Chemical Engineering MCQs

Page No. 268

_____________ is not a single oxide-refractory?


aZirconia

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bSilicon carbide

✓


cMagnesia

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dNone of these

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View Answer Silicon carbide

High alumina refractories are used in the ___________________?


aDome of blast furnace stoves

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bElectric arc furnace roof

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cGlass melting furnaces

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Thermal spalling mainly occurs during _____________ of furnaces?


aCooling down

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bWarming up

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

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


aQuartz

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bCristobalite

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cTridymite

✓


dNone of these

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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

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bNuclear reactors, missiles & space crafts

✓


cInsulation of high temperature furnaces

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dRoof of electric furnaces

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Zircon refractories have__________________?


aLow co-efficient of expansion

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

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cHigh spalling resistance

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dAll A., B. and C.

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View Answer All A., B. and C.

Chromite refractories_____________________?


aAre bonded with lime and clay

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

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cAre resistant to basic slag

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dAll A., B. and C.

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View Answer All A., B. and C.

_____________ nozzles are used in continuous casting of steel?


aZircon

✓


bThoria

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cCarborundum

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dBeryllia

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View Answer Zircon

Which one expands on heating ?


aSilica bricks

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bFireclay bricks

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Silica bricks

Ferromagnetic ceramic material is not used in the__________________?


aThermal insulation

✓


bTransformers

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cMagnetic switches

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dTelevision sets

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View Answer Thermal insulation

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