Chemical Engineering MCQs

Page No. 281

Which of the following would require maximum amount of % excess air for complete combustion ?


aCoke oven gas


bFurnace oil


cPulverised coal


dLump coal (fixed on chain grate)



Coking time in a commercial high temperature coal carbonisation plant is about ______________ hours?


a6


b18


c28


d36


View Answer 18

With increase in C/H ratio of a fuel, the dew point of flue gases______________________?


aIncreases


bDecreases


cRemain same


dMay increase or decrease; depends on the type of fuel


View Answer Decreases

High temperature carbonisation of coal takes place at _______________ °C?


a2000


b600


c1100


d1600


View Answer 1100

When the coal is heated in absence of air, it is called its ________________?


aDeoxidation


bGasification


cCoalification


dCarbonisation


View Answer Carbonisation

Out of the following fuels, the difference between gross and net calorific value will be minimum in case of___________________?


aCoke oven gas


bWater gas


cNatural gas


dBlast furnace gas


View Answer Blast furnace gas

A good quality coal should have ___________________?


aLow fusion point of ash


bHigh ash content


cHigh sulphur


dNone of these


View Answer None of these

Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around _______________ percent?


a80 and 97


b95 and 100


c40 and 70


d25 and 97


View Answer 80 and 97

Which of the following is a measure of the agglutinating (i.e., binding) property of coal ?


aThickness of plastic layer


bCaking index


cSwelling index


dGray-king index


View Answer Caking index

By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of_______________?


aTar


bBenzol


cAmmonia


dNone of these


View Answer Ammonia

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