3361. Carborundum used for making crucibles for melting non-ferrous metals is chemically
silicon carbide
silicon nitride
crystalline magnesia
zirconium sulphate
✅ The correct answer is option A.
Chemical Engineering
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3362. Maximum alumina content in high alumina refractory can be as high as __________ percent.
30
50
70
90
✅ The correct answer is option D.
3363. Carbon refractory blocks
are wetted by molten iron.
are used in the hearth of blast furnace.
are acidic in nature.
all (a), (b) and (c).
✅ The correct answer is option B.
3364. Pure bauxite is the best raw material for the manufacture of high alumina refractories, in which maximum alumina content can be as high as __________ percent.
55
70
80
90
✅ The correct answer is option D.
3365. A steel member used in the furnace construction to take the thrust of the brickwork is called
buckstay
breast wall
armouring
baffle
✅ The correct answer is option A.
3366. Which of the following has the lowest electrical resistivity ?
Graphite
Fireclay
Alumina
Zircon
✅ The correct answer is option A.
3367. Graphite or carbon refractories
exihibit wetting characteristics.
should be used in neutral or reducing atmosphere.
exhibit high shrinkage on thermal treatment.
are not resistant to corrosion by slag.
✅ The correct answer is option B.
3368. Refractoriness/fusion points of ‘superduty’ refractories is __________ °C.
1520-1630
1630-1670
> 1730
> 2000
✅ The correct answer is option C.
3369. Which is not a basic refractory ?
Chrome magnesite
Magnesite
Dolomite
Silicon carbide
✅ The correct answer is option D.
3370. Pure carbon is completely burnt in oxygen. The flue gas analysis is 70%CO₂, 20%CO and 10%O₂. The percent excess oxygen used is
20
12.5
0
10
✅ The correct answer is option C.