5-Oct
Oct-25
25-35
35-50
✅ The correct answer is option B.
Engineering
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3352. Fireclay bricks are not used in the
beehive coke oven.
by-product coke oven walls.
combustion chamber of B.F. stoves.
coke oven regenerators.
✅ The correct answer is option B.
3353. Ceramic recuperators used for waste heat recovery from high temperature flue gas going out of the furnace is made of
fireclay
silicon carbide
corrundum
siliceous fireclay
✅ The correct answer is option B.
3354. Highest melting (m.p = 3070°C) oxide refractory is
alumina
thoria
zirconia
magnesia
✅ The correct answer is option B.
3355. Firing of refractory brick is done to
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).
✅ The correct answer is option D.
3356. Which of the following impurities reduces the refractoriness of magnesite bricks ?
Al2O3
CaO
SiO2
all (a), (b) & (c)
✅ The correct answer is option D.
3357. Which of the following is not an acidic refractory ?
Silica bricks
Fireclay bricks
Bauxite bricks
Magnesia bricks
✅ The correct answer is option D.
3358. Which is the stable form of silica between 1470°C and the melting point 1713°C ?
Cristobalite
Tridymite
Quartz
None of these
✅ The correct answer is option A.
3359. Ferromagnetic ceramic material is not used in the
thermal insulation
transformers
magnetic switches
television sets
✅ The correct answer is option A.
3360. Which brick undergoes maximum shrinkage on drying ?
Tar bonded dolomite bricks
Fireclay bricks
Magnesite bricks
Chromite bricks
✅ The correct answer is option B.