Chemical Engineering MCQs

Page No. 261

Hot face insulating linings of high purity alumina fused mullite are used, where_________________?


aVery high temperatures are involved


bHighly reducing conditions are involved


cPresence of iron or silica is harmful


dAll A., B. and C.


View Answer All A., B. and C.

Dry mix hydraulic compositions of refractory aggregates with suitable bonding materials are called refractory_________________?


aMortars


bCements


cCastables


dNone of these


View Answer Castables

Cermets are____________________?


aComposite material containing both ceramic & metallic constituents


bHaving high strength & resistance to high temperature


cUsed in space vehicles, missiles & nuclear energy plants


dAll A., B. and C.


View Answer All A., B. and C.

To resist spalling tendency, a refractory should have________________?


aGreater diffusivity


bLow specific heat


cLow thermal co-efficient of expansion


dAll A., B. and C.


View Answer All A., B. and C.

High refractoriness of refractory bricks means, that it has a________________?


aHigh spalling resistance


bLow spalling resistance


cHigh resistance to fusion


dLow porosity



Spalling resistance of a refractory cannot be increased by ____________________?


aIncreasing its porosity


bUsing a coarser grog during its manufacture


cDecreasing its thermal co-efficient of expansion


dMaking it denser


View Answer Making it denser

Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?


aHigh refractoriness


bHigh resistance to spalling


cHigh strength and density


dAll A., B. and C.


View Answer High refractoriness

Cold crushing strength of refractories depends upon its_________________?


aComposition


bTexture


cFiring temperature


dAll A., B. and C.


View Answer All A., B. and C.

Maximum apparent porosity of magnesite bricks is about _____________ percent?


a8


b24


c44


d58


View Answer 24

Chromite refractories are used in_______________?


aBottom of soaking pits


bBetween acid & basic linings in basic open hearth furnaces to prevent their chemical action with each other


cBoth A. & B.


dNeither A. and B.


View Answer Both A. & B.

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