3341. Lower part of hot metal mixer are lined with __________ bricks.
superduty fireclay
high alumina
silica
carborundum
✅ The correct answer is option D.
Chemical Engineering
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3342. 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.
3343. __________ bricks are used in the burning zone of a cement rotary kiln.
High alumina
Fireclay
Thoria
Silicon carbide
✅ The correct answer is option A.
3344. Si percentage in silica refractories used in the walls of coke oven is about
45
60
80
95
✅ The correct answer is option D.
3345. Carbon refractories have very high
wetting characteristics
refractoriness
thermal conductivity
both (b) and (c)
✅ The correct answer is option D.
3346. Cold crushing strength of refractories depends upon its
composition
texture
firing temperature
all (a), (b) and (c)
✅ The correct answer is option D.
3347. Bauxite calcining rotary kilns are lined with __________ bricks.
fireclay
carbon
85% alumina
corundum
✅ The correct answer is option C.
3348. Tar bonded dolomite bricks
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)
✅ The correct answer is option D.
3349. Natural silica
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).
✅ The correct answer is option D.
3350. Maximum safe working temperature for fireclay bricks is about __________ °C.
1150
1300
1450
1550
✅ The correct answer is option D.