Chemical Engineering MCQs

Page No. 299

Fixed carbon in coal is defined as______________________?


aThat present in volatile matters

✖


bThe total quantity of carbon present in the coal

✖


cHundred minus the percentage of volatile matter, ash and moisture

✓


dThe one which is present in the residue after combustion

✖



During combustion of gaseous fuels, deficiency of air_________________?


aLengthens the flame

✓


bTends to shorten the flame

✖


cDoes not affect the flame length

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dIncreases the flame temperature

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View Answer Lengthens the flame

Calorific value of furnace oil is about _______________ Kcal/kg?


a10,000

✓


b15,000

✖


c5,000

✖


d20,000

✖


View Answer 10,000

Air/gas ratio for complete combustion will be the highest for__________________?


aLPG

✓


bGobar gas

✖


cCoke oven gas

✖


dCarburetted water gas

✖


View Answer LPG

Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?


aBenzol

✖


bPitch-creosote mixture (PCM)

✖


cNaphthalene

✖


dEthylene

✓


View Answer Ethylene

The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always___________________?


a1

✖


b< 1

✓


c> 1

✖


dUnpredictable

✖


View Answer < 1

A good coking coal should have high ______________ content?


aAsh

✖


bSulphur & phosphorus

✖


cMoisture

✖


dNone of these

✓


View Answer None of these

Gross & net calorific value is the same for___________________?


aBlast furnace gas

✖


bCoke oven gas

✖


cL.D. converter gas

✓


dNone of these

✖


View Answer L.D. converter gas

Removal of hydrogen from coke oven gas ___________________?


aIncreases its calorific value

✓


bDecreases its calorific value

✖


cDoes not alter its calorific value

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dIs not possible on commercial scale

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Fossil fuels mean___________________?


aSolid fuels

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bLiquid fuels

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cThose fuels which are found in the crust of earth

✓


dPremature fuels with low calorific value

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