Chemical Engineering MCQs

Page No. 313

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


aVitrain

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bClarain

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cDurain

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dFussain

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View Answer Vitrain

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


aDecreases the dew point

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bIncreases the dew point

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cReduces the combustion efficiency by limiting the permissible temperature reduction

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dBoth B. and C.

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View Answer Both B. and C.

Low temperature oxidation of stored coal results in the________________?


aDecrease in its caking power & calorific value

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bDecrease in its carbon & hydrogen content

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cIncrease in its oxygen content

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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

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cIncreases the time of carbonisation

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dNone of these

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combustion of pulverised coal compared to the lumpy coal __________________?


aProvides better control of furnace temperature

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bFacilitates combustion with lower excess air

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cProvides higher thermal efficiency & flame temperature

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dAll A., B. & C.

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View Answer All A., B. & C.

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


aIts thorough mixing with air

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bAttainment of chemical equilibrium

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cAttainment of high temperature

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dNone of these

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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

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b85

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c105

✓


d145

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View Answer 105

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


aCO2

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bCH4

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cH2

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dNH3

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View Answer CH4

With increase in moisture content of coal, its___________________?


aCalorific value increases

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bCaking properties diminish

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cSwelling during carbonisation becomes excessive

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dNone of these

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


aIncrease in gas pressure

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bIncrease in temperature (i.e. preheating)

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cUse of pure oxygen for combustion instead of air

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dAll A., B. & C.

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View Answer All A., B. & C.

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