Download GTU BE/B.Tech 2019 Winter 6th Sem New 2162108 Material Degradation And Prevention Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 6th Sem New 2162108 Material Degradation And Prevention Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VI (New) EXAMINATION ? WINTER 2019
Subject Code: 2162108 Date: 11/12/2019

Subject Name: Material Degradation and Prevention

Time: 02:30 PM TO 05:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

Q.1* (a) What are different reference electrodes? Define anode and cathode. 03
(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
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
OR
Q.3 (a) Explain current density and its role in corrosion. 03
(b) Discuss faraday?s law of electrolysis. 04
(c) Material Selection and design plays an important role in corrosion protection.
Justify statement with suitable example.
07
Q.4 (a) Differentiate between wet and dry corrosion. 03
(b) Explain area and distance effect in galvanic corrosion. 04
(c) Discuss how inhibitors and passivators are used to combat corrosion. 07
OR
Q.4 (a) Briefly explain uniform corrosion. 03
(b) Briefly discuss pin on disc method for wear measurement. 04
(c) Write brief note on sputtering and ion implanting. 07
Q.5 (a) Define wear and list analytical methods of wear. 03
(b) Explain how galvanizing help to combat corrosion of steel. 04
(c) Discuss chemical vapor deposition (CVD) in detail. 07
OR

Q.5 (a) Explain Pilling Bedworth ratio 03
(b) Discuss prevention of high temperature corrosion. 04
(c) Discuss physical vapor deposition (PVD) in detail. 07

***********


FirstRanker.com - FirstRanker's Choice