Chemical Engineering MCQs

Page No. 282

Low temperature oxidation of coal is accelerated by the____________________?


aStorage in large heaps


bStorage in compressed piles


cAbsence of porous or friable particles


dAll A., B. and C.



As the C/H ratio of the fuel increases, the amount of CO2 formed on combustion _______________ for the same percentage of excess air?


aDecreases


bIncreases


cRemain same


dMay increase or decrease depending on the type of fuel


View Answer Increases

Preheating of ______________ the flame temperature?


aThe gaseous fuel before combustion decreases


bCombustion air decreases


cEither the fuel or the air or both, increases


dEither the fuel or the air does not affect



With increase in the time of carbonisation at a particular temperature (say 1000°C), the ______________ percentage in coke oven gas increases?


aHydrogen


bMethane


cUnsaturated hydrocarbons


dAll A., B. and C.


View Answer Hydrogen

If CO2 is not fully absorbed by the KOH solution meant for its absorption in the orsat apparatus, it will appear as___________________?


aO2


bCO


cN2


dSO2


View Answer SO2

Presence of force moisture in coal is most disadvantageous during its __________________?


aTransportation and handling


bWashing


cPulverisation


dStorage


View Answer Pulverisation

High ash coals ____________________?


aAre soft & friable (poor strength and size stability)


bRequire longer time of carbonisation as ash offers resistance to heat transfer


cProduce larger quantity of coke oven gas


dNone of these



Moisture loss is determined by the _______________________?


aHumidity of combustion air


bMoisture content of fuel


cBoth A. and B.


dThe water formed by combustion reaction


View Answer Both A. and B.

Coal is heated in absence of air for 7 minutes at a temperature of about ______________ °C, during its volatile matter determination for proximate analysis?


a550


b750


c950


d1150


View Answer 950

Lurgi gasifier (high pressure gasifier) as compared to Kopper Totzek gasifier (atmospheric pressure gasifier) produces __________________?


aHigher amount of methane


bLower amount of hydrogen


cBoth A. and B.


dHigher amount of both methane and hydrogen


View Answer Both A. and B.

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