GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VI (New) EXAMINATION - WINTER 2019
--- Content provided by FirstRanker.com ---
Subject Code: 2162108
Date: 11/12/2019
Subject Name: Material Degradation and Prevention
Time: 02:30 PM TO 05:00 PM
Total Marks: 70
--- Content provided by FirstRanker.com ---
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
Q.1 (a) What are different reference electrodes? Define anode and cathode. 03
--- Content provided by FirstRanker.com ---
(b) What is polarization? Discuss in briefly. 04(c) What is pitting corrosion? Discuss its mechanism and prevention. 07
Q.2 (a) What are factors affecting corrosion? Discuss any one. 03
(b) What is passivity? Briefly explain. 04
(c) With suitable example discuss sacrificial anode and impressed current as method of cathodic protection. 07
--- Content provided by FirstRanker.com ---
OR(c) Discuss friction stir processing as method of surface composite manufacturing. 07
Q.3 (a) What are different ways of corrosion rate measurement? Explain in short. 03
(b) Discuss limitations of emf series. 04
(c) With reference to 18-8 Stainless steel, discuss intergranular corrosion and ways to combat it. 07
--- Content provided by FirstRanker.com ---
OR(c) Explain current density and its role in corrosion. 07
Q.4 (a) Discuss faraday’s law of electrolysis. 03
(b) Material Selection and design plays an important role in corrosion protection. Justify statement with suitable example. 04
(c) Differentiate between wet and dry corrosion. 07
--- Content provided by FirstRanker.com ---
Q.5 (a) Explain area and distance effect in galvanic corrosion. 03
(b) Discuss how inhibitors and passivators are used to combat corrosion. 04
(c) Briefly explain uniform corrosion. 07
OR
(a) Briefly discuss pin on disc method for wear measurement. 03
--- Content provided by FirstRanker.com ---
(b) Write brief note on sputtering and ion implanting. 04(c) Define wear and list analytical methods of wear. 07
Q.5 (a) Explain how galvanizing help to combat corrosion of steel. 03
(b) Discuss chemical vapor deposition (CVD) in detail. 04
(c) Explain Pilling Bedworth ratio 07
--- Content provided by FirstRanker.com ---
OR(a) Discuss prevention of high temperature corrosion. 03
(b) Discuss physical vapor deposition (PVD) in detail. 04
(c) dekdbbtdd kot 07
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
--- Content provided by FirstRanker.com ---