Refractory Technology MCQs

High thermal conductivity

Low porosity

Both (a) and (b)

Neither (a) nor (b)

furnaces allowed to cool frequently

flues

chimney linings

all (a), (b) and (c)

are not resistant to the action of basic slags.

combine with salts (e.g. chlorides sulphates etc.) & bases (e.g. lime, magnesia etc.) forming fusible aluminates silicates etc.

shrink during firing

all (a), (b) and (c)

silica

fireclay

magnesite

zirconia

basic Bessemer converter

basic open hearth furnace

electric furnaces

all (a), (b) and (c)

crystalline form of MgO.

MgCO3.

ZrSO4.

amorphous magnesite.

Soaking pit

Blastfurnace

L.D. converter

Coke ovens

Firebrick

Sillimanite

Magnesite

Aluminous firebrick

beehive oven

coke oven walls

zinc roaster

lead blast furnace

poor resistance to the peneration of molten slag, metal & flue gases.

poor heat conductivity & low strength.

better thermal spalling resistance.

all (a), (b) and (c).