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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