combustion chamber of blast furnace stoves.
electric furnaces.
highly chemical resistant equipments.
blast furnace hearth.
✅ The correct answer is option A.
Refractory Technology MCQs
Upper portion of hot metal mixer are lined with mullite bricks, which helps in resisting the
washing action of metal.
corrosion by layer of slag.
both (a) & (b).
neither (a) nor (b).
✅ The correct answer is option A.
Presence of MgO in alumino-silicate refractories __________ its refractoriness.
increases
lowers
does not affect
either (a) or (b); depends on its quantity
✅ The correct answer is option B.
Pyrometric cone equivalent (PCE) value (Segar cone) of ‘superduty refractories’ is more than 33 which corresponds to a temperature of __________ °C.
1520
1630
1670
1730
✅ The correct answer is option D.
Firing temperature of magnesite bricks is about __________ °C.
800-1000
1000-1200
1600-1800
2400-2600
✅ The correct answer is option C.
Fusion point of a basic refractory material is
reduced by the addition of acid oxides.
increased by the addition of acid oxides.
not affected by the addition of acid oxides.
always less than 1000°C.
✅ The correct answer is option A.
Si percentage in silica refractories used in the walls of coke oven is about
45
60
80
95
✅ The correct answer is option D.
Cold crushing strength of refractories depends upon its
composition
texture
firing temperature
all (a), (b) and (c)
✅ The correct answer is option D.
Natural silica
mainly contains quartz.
is not stable at high temperature.
transforms to other allotropic forms i.e tridymite and cristoballite involving very high volume changes.
all (a), (b) and (c).
✅ The correct answer is option D.
Maximum safe working temperature for fireclay bricks is about __________ °C.
1150
1300
1450
1550
✅ The correct answer is option D.