Chemical Engineering MCQs

Page No. 313

Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal ?


aVitrain


bClarain


cDurain


dFussain


View Answer Vitrain

High sulphur content in a fuel ______________ of the flue gases?


aDecreases the dew point


bIncreases the dew point


cReduces the combustion efficiency by limiting the permissible temperature reduction


dBoth B. and C.


View Answer Both B. and C.

Low temperature oxidation of stored coal results in the________________?


aDecrease in its caking power & calorific value


bDecrease in its carbon & hydrogen content


cIncrease in its oxygen content


dAll A., B. and A.


View Answer All A., B. and A.

High rate of heating of coke ovens____________________?


aMay damage its walls due to abrupt excessive swelling of coal


bProduces larger size coke


cIncreases the time of carbonisation


dNone of these



combustion of pulverised coal compared to the lumpy coal __________________?


aProvides better control of furnace temperature


bFacilitates combustion with lower excess air


cProvides higher thermal efficiency & flame temperature


dAll A., B. & C.


View Answer All A., B. & C.

Supply of excess air for complete combustion of fuel is necessitated to facilitate___________________?


aIts thorough mixing with air


bAttainment of chemical equilibrium


cAttainment of high temperature


dNone of these



Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about ______________°C?


a70


b85


c105


d145


View Answer 105

Coke oven gas burns with a yellowish flame, because of the presence of __________________?


aCO2


bCH4


cH2


dNH3


View Answer CH4

With increase in moisture content of coal, its___________________?


aCalorific value increases


bCaking properties diminish


cSwelling during carbonisation becomes excessive


dNone of these



In general, the limit of inflammability/explosion limit of fuel gases is widened by the__________________?


aIncrease in gas pressure


bIncrease in temperature (i.e. preheating)


cUse of pure oxygen for combustion instead of air


dAll A., B. & C.


View Answer All A., B. & C.

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