Chemical Engineering MCQs

Page No. 304

Increase in ash content of blast furnace coke_________________?


aReduces its consumption in the furnace


bIncreases its consumption in the furnace


cDoes not affect its consumption in the furnace


dDecreases its hardness and abrasion resistance



The difference between total carbon and fixed carbon of coal will be minimum in case of___________________?


aLignite


bBituminous coal


cAnthracite


dHigh temperature coke (V.M < 0.5%)



In high temperature carbonisation (as compared to low temperature carbonisation) of coal___________________?


aCoke oven gas yield is more


bTar yield is less but free carbon in tar is more


cCalorific value of coke oven gas is less


dAll A., B. and C.


View Answer All A., B. and C.

The internal energy of the combustion products is ____________________ compared to that of reactants?


aMore


bLess


cEqual


dMore or less; (depends on the state of fuel.)


View Answer Less

Lignite is ___________________?


aA high rank coal


bA coking coal


cCan be used for gasification and steam generation


dA black banded coal which burns with a non-smoky yellowish flame



High pressure coal gasification is employed in ________________ process?


aLurgi


bKopper-Totzek


cWinkler


dNone of these


View Answer Lurgi

Use of pulverised coal in boiler furnace provides___________________?


aHigh calorific value


bBetter combustion


cSmokeless burning


dLess erosion on furnace walls


View Answer Better combustion

Which of the following fuel gases is heavier than air ?


aBlast furnace gas


bCoke oven gas


cNatural gas


dWater gas


View Answer Blast furnace gas

Cannel coal__________________?


aIs non-coking


bHas a high volatile matter content and burns with a luminous smoky flame


cIs a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named


dAll A., B. and C.


View Answer All A., B. and C.

In Lurgi coal gasifier___________________?


aCoking coals cannot be used


bLow carbon conversion efficiency is achieved


cEntrainment of solids is higher


dLarger quantity of coal can be processed



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