Chemical Engineering MCQs

Page No. 2

Regenerators are normally provided in the____________________?


aGlass melting furnace

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bOpen hearth furnace

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cBy product coke ovens

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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

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

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

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d Electrical conductivity of porous refractory material is low

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Overfire burning in a furnace is a phenomenon characterised by____________________?


aSupply of excess fuel

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bSupply of excess air

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

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dNone of these

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Pick out the wrong statement?


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

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

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

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

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Pick out the wrong statement ?


aRefractories used in muffle furnace should have low thermal conductivity

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bThe electrical resistivity of refractories drops rapidly with rise in temperature

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

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

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Pick out the wrong statement?


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

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bGraphite refractories are also called plumbago refractories

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

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dCalcined magnesite is also called dead burnt magnesite

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Pick out the wrong statement ?


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

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

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

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

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Which is a continuous furnace ?


a Coke ovens

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bAnnealing furnace

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cGlass tank furnace

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d None of these

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View Answer Glass tank furnace

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


aRange of fuel firing rates

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b Volume of the combustion chamber

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cMaximum heat input rate only

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dMinimum heat input rate only

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


aUpdraft kiln

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bMuffle furnace

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c Continuous furnace

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d None of these

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View Answer Muffle furnace

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