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


dIncreases the flame temperature


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


dIs not possible on commercial scale



Fossil fuels mean___________________?


aSolid fuels


bLiquid fuels


cThose fuels which are found in the crust of earth


dPremature fuels with low calorific value



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