8
24
44
58
✅ The correct answer is option B.
Engineering
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3202. Rate of slag attack on refractories increases with rise in temperature due to the
decreased viscosity of slag.
increased thermal conductivity of brick.
oxidising condition in the furnace.
none of these.
✅ The correct answer is option A.
3203. Insulating refractories should have
high porosity
low thermal conductivity
both (a) and (b)
neither (a) not (b)
✅ The correct answer is option B.
3204. Which property is important for bricks used in the combustion chamber & dome of blast furnace stoves ?
High refractoriness.
High resistance to spalling.
High strength and density.
All (a), (b) and (c).
✅ The correct answer is option A.
3205. Maximum shrinkage in volume occurring during burning/firing of dried refractories may be as high as __________ percent.
10
15
20
30
✅ The correct answer is option D.
3206. __________ bricks should not be used in oxidising atmosphere.
Tar dolomite
Carbon
Silica
Fireclay
✅ The correct answer is option B.
3207. Use of higher percentage of lime for bonding silica bricks, reduces their
strength
abrasion resistance
both (a) & (b)
neither (a) nor (b)
✅ The correct answer is option C.
3208. Mixing of ground refractory material and water is done in a __________ mill.
pug
ball
tube
rod
✅ The correct answer is option A.
3209. Zirconia refractory
does not react with basic slags.
is produced from baddeleyite.
can not be used as an insulator.
has poor electrical conductivity at high temperature.
✅ The correct answer is option B.
3210. Maximum water percentage in refractory mix meant for hand moulding may be as high as __________ percent.
2-Mar
5-Jul
7-Dec
14-20
✅ The correct answer is option D.