Graphite
Fireclay
Alumina
Zircon
✅ The correct answer is option A.
Chemical Engineering MCQs
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.
Refractoriness/fusion points of ‘superduty’ refractories is __________ °C.
1520-1630
1630-1670
> 1730
> 2000
✅ The correct answer is option C.
Which is not a basic refractory ?
Chrome magnesite
Magnesite
Dolomite
Silicon carbide
✅ The correct answer is option D.
Tar dolomite bricks are used in the
basic Bessemer converter
basic open hearth furnace
electric furnaces
all (a), (b) and (c)
✅ The correct answer is option D.
With decrease in porosity, the __________ of the refractories decreases.
strength
thermal conductivity
spalling resistance
none of these
✅ The correct answer is option C.
Out of the following fuels, the difference between the net and gross calorific value is maximum in case of
Pitch
Fuel oil
Blast furnace gas
Bituminous coal
✅ The correct answer is option B.
Water content in ground refractory material to be shaped into bricks by hand moulding is about __________ percent.
5
20
40
55
✅ The correct answer is option B.
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.
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.