Chemical Engineering MCQs

Page No. 261

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


aVery high temperatures are involved

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bHighly reducing conditions are involved

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cPresence of iron or silica is harmful

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dAll A., B. and C.

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View Answer All A., B. and C.

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


aMortars

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bCements

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cCastables

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dNone of these

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View Answer Castables

Cermets are____________________?


aComposite material containing both ceramic & metallic constituents

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bHaving high strength & resistance to high temperature

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cUsed in space vehicles, missiles & nuclear energy plants

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dAll A., B. and C.

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View Answer All A., B. and C.

To resist spalling tendency, a refractory should have________________?


aGreater diffusivity

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bLow specific heat

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cLow thermal co-efficient of expansion

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dAll A., B. and C.

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View Answer All A., B. and C.

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


aHigh spalling resistance

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bLow spalling resistance

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cHigh resistance to fusion

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dLow porosity

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Spalling resistance of a refractory cannot be increased by ____________________?


aIncreasing its porosity

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bUsing a coarser grog during its manufacture

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cDecreasing its thermal co-efficient of expansion

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dMaking it denser

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View Answer Making it denser

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


aHigh refractoriness

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bHigh resistance to spalling

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cHigh strength and density

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dAll A., B. and C.

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View Answer High refractoriness

Cold crushing strength of refractories depends upon its_________________?


aComposition

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bTexture

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cFiring temperature

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dAll A., B. and C.

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View Answer All A., B. and C.

Maximum apparent porosity of magnesite bricks is about _____________ percent?


a8

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b24

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c44

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d58

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View Answer 24

Chromite refractories are used in_______________?


aBottom of soaking pits

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

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cBoth A. & B.

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dNeither A. and B.

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View Answer Both A. & B.

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