Download GTU B.Tech 2020 Winter 7th Sem 2173614 Refractories Ii Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2173614 Refractories Ii Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2173614 Date:21/01/2021
Subject Name:Refractories-II
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) Differ between R.U.L. and Creep.
03

(b) Explain the oxidation process in LD converter during liquid steel making.
04

(c) Discuss the polymorphic transformation of silica. What is meant by
07
refractoriness under load of a material? Explain


Q.2 (a) Write a short note on talc
03

(b) Differ between biotite mica and muscovite mica
04

(c) Explain the phase diagram of Fe-Fe3C.
07




Q.3 (a) Explain the difference between nucleation and growth.
03

(b) Write the difference between Spodumene and Lepidolite.
04

(c) Explain the model of nucleation with mathematical derivation
07




Q.4 (a) What is bursting of magchrome bricks?
03

(b) What is recrystallization and abnormal grain growth?
04

(c) Write down the processing of synthesis of mag carbon bricks.
07
Q.5 (a) Describe the occurrences of chrome ore.
03

(b) Define normal and inverse spinel.
04

(c) Define steel. Explain different types of steel.
07



Q.6 (a) Why gamma alumina is called pseudo spinel?
03

(b) Discuss various types of alumina.
04

(c) Describe synthesis of alumina by Bayer's process.
07
Q.7 (a) What is sea water magnesia?
03

(b) Write various applications of alumina.
04

(c) Explain the role of silica, soda ash and alumina in soda lime silica glass.
07

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Q.8 (a) Define aluminosilicates with examples.
03
(b) Describe occurrences of alumina.
04
(c) What are raw materials normally used in glass making? Explain the
07
parameters for raw material selection.

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