JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV CERAMICS SCIENCE AND TECHNOLOGY Previous Question Paper (January/February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B.
ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions.
iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
PART-A
Which combination of bonding types are involved in most ceramics?
Answer
Most ceramics are characterized by a combination of ionic and covalent bonding.
Draw the structure of CsCl crystal.
Answer
The CsCl structure consists of two interpenetrating simple cubic lattices. The Cs+ ion is located at the center of a cube formed by eight Cl- ions at the corners, resulting in a coordination number of 8:8.
Write the chemical formula for compound “Spinel”.
Answer
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How co-ordination number can be calculated for ceramic materials.
Answer
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Mention the relation between Modulus of elasticity and porosity for ceramic materials.
Answer
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What type of plastic deformation is involved for non-crystalline ceramic materials?
Answer
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Write about thermally tempered glass.
Answer
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Mention the different types of powder production techniques based on mechanical, physical and chemical methods.
Answer
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Write about Gel casting.
Answer
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Write about cementation process.
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PART-B
Explain the different types of crystal structures of AX compounds with neat sketches.
Answer
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Define cermets. What are their properties?
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How the cermets are manufactured? Give examples.
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Draw a neat sketch of MgO –Al2O3-SiO2 ceramic phase diagram and label all the points, lines and areas.
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Define the terms stoichometric ratio and phase boundary.
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Construct BaO-TiO2 ceramic phase diagram and label all the points, lines and areas.
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Explain the behavior of stress- strain curve for ceramic materials.
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With the help of neat diagram describe the plastic deformation of Rock salt crystal structure.
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What is piezoelectric effect? Explain. List out various types of natural and synthetic Piezo-electric crystals.
Answer
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Define the term ‘Sol’. Explain in detail the Sol-gel technique.
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Compare and contrast between co-precipitation and precipitation methods.
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Explain the following:
Thermal decomposition of Th(C2O4)2 for the preparation of ThO2 powders.
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Preparation of Al2O3 powders.
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Describe the different stages in Hot Iso-static pressing (HIP) for producing ceramic products. What are its merits and demerits?
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With neat diagrams describe the following processes:
Slip casting
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Extrusion.
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