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Chemical Engineering - Refractory Technology

Exercise : Refractory Technology - Section 3
6.
In panel test for spalling resistance, the average face temperature of panel assembly is maintained at __________ °C for 24 hours.
700
1000
1600
2000
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Which is not an acidic refractory ?
Silica
Fireclay
High alumina refractory
Carbon black
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
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).
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
Thermal conductivity of refractory bricks
increases with decrease in porosity.
decreases with decreases in porosity.
is independent of its porosity and is maximum for insulating bricks.
increases with the amount of air entrapped in pores.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Dolomite bricks have good resistance to attack by
molten steel
iron oxide
lime slag
none of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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