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

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bFuel oil

✓


cBlast furnace gas

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dBituminous coal

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View Answer Fuel oil

Calorific value of ____________________?


aLight paraffinic fuel oils is equal to that of equivalent olefins

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

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cLight paraffinic fuel oils is higher than that of equivalent olefins

✓


dLight paraffinic fuel oils is lower than that of equivalent olefins

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


aFixed carbon

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bTotal carbon

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cHydrogen

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dNitrogen

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View Answer Fixed carbon

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


aLess reactive

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bStronger

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cSmaller in size

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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

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bAbradability

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cAgglutinating properties

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dResistance to impact breakage

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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

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b10

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c20

✓


d35

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View Answer 20

In low temperature carbonisation of coal, the________________?


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

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bVolatile matter in coke is zero

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cTemperature maintained is 700°C

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dYield of tar is about 3% of dry coal

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


aWinkler process

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bKopper-Totzek process

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cLurgi Process

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dNone of these

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View Answer Lurgi Process

Blast furnace gas constitutes mainly of_________________?


aN2 & CH4

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bN2 & H2

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cN2 & CO

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dCH4 & CO2

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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

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b12.5

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c0

✓


d10

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View Answer 0

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