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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