Chemical Engineering MCQs

Page No. 288

Hard coke is manufactured from___________________?


aLignite

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bBituminous coal

✓


cSemi-anthracite

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dAnthracite

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View Answer Bituminous coal

Which of the following is a primary fuel ?


aBlast furnace coke

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bGasoline

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cNatural gas

✓


dWood charcoal

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View Answer Natural gas

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


a18

✓


b48

✖


c8

✖


d80

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View Answer 18

Too much of excess air in combustion results in high___________________?


aFuel consumption for the same heat load

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bStack gas temperature

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cPercentage of oxygen in flue gases

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Washing of coal is done to reduce the_________________?


aInherent impurities

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bAdhering impurities

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cMineral matter

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dBoth B. and C.

✓


View Answer Both B. and C.

Efficient burning of anthracite coal requires______________________?


aLow preheat of air

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bFine grinding

✓


cHigh excess air

✖


dAll A., B. and C

✖


View Answer Fine grinding

Water gas constitutes mainly of __________________?


aCO & H2

✓


bCO & N2

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cCO2 & H2

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dCH4 & H2

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View Answer CO & H2

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


aHot scarfing of steel slabs

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bMixing with blast furnace gas

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cCoke oven battery heating

✓


dSteel ladle drying

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Benzene is used__________________?


aAs a motor fuel

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bAs an explosive

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

✓


dAs a perfume

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


aHydrogen

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bSulphur

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cCarbon

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dNone of these

✓


View Answer None of these

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