Chemical Engineering MCQs

Page No. 259

Which is not a high alumina refractory ?


aMullite

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bCorundum

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cBauxite

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dDolomite

✓


View Answer Dolomite

Spalling tendency of refractories is reduced by increasing its_________________?


aPorosity

✓


bSpecific gravity

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cThermal conductivity

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dStrength

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View Answer Porosity

Natural silica___________________?


aMainly contains quartz

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bIs not stable at high temperature

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cTransforms to other allotropic forms i.e. Tridymite and Cristobalite involving very high volume changes

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dAll A., B. and C.

✓


View Answer All A., B. and C.

. Refractoriness under load (RUL) of fireclay bricks (under a load of 2 kg/cm2) is ______________ °C?


a500

✖


b1000

✖


c>1350

✓


d>2000

✖


View Answer >1350

Carbon refractories_____________________?


aDo not burn/oxidise, when exposed to air on heating

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bAre not attacked by slags, as they are not wetted by melts

✓


cDo not resist temperature fluctuations

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dHave extremely low thermal & electrical conductivities

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Sillimanite is a _____________ refractory?


aBasic

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bNeutral

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cHigh alumina

✓


dInsulating

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View Answer High alumina

Which is required in an insulating refractory ?


aHigh thermal conductivity

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bLow porosity

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cBoth A. and B.

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dNeither A. nor B.

✓


View Answer Neither A. nor B.

Ganister is a source of the ________________?


aSilica

✓


bPericlase

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cLime

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dNone of these

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View Answer Silica

Refractoriness under load (RUL) is the most important property for the refractory bricks_________________?


aAt the hearth bottom of the furnace on which stock is placed

✓


bUsed for furnace insulation

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cUsed in the roof of the furnace

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dNone of these

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Which of the following bricks should not be used, if the furnace is to be used intermittently ?


aFirebricks

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bSilica bricks

✓


cSilicon carbide bricks

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dSillimanite

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View Answer Silica bricks

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