Chemical Engineering MCQs

Page No. 307

Fuel consumption in coke making can be reduced by___________________?


aPreheating, blending and de-ashing the coal

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bStamped charging of coal

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cDry quenching of coke

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dAll A., B. and C.

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View Answer All A., B. and C.

The cooling medium used in dry quenching of coke is___________________?


aNitrogen

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bAir

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cPhenolic water

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dCarbon dioxide

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View Answer Nitrogen

Proximate analysis of coal determines its ______________ content?


aMoisture, ash, sulphur & volatile matterMoisture, volatile matter, ash & fixed carbon

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bMoisture, volatile matter, ash & fixed carbon

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cMoisture, sulphur, nitrogen & fixed carbon

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dNone of these

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The maximum percentage of CO2 in a flue gas (from a carbonaceous fuel) can be_________________?


a21

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b77

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c79

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d29

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View Answer 21

Yield of pitch from distillation of high temperature tar is around _____________ percent?


a10

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b25

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c25

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d90

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View Answer 25

Hardgrove Grindability index of four coal samples are given below. Which of them is the easiest to grind ?


a50

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b70

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c85

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d100

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View Answer 100

Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?


a3 & 10

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b10 & 3

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c10 & 20

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d15 & 8

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View Answer 10 & 3

‘Fat’ coal means a coal having ___________________?


aLow calorific value

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bHigh volatile matter

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cLow ash content

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dNon smoking tendency

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View Answer High volatile matter

Naphthalene is removed from coke oven gas by________________?


aScrubbing with wash oil (a petroleum product)

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bAdsorbing on bog iron bed

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cAbsorbing in vetro-coke solution

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dNone of these

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Octane number of 2, 2, 4 – trimethyl pentane is __________________?


a0

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b100

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cIn between 0 and 100

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dMore than 100

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View Answer 100

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