Chemical Engineering MCQs

Page No. 307

Fuel consumption in coke making can be reduced by___________________?


aPreheating, blending and de-ashing the coal


bStamped charging of coal


cDry quenching of coke


dAll A., B. and C.


View Answer All A., B. and C.

The cooling medium used in dry quenching of coke is___________________?


aNitrogen


bAir


cPhenolic water


dCarbon dioxide


View Answer Nitrogen

Proximate analysis of coal determines its ______________ content?


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


bMoisture, volatile matter, ash & fixed carbon


cMoisture, sulphur, nitrogen & fixed carbon


dNone of these



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


a21


b77


c79


d29


View Answer 21

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


a10


b25


c25


d90


View Answer 25

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


a50


b70


c85


d100


View Answer 100

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


a3 & 10


b10 & 3


c10 & 20


d15 & 8


View Answer 10 & 3

‘Fat’ coal means a coal having ___________________?


aLow calorific value


bHigh volatile matter


cLow ash content


dNon smoking tendency


View Answer High volatile matter

Naphthalene is removed from coke oven gas by________________?


aScrubbing with wash oil (a petroleum product)


bAdsorbing on bog iron bed


cAbsorbing in vetro-coke solution


dNone of these



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


a0


b100


cIn between 0 and 100


dMore than 100


View Answer 100

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