Chemical Engineering MCQs

Page No. 292

Out of the following fuels, the difference between the net and gross calorific value is maximum in case of_________________?


aPitch


bFuel oil


cBlast furnace gas


dBituminous coal


View Answer Fuel oil

Calorific value of ____________________?


aLight paraffinic fuel oils is equal to that of equivalent olefins


bn-paraffin is lower than that of iso-paraffins of the same compounds


cLight paraffinic fuel oils is higher than that of equivalent olefins


dLight paraffinic fuel oils is lower than that of equivalent olefins



_____________ present in coal is not determined in its ultimate analysis ?


aFixed carbon


bTotal carbon


cHydrogen


dNitrogen


View Answer Fixed carbon

Coke made in narrower by-product coke ovens (as compared to wider ovens) is _____________________?


aLess reactive


bStronger


cSmaller in size


dAll A., B. & C.


View Answer All A., B. & C.

Gray King Assay and Swelling Index of a coal is a measure of its ____________________?


aSwelling characteristics


bAbradability


cAgglutinating properties


dResistance to impact breakage



Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300°) may be reduced by about ______________ percent as compared to the use of atmospheric combustion air?


a5


b10


c20


d35


View Answer 20

In low temperature carbonisation of coal, the________________?


aYield of coke oven gas is 290 Nm3 /ton dry coal


bVolatile matter in coke is zero


cTemperature maintained is 700°C


dYield of tar is about 3% of dry coal



Which of the following is a single stage, fixed bed high pressure coal gasification process ?


aWinkler process


bKopper-Totzek process


cLurgi Process


dNone of these


View Answer Lurgi Process

Blast furnace gas constitutes mainly of_________________?


aN2 & CH4


bN2 & H2


cN2 & CO


dCH4 & CO2


View Answer N2 & CO

Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO2, 20%CO and 10%O2. The percent excess oxygen used is __________________?


a20


b12.5


c0


d10


View Answer 0

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