Chemical Engineering MCQs

Page No. 2

Regenerators are normally provided in the____________________?


aGlass melting furnace


bOpen hearth furnace


cBy product coke ovens


d All A., B. and C.


View Answer All A., B. and C.

Pick out the wrong statement ?


a Electrical conductivity of refractory is not important, when these are to be used in electrica


bGraphite and metals are the good electrical conductor among the refractories and others are all


cRefractories used for lining electrical furnaces should ordinarily have very low electrical conductivity


d Electrical conductivity of porous refractory material is low



Overfire burning in a furnace is a phenomenon characterised by____________________?


aSupply of excess fuel


bSupply of excess air


cBurning carbon monoxide and other incombustible in upper zone of furnace by supplying


dNone of these



Pick out the wrong statement?


aSand & coke is the main raw material for the manufacture of silicon carbide


bCarbon refractories cannot be used in the furnaces operating under reducing conditions


cMullite can be obtained by the heating of alusite, kyanite or sillimanite


dSilica occurs in nature in all cellular, amorphous or crystalline form



Pick out the wrong statement ?


aRefractories used in muffle furnace should have low thermal conductivity


bThe electrical resistivity of refractories drops rapidly with rise in temperature


cFor reducing spalling tendency, the refractory should be well fired and its porosity should be


dRefractoriness under load (RUL) of a refractory is always less than its refractoriness



Pick out the wrong statement?


a Insulating refractories used in place of regular refractory bricks are usually called light weight


bGraphite refractories are also called plumbago refractories


cSuperduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28


dCalcined magnesite is also called dead burnt magnesite



Pick out the wrong statement ?


aSurface tension of a liquid is because of the difference in magnitude of adhesive & cohesive


b A hydrometer used for the determination of specific gravities of liquids works on the principle


c In case of unsteady fluid flow, the velocity at any given point does not change with time


d Turbulent fluid flow is characterised by the rapid fluctuation of instantaneous pressure & velocity at a point



Which is a continuous furnace ?


a Coke ovens


bAnnealing furnace


cGlass tank furnace


d None of these


View Answer Glass tank furnace

Turndown ratio of a burner gives an idea of the ______________ in the furnace?


aRange of fuel firing rates


b Volume of the combustion chamber


cMaximum heat input rate only


dMinimum heat input rate only



A refractory wall separating the stock and the source of heat is provided in a__________________?


aUpdraft kiln


bMuffle furnace


c Continuous furnace


d None of these


View Answer Muffle furnace

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