Chemical Engineering MCQs

Page No. 266

Which of the following is not a neutral refractory ?


aSilicon carbide

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bMagnesite

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cChromite

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dGraphite

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View Answer Magnesite

Which is the stable form of silica below 870°C ?


aTridymite

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bCristobalite

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cQuartz

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dNone of these

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View Answer Quartz

Insulating refractories should have_______________?


aHigh porosity

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bLow thermal conductivity

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cBoth A. and B.

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dNeither A. not B.

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With increase in the alumina content in firebricks, its fusion point (refractoriness) ?


aDecreases linearly

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bRemains unchanged

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cIncreases

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dDecreases

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View Answer Increases

Refractoriness of a typical silica brick corresponds to Segar cone number, ’32’, which is equivalent to a temperature of _____________ °C?


a1380

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b1520

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c1710

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d1915

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View Answer 1710

Except _____________, all other refractories are bad conductors of electricity (i.e, have low electrical conductivity)?


aFireclay

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bCarborundum

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cGraphite

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dChromite

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View Answer Graphite

Grog__________________?


aContains both alumina and silica

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bIs crushed firebrick

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cIs a non-plastic material

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dAll A., B. and C.

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View Answer All A., B. and C.

Which of the following is not an acidic refractory?


aSilica bricks

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bFireclay bricks

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cBauxite bricks

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dMagnesia bricks

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View Answer Magnesia bricks

Firing temperature of magnesite bricks is about _____________ °C?


a800-1000

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b1000-1200

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c1600-1800

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d2400-2600

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View Answer 1600-1800

Silicon carbide refractories are used in the _____________?


aMuffle furnace

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bZinc smelting furnace

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cCeramic recuperators

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dAll A., B. and C.

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View Answer All A., B. and C.

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