Chemical Engineering MCQs

Page No. 268

_____________ is not a single oxide-refractory?


aZirconia


bSilicon carbide


cMagnesia


dNone of these


View Answer Silicon carbide

High alumina refractories are used in the ___________________?


aDome of blast furnace stoves


bElectric arc furnace roof


cGlass melting furnaces


dAll A., B. and C.


View Answer All A., B. and C.

Thermal spalling mainly occurs during _____________ of furnaces?


aCooling down


bWarming up


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Which is the stable form of silica upto 1470°C ?


aQuartz


bCristobalite


cTridymite


dNone of these


View Answer Tridymite

Cermets are combination of ceramic and metallic materials due to which they have high strength & resistance to high temperature. Cermets are used in the_______________?


aHearth of the blast furnace


bNuclear reactors, missiles & space crafts


cInsulation of high temperature furnaces


dRoof of electric furnaces



Zircon refractories have__________________?


aLow co-efficient of expansion


bHigh RUL (1600°C) and refractoriness (> 2000°C)


cHigh spalling resistance


dAll A., B. and C.


View Answer All A., B. and C.

Chromite refractories_____________________?


aAre bonded with lime and clay


b(Free from silica) have better thermal fatigue resistance than silica and magnesite refractories.


cAre resistant to basic slag


dAll A., B. and C.


View Answer All A., B. and C.

_____________ nozzles are used in continuous casting of steel?


aZircon


bThoria


cCarborundum


dBeryllia


View Answer Zircon

Which one expands on heating ?


aSilica bricks


bFireclay bricks


cBoth A. & B.


dNeither A. nor B.


View Answer Silica bricks

Ferromagnetic ceramic material is not used in the__________________?


aThermal insulation


bTransformers


cMagnetic switches


dTelevision sets


View Answer Thermal insulation

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