Chemical Engineering MCQs

Page No. 293

Washing of coal does not reduce its______________________?


aS & P content

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bHeating value

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cFusion point of ash

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dNone of these

✓


View Answer None of these

Preheating of coal charge for the coke ovens reduces the __________________?


aTime of carbonisation

✖


bYield of gas and tar

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cFuel consumption in coking

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3) ?


aProducer gas

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bCarburetted water gas

✖


cNatural gas

✖


dLiquefied petroleum gas

✓



Width of the coke oven towards coke side is slightly more than that on pusher side to____________________?


aFacilitate easy discharging of coke as it swells during carbonisation

✓


bFacilitate uniform heating of the oven

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cIncrease the output of the coke

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dNone of these

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Natural draught produced by a chimney depends upon the _____________________?


aDensity of the chimney gases

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bHeight of the chimney

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cBoth A. and B.

✓


dNeither A. nor B.

✖


View Answer Both A. and B.

Highly reactive coke have lower ___________________?


aPorosity

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bCoke reactivity index (CRI)

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cCritical air blast (CAB) value

✓


dBoth B. and C.

✖



_____________ prohibits the use of alcohols directly in petrol engines ?


aLow octane number

✖


bHigh cost & availability

✓


cLow flash point

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dLow calorific value

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Volumetric ratio of N2 to O2 in dry atmospheric air is ______________?


a0.21

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b3.76

✓


c4.76

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d0.79

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View Answer 3.76

Bituminous coal___________________?


aIgnites less easily than anthracite

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bIs generally coking

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cBurns with smoky yellow flame

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dBoth B. and C.

✓


View Answer Both B. and C.

Coalification means the ___________________?


aProcess of conversion of lignite into anthracite

✓


bUnderground gasification of coal

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cComplete combustion of coal

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dDirect hydrogenation of coal

✖



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