Chemical Engineering MCQs

Page No. 271

Refractory materials are never used in the construction of _________________?


aSegar cones

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bOrton cones

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cPressure vessels

✓


dOvens & retorts

✖


View Answer Pressure vessels

Chrome magnesite bricks are used in the_________________?


aSide walls of soaking pits and arc furnaces

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bCopper melting furnaces & converters

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cBurner block of glass tanks

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Roof of a basic open hearth furnace is lined with ______________ bricks?


aSilica

✓


bFireclay

✖


cDolomite

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dMagnesite

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View Answer Silica

Which of the following bricks has the most close values of RUL and PCE ?


aSilica bricks

✓


bFireclay bricks

✖


cHigh alumina bricks

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dTar dolomite bricks

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View Answer Silica bricks

Which is the most stable crystalline form of silica at room temperature ?


aQuartz

✓


bCristobalite

✖


cTridymite

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dNone of these

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View Answer Quartz

Because of its very high refractoriness of the order of __________ °C, silicon carbide refractories are used in zinc smelting furnace, muffle furnace and for supporting the wares in tunnel kilns ?


a1800

✖


b2200

✖


c2400

✖


d2700

✓


View Answer 2700

Carbon refractories are exclusively used in the_________________?


aHearth of blast furnace

✓


bWalls of coke oven

✖


cRegenerators of coke oven

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dSide wall of soaking pits

✖



Silicon carbide refractories have very low ___________________?


aRefractoriness (< 1700°C)

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bThermal conductivity

✖


cResistance to thermal shock

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dNone of these

✓


View Answer None of these

Refractory castables are used for__________________?


aProducing monolithic linings

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bPatch work

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cMinimising the number of joints in the structure

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Which of the following has the lowest electrical resistivity ?


aGraphite

✓


bFireclay

✖


cAlumina

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dZircon

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View Answer Graphite

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