Chemical Engineering MCQs

Page No. 265

High thermal conductivity of a refractory material is not important, when it is to be used in the______________________?


aCoke oven regenerators

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bMuffle furnace

✖


cBlast furnace

✓


dRecuperators

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View Answer Blast furnace

Magnesite bricks are used in those parts of furnaces, which are __________________?


aSubjected to temperature fluctuation

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bRequired to resist corrosive basic slag

✓


cSubjected to high load

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dNone of these

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Fireclay bricks are never used in the______________?


aBeehive oven

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bCoke oven walls

✓


cZinc roaster

✖


dLead blast furnace

✖


View Answer Coke oven walls

Resistance to slag attack of a refractory _____________________?


aDepends on the nature of slag & refractory

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bDecreases at higher temperature

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cDecreases, if defective joints & cracks exist in the refractory

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Which is not an alumino-silicate refractory ?


aFireclay bricks

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bMullite bricks

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cTar dolomite bricks

✓


dHigh alumina bricks

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View Answer Tar dolomite bricks

An indication of degree of firing in silica brick is its____________________?


aSpecific gravity

✓


bFusion point

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cRUL

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dNone of these

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View Answer Specific gravity

Which refractory must have controlled atmosphere (temperature and humidity) for its safe storage ?


aTar bonded dolomite bricks

✓


bFireclay bricks

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cMullite bricks

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dMagnesite bricks

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Refractories are dried in the _______________?


aRotary kilns

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bTunnel kilns

✓


cSun

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dNone of these

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View Answer Tunnel kilns

Electrical resistor bars are made of _______________?


aSilicon carbide

✓


bAlumina

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cZirconia

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dGraphite

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View Answer Silicon carbide

Firing temperature is minimum (1250-1400 °C) for _______________ bricks?


aFireclay

✓


bDirect bonded basic

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cSilica

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dMagnesite

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View Answer Fireclay

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