1350
1715
2570
2800
✅ The correct answer is option B.
Chemical Engineering MCQs
Which is the stable form of silica below 870°C ?
Tridymite
Cristobalite
Quartz
None of these
✅ The correct answer is option C.
Firing temperature is minimum (1250-1400 °C) for __________ bricks.
fireclay
direct bonded basic
silica
magnesite
✅ The correct answer is option A.
Silica bricks are never used for lining the
beehive coke ovens.
by-product coke ovens.
dome of blast furnace stoves.
roof of open hearth furnace.
✅ The correct answer is option A.
Which is not an alumino-silicate refractory?
Fireclay bricks.
Mullite bricks.
Tar dolomite bricks.
High alumina bricks.
✅ The correct answer is option C.
Lower part of hot metal mixer are lined with __________ bricks.
superduty fireclay
high alumina
silica
carborundum
✅ The correct answer is option D.
Conversion of silica mineral to cristobalite is accompanied by reduction in its
volume
specific gravity
both (a) & (b)
neither (a) nor (b)
✅ The correct answer is option B.
__________ bricks are used in the burning zone of a cement rotary kiln.
High alumina
Fireclay
Thoria
Silicon carbide
✅ The correct answer is option A.
Si percentage in silica refractories used in the walls of coke oven is about
45
60
80
95
✅ The correct answer is option D.
Carbon refractories have very high
wetting characteristics
refractoriness
thermal conductivity
both (b) and (c)
✅ The correct answer is option D.