Coke oven gas yield is more
Tar yield is less but free carbon in tar is more
Calorific value of coke oven gas is less
All of the above
✅ The correct answer is option D.
Engineering
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3332. Semi-silica bricks compared to silica bricks have
less fusion point.
better spalling resistance.
both (a) and (b).
neither (a) not (b).
✅ The correct answer is option C.
3333. Chrome magnesite bricks are
acidic in nature.
neutral in nature.
having higher RUL than silica bricks.
made by mixing 30% chromite and 70% periclase.
✅ The correct answer is option C.
3334. Cermets are
composite material containing both ceramic & metallic constituents.
having high strength & resistance to high temperature.
used in space vehicles, missiles & nuclear energy plants.
all (a), (b) and (c).
✅ The correct answer is option D.
3335. ‘Super refractories’ are made from pure
carbides
oxides
borides
nitrides
✅ The correct answer is option B.
3336. Fusion temperature of pure silica (SiO2) is __________ °C.
1350
1715
2570
2800
✅ The correct answer is option B.
3337. Which is the stable form of silica below 870°C ?
Tridymite
Cristobalite
Quartz
None of these
✅ The correct answer is option C.
3338. Firing temperature is minimum (1250-1400 °C) for __________ bricks.
fireclay
direct bonded basic
silica
magnesite
✅ The correct answer is option A.
3339. 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.
3340. Which is not an alumino-silicate refractory?
Fireclay bricks.
Mullite bricks.
Tar dolomite bricks.
High alumina bricks.
✅ The correct answer is option C.