Chemical Engineering MCQs

Page No. 274

Coal is heated in presence of air to a temperature of about _______________ °C, while determining its ash content for proximate analysis?


a500


b750


c950


d1100


View Answer 750

Beehive coke oven________________?


aFacilitates by-products recovery


bTakes 2-3 days for coking of coal but requires no external fuel for heating


cGives larger yield of coke (around 85%) as compared to by-product ovens


dProduces coke with very poor strength



Gross and net calorific value of a fuel will be the same__________________?


aIf its ash content is zero


bIf its carbon content is very low


cIf its hydrogen/hydrogen compound content is zero


dUnder no circumstances



Commercial production of petrol from coal (as practised in a factory at Sasol in South Africa) is done by the ________________ of coal?


aHydrogenation


bGasification


cCarbonisation


dNone of these


View Answer Hydrogenation

Fussain _____________________?


aIs friable, charcoal like substance


bHas highest fixed carbon and lowest volatile matter content of all the four banded components of coal


cIs non-coking, but when blended with highly coking coal, controls its swelling and produces high strength coke on carbonisation


dAll A., B. and C.


View Answer All A., B. and C.

Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?


a71%


bIn between 37 & 71%


cNone of these


dAll A., B. and C.


View Answer In between 37 & 71%

Quantity of coke produced from metallurgical coal may be around _____________ percent?


a30


b50


c75


d95


View Answer 75

The liquid used for the washing of coal in an industrial coal washery is a mixture of water and ____________________?


aCarbon tetrachloride


bSand (40%)


cMineral oil of high viscosity & specific gravity (1.6)


dNone of these


View Answer Sand (40%)

Which of the following constituents of coal is the most important in the production of coke ?


aMoisture


bAsh


cVolatiles


dCarbon


View Answer Carbon

The combustion reaction, C + O2 = CO2, is ___________________?


aExothermic


bEndothermic


cAutocatalytic


dNone of these


View Answer Exothermic

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