Chemical Engineering MCQs

Page No. 288

Hard coke is manufactured from___________________?


aLignite


bBituminous coal


cSemi-anthracite


dAnthracite


View Answer Bituminous coal

Which of the following is a primary fuel ?


aBlast furnace coke


bGasoline


cNatural gas


dWood charcoal


View Answer Natural gas

Coking time in narrow by-product coke ovens is around ______________ hours?


a18


b48


c8


d80


View Answer 18

Too much of excess air in combustion results in high___________________?


aFuel consumption for the same heat load


bStack gas temperature


cPercentage of oxygen in flue gases


dAll A., B. and C.


View Answer All A., B. and C.

Washing of coal is done to reduce the_________________?


aInherent impurities


bAdhering impurities


cMineral matter


dBoth B. and C.


View Answer Both B. and C.

Efficient burning of anthracite coal requires______________________?


aLow preheat of air


bFine grinding


cHigh excess air


dAll A., B. and C


View Answer Fine grinding

Water gas constitutes mainly of __________________?


aCO & H2


bCO & N2


cCO2 & H2


dCH4 & H2


View Answer CO & H2

Coke oven gas after passing through return electrostatic tar precipitator (RETP) is used for the_______________?


aHot scarfing of steel slabs


bMixing with blast furnace gas


cCoke oven battery heating


dSteel ladle drying



Benzene is used__________________?


aAs a motor fuel


bAs an explosive


cFor making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)


dAs a perfume



Which of the following constituents of a fuel does not contribute to its calorific value on combustion ?


aHydrogen


bSulphur


cCarbon


dNone of these


View Answer None of these

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