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Chemical Engineering - Refractory Technology

Exercise : Refractory Technology - Section 3
11.
Most Cermets, which normally have high thermal conductivity and high thermal shock resistance, comprises of ceramic & metallic components of __________ percent respectively.
80 and 20
20 and 80
50 and 50
60 and 40
Answer: Option
Explanation:
No answer description is available. Let's discuss.
12.
Pick out the wrong statement.
Refractories used in muffle furnace should have low thermal conductivity.
The electrical resistivity of refractories drops rapidly with rise in temperature.
For reducing spalling tendency, the refractory should be well fired and its porosity should be more.
Refractoriness under load (RUL) of a refractory is always less than its refractoriness.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
13.
__________ bricks should not be used in oxidising atmosphere.
Tar dolomite
Carbon
Silica
Fireclay
Answer: Option
Explanation:
No answer description is available. Let's discuss.
14.
Pick out the wrong statement.
Insulating refractories used in place of regular refractory bricks are usually called light weight refractories, and they have similar composition as heavy bricks.
Graphite refractories are also called plumbago refractories.
Superduty fireclay bricks correspond to a pyrometric cone equivalent of 26-28.
Calcined magnesite is also called dead burnt magnesite.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
15.
Fusion temperature of pure silica (SiO2) is __________ °C.
1350
1715
2570
2800
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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