Chemical Engineering MCQs

Page No. 3

Pick the odd man out?


a Briquettes


bWood


cOil gas


dPitch creosote mixture


View Answer Wood

Ostwald charts are meant for__________________?


aComputing the excess/deficiency of combustion air


b Calculation of flue gas temperature


cComputation of flue gas analysis


d None of these



Which of the following furnaces will have maximum thermal efficiency ?


aSoaking pits


b Walking beam reheating furnace


c Boiler furnace


dRotary kilns


View Answer Boiler furnace

The function of an economiser in a boiler is to preheat the _____________________?


a Feedwater


bCombustion air


cPulverised coal


dFurnace oil


View Answer Feedwater

Which of the following is not an additive for flue gases from furnace to reduce its dewpoint ?


aAmmonia


bFine dolomite


cAlkaline powders


dNone of these


View Answer None of these

Out of the following fuels used in a furnace exhausting flue gas at a temperature of 600°C, the percentage stack loss will be maximum in case of complete combustion of_________________?


aFurnace oil with air


bFurnace oil with oxygen


cBlast furnace gas with air


d Blast furnace gas with oxygen



Fuel economy in an industrial furnace operation cannot be achieved by the use of__________________?


a Stoichiometric combustion air


b Non-preheated combustion air


cCombustion air not enriched with oxygen


dRecuperators



Pick out the wrong statement ?


a A ceramic material which becomes fluid upon heating and can be moulded in liquid/viscous


bCeramic materials do not undergo vitrification on heating


c Ceramic materials are brittle in nature


d Non-oxide ceramic materials generally act as a semi-conductor



Pick out the wrong statement?


a Fluxing material like lime is added in clay to reduce the vitrification temperature


bMain constituents of clay are alumina and silica


c Addition of sand in ceramic materials makes it non-plastic, increases its fusion point and reduces its shrinkage on burning


d Vitrification of fireclay material is done to increase its porosity



Which furnace employs preheating, heating and soaking zones ?


a Soaking pit


bReheating furnace


cOpen hearth furnace


dCupola


View Answer Reheating furnace

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