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Thermal spelling: The breaking or cracking or peeling off the refractory is known as spelling. A good refractory must show a good resistance to thermal spelling. Thermal spelling can be decreased by minimizing the development of internal stress by:
(1) Using refractory with high porosity, good thermal conductivity and low coefficient of expansion.
(2) Avoiding sudden temperature changes.
(3) Proper furnace design
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Q. Define flash and fire points and its determination. OR Write short note on: Flash and fire points. Ans. Flash and fire points:
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What is wrong with each of the following attempts to write an electron configuration? Justify your answer with suitable explanation. (a) 1s22s3 (b) 1s22s22p23s2 (c) 1s22s23s2 (d) 1
Properties of good refractory material: The requirements of refractories for different furnaces and heating places depend on the working conditions. Nature of slag formed, maximum
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Point defects: Point defects are defects which are not extended in space in any dimension. There is no strict limit for how small a "point" defect should be, but typically the ter
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