Chemical Engineering MCQs

Page No. 293

Washing of coal does not reduce its______________________?


aS & P content


bHeating value


cFusion point of ash


dNone of these


View Answer None of these

Preheating of coal charge for the coke ovens reduces the __________________?


aTime of carbonisation


bYield of gas and tar


cFuel consumption in coking


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3) ?


aProducer gas


bCarburetted water gas


cNatural gas


dLiquefied petroleum gas



Width of the coke oven towards coke side is slightly more than that on pusher side to____________________?


aFacilitate easy discharging of coke as it swells during carbonisation


bFacilitate uniform heating of the oven


cIncrease the output of the coke


dNone of these



Natural draught produced by a chimney depends upon the _____________________?


aDensity of the chimney gases


bHeight of the chimney


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Highly reactive coke have lower ___________________?


aPorosity


bCoke reactivity index (CRI)


cCritical air blast (CAB) value


dBoth B. and C.



_____________ prohibits the use of alcohols directly in petrol engines ?


aLow octane number


bHigh cost & availability


cLow flash point


dLow calorific value



Volumetric ratio of N2 to O2 in dry atmospheric air is ______________?


a0.21


b3.76


c4.76


d0.79


View Answer 3.76

Bituminous coal___________________?


aIgnites less easily than anthracite


bIs generally coking


cBurns with smoky yellow flame


dBoth B. and C.


View Answer Both B. and C.

Coalification means the ___________________?


aProcess of conversion of lignite into anthracite


bUnderground gasification of coal


cComplete combustion of coal


dDirect hydrogenation of coal



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