Chemical Engineering MCQs

Page No. 289

High temperature carbonisation of coal produces__________________?


aInferior coke compared to low temperature carbonisation


bLess of gases compared to liquid products


cLarge quantity of tar compared to low temperature carbonisation


dNone of these


View Answer None of these

Gobar gas constitutes mainly of___________________?


aCH4 & CO2


bCO & CO2


cCH4 & N2


dCO & N2


View Answer CH4 & CO2

Which of the following coal gasification processes will produce gas having maximum methane content ?


aWinkler process


bLurgi process


cKopper-Totzek process


dAll can produce same methane content


View Answer Lurgi process

During the carbonisation of coal__________________?


aAll tar is evolved at 700°C


bHard semi-coke starts shrinking at 600°C


cA


dAll A., B. and C.


View Answer All A., B. and C.

A coal that softens and fuses on heating is_________________?


aClassified


bCarbonised


cCaking


dNon-caking


View Answer Caking

Main use of soft coke is as _______________ fuel?


aDomestic


bBlast furnace


cFoundry


dNone of these


View Answer Domestic

Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)?


a150


b1500


c3500


d5000


View Answer 1500

Height of coke oven is limited (say maximum upto 7 metres) mainly by the_____________________?


aProblem of uniform heating along its height


bStructural strength of silica bricks


cProblem in door cleaning


dBuckling of ram of pusher car at the time of coke pushing



Steam is intermittently admitted into the fuel bed during the production of producer gas to__________________?


aConvert CO to CO2


bIncrease the combustion rate


cIncrease the gas production rate


dMinimise the chances of clinker formation



Which of the following coke has the least percentage of ash ?


aPetroleum coke


bBeehive coke


cFoundry coke


dMetallurgical coke


View Answer Petroleum coke

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