Chemical Engineering MCQs

Page No. 303

When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?


aCarbonisation


bOxidation


cCoalification


dGasification


View Answer Gasification

Flue gas discharge velocity through chimney of a big thermal power plant may be around ________________ m/sec?


a0.5


b10


c50


d500


View Answer 10

Bomb calorimeter is used for the determination of calorific value of the _____________ fuels?


aGaseous


bSolid


cLiquid


dBoth B. and C.


View Answer Both B. and C.

Coke ovens in steel plant are heated by ___________________?


aElectricity


bCoke oven gas


cMixed gas


dBoth B. & C.


View Answer Both B. & C.

Soft coke is not ___________________?


aProduced by low temperature carbonisation of coal


bA domestic fuel


cUsed in blast furnaces


dNone of these



Percentage of hydrogen in coke oven gas may be around ___________________?


a10


b25


c45


d60


View Answer 60

A coal with high ash content is undesirable, as________________?


aIt is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber


bThe ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the ash


c The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes thereby reducing the heat transfer


dAll A., B. and C.


View Answer All A., B. and C.

Which of the following is the most poisonous gas ?


aCoke oven gas


bProducer gas


cBlast furnace gas


dL.D. converter gas


View Answer L.D. converter gas

Gross heating value of coal is ______________ the net heating value?


aHigher than


bLower than


cSame as


dEither A. or B.; depends on the type of coal


View Answer Higher than

Which of the following accentuates clinkering trouble on furnace grate burning coal ?


aLow reactivity of carbonised residue containing high proportions of iron & sulphur


bLow forced draught and fuel bed temperature


cThick fire bed and preheated primary air


dAll A., B. and C.


View Answer All A., B. and C.

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