Download GTU B.Tech 2020 Winter 7th Sem 2173604 Whitewares I Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION - WINTER 2020

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Subject Code:2173604 Date:19/01/2021
Subject Name:Whitewares-I
Time:10:30 AM TO 12:30 PM Total Marks: 56

Instructions:

1. Attempt any FOUR questions out of EIGHT questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

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MARKS

Q.1 (a) Describe effect of heating on tri axial whitewares body. (03)
(b) Explain the difference between Reaction bonded and hot pressed silicon nitride (04)

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(c) Describe in brief role of clay, quartz and feldspar in Tri axial body (07)

Q.2 (a) Explain extrusion (03)
(b) Differ between slip casting and jiggering (04)
(c) Explain the Tape casting process in detail. (07)

Q.3 (a) Describe synthesis of Sea water magnesia (03)

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(b) Explain the phase diagram of Al₂O₃-SiO₂ (04)
(c) Describe the transformation toughening process of partially toughened zirconia. (07)

Q.4 (a) Define normal and inverse spinel. (03)
(b) Describe the occurrences of chrome ore. (04)
(c) Describe the structure of chrome ore in detail. (07)

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Q.5 (a) What is natural magnesia? (03)
(b) Define different types of magnesia. (04)
(c) Describe occurrences of magnesia (07)

Q.6 (a) Define flux materials. (03)
(b) Write down the role of flux in composition. (04)

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(c) Write down the role of wollastonite, nepheline syenite and feldspar as flux. (07)

Q.7 (a) Explain polymorphic transformation of zirconia. (03)
(b) Differ between fully and partially stabilized zirconia. (04)
(c) Explain the role of silica, soda ash and alumina in soda lime silica glass (07)

Q.8 (a) What is meant by creep? (03)

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(b) Explain enthalpy vs. temperature diagram of a glass forming melt. (04)
(c) What are raw materials normally used in whiteware body making? Explain the parameters for raw material selection (07)

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