3261. Which of the following consumes the maximum tonnage of refractories annually in an integrated steel plant ?
Soaking pits
Ceheating furnace
L.D. converter
Rotary lime kiln
✅ The correct answer is option C.
Chemical Engineering
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3262. Which of the following petrological constitutes is responsible for bright and lustrous black band of bituminous coal?
Vitrain
Clarain
Durain
Fussain
✅ The correct answer is option A.
3263. A good metallurgical coke
Should have high porosity
Should be brittle
Must contain moderate quantities of ash, moisture, sulphur and volatile matters
Should have low fusion point of its ash
✅ The correct answer is option A.
3264. Periclase is
crystalline form of MgO.
MgCO3.
ZrSO4.
amorphous magnesite.
✅ The correct answer is option A.
3265. Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an __________ bed gasifier.
Entrained
Moving
Fixed
Fluidised
✅ The correct answer is option A.
3266. The average molecular weight of a flue gas having the composition by volume as CO₂ = 25%, O₂ = 25%, N₂ = 50% will be
27.6
23
47.3
42.9
✅ The correct answer is option B.
3267. Which furnace consumes maximum refractory annually in an integrated steel plant ?
Soaking pit
Blastfurnace
L.D. converter
Coke ovens
✅ The correct answer is option C.
3268. Chromite refractories
are bonded with lime and clay.
(free from silica) have better thermal fatigue resistance than silica and magnesite refractories.
are resistant to basic slag.
all (a), (b) and (c).
✅ The correct answer is option D.
3269. Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ °C.
770
570
270
70
✅ The correct answer is option C.
3270. Resistance to slag attack of a refractory
depends on the nature of slag & refractory.
decreases at higher temperature.
decreases, if defective joints & cracks exist in the refractory.
all (a), (b) and (c).
✅ The correct answer is option D.