Chemical Engineering MCQs

Page No. 281

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


aCoke oven gas

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bFurnace oil

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cPulverised coal

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dLump coal (fixed on chain grate)

✓



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


a6

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b18

✓


c28

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d36

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View Answer 18

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


aIncreases

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bDecreases

✓


cRemain same

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dMay increase or decrease; depends on the type of fuel

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View Answer Decreases

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


a2000

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b600

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c1100

✓


d1600

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View Answer 1100

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


aDeoxidation

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bGasification

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cCoalification

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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

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bWater gas

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cNatural gas

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dBlast furnace gas

✓


View Answer Blast furnace gas

A good quality coal should have ___________________?


aLow fusion point of ash

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bHigh ash content

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cHigh sulphur

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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

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c40 and 70

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d25 and 97

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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

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bCaking index

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cSwelling index

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dGray-king index

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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

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bBenzol

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cAmmonia

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dNone of these

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View Answer Ammonia

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