


bKeeping the flue gas exhaust temperature very high


cAdopting efficient-fuel firing technique & equipment


dSupplying correct quantity of combustion air



If oxygen content in the flue gas rises too high, fuel is being wasted by _______________?


aIncomplete combustion


bDry gas/stack gas loss


cMoisture loss


dNone of these



During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the____________________?


aIncomplete combustion


bComplete combustion


cHigh oxygen in flue gas


dNone of these


View Answer Complete combustion

One kg of carbon for theoretically complete combustion requires ______________ kg of air?


a11.5


b0.5


c23


d12


View Answer 11.5

When incomplete combustion loss is high, the flue gas analysis shows large amount of ________________?


aCO2


bCO


cO2


dC


View Answer CO

Naphthalene recovered from coke oven gas is used___________________?


aAs moisture proof coating on fibres


bAs moth balls (insecticides)


cAs a fuel in furnaces


dFor making electrodes



Grindability index of a coal is 100. It implies that the ___________________?


aCoal can be pulverised with great difficulty


bCoal can’t be pulverised


cCoal can be easily pulverised


dPower consumption in grinding the coal will be very high



In high temperature carbonisation (as compared to low temperature carbonisation) of coal, the______________?


aGas yield is less


bTar yield is more


cIgnition temperature of coke produced is less


dAromatic content of tar produced is more



Which of the following is not a manufactured fuel ?


aFurnace oil


bBagasse


cSemi-coke


dKerosene


View Answer Bagasse

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