Chemical Engineering MCQs

composition

texture

firing temperature

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

fireclay

carbon

85% alumina

corundum

are stored under controlled temperature & humidity to avoid hydration.

are used in outer lining of L.D. converters.

have poorer hydration resistance than pitch bonded bricks.

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

mainly contains quartz.

is not stable at high temperature.

transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.

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

1150

1300

1450

1550

5-Oct

Oct-25

25-35

35-50

beehive coke oven.

by-product coke oven walls.

combustion chamber of B.F. stoves.

coke oven regenerators.

fireclay

silicon carbide

corrundum

siliceous fireclay

alumina

thoria

zirconia

magnesia

dehydrate the dried refractory.

develop stable mineral forms in them.

form ceramic bonds necessary for development of high crushing strength in the finished product.

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