Unformatted text preview: NATIONAL INSTITUTE OF TECHNOLOGY ROURKELA
B.Tech. Autumn Mid-Semester Examination, 2010 Session: 2012—13 B.Tech. 3rd Semester
% (g Sub: Properties of Ceramic Raw Materials (CR-23 1)
! 5, Full Marks: 60 Duration of Examination: 2.00 hrs
Answer all questions. All parts of a question should be answered at one place.
Figures at the right hand margin indicate marks.
Q. No. Marks . Explain: Why?
(a) Clays are all ﬂaky type materials. (b) Montmorillonite clay swells in water. (c) Illite group of clays are non-expanding in nature.
((1) Nepheline syenite is a better flux than albite. (e) Talc is softest mineral. Show the proper sequences and temperatures of displacive and
‘ reconstructive phase transformations in silica polymorphs. Explain
why? Residual quartz in silica refractory is undesirable.
Differentiate among; (a) orthosilicate, pyrosilicate and metasilicate
structures giving examples and (b) Orthoclase and Albite 3. Describe the action of heat upon: (a) Dolomite (b) Kaolinite (c)
Talc (f) Kyanite and (g) Pyrophillite. . Draw the schematic structure of (a) Kaolinite (b) Anorthite (c)
Pyrophillite (d) Wollastonite and (e) Microline. . State the classiﬁcation of clay minerals based on structure.
Describe ,the formation of Kaolinite from Feldspar through
weathering action. Describe the type of bonding which occurs
between two unit layers along stacking direction of koalinite,
montmorillonite and muscovite type of minerals. (a) Give .uses of Quartzite, Calcite and Wollastonine. (b) What is
synthetic mica? (0) State three different uses of wollastonite (d)
What is “Dead Burning” of Magnesite? Name of question paper setter: Dr. J. Bera (CR) ...
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