GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University
Subject Name: Surface Coating Technology
Time: 10:30 AM TO 01:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- VII (New) EXAMINATION — WINTER 2019
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Subject Code: 2172107 Date: 26/11/2019Subject Name: Surface Coating Technology
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| MARKS | ||
| Q.1 | ||
| (a) | State the requirements of the coating by giving examples of suitable application. | 03 |
| (b) | Describe the following methods: 1) Shot blasting and 2) Hydro-blasting. | 04 |
| (c) | Explain the scope and importance of surface engineering for different engineering materials. | 07 |
| Q.2 | ||
| (a) | Explain the importance of surface preparation. | 03 |
| (b) | Discuss the steps of chromating process with neat sketch. | 04 |
| (c) | Explain the process of phosphating on carbon steel. Discuss the mechanical and chemical properties developed on surface and its application in industries. | 07 |
| OR | ||
| (c) | Explain Anodizing as a method of corrosion prevention along with the essential process parameters. Discuss the role of oxide film in Aluminium anodizing. | 07 |
| Q.3 | ||
| (a) | State principle of Electro-less Plating along with the applications for the same. | 03 |
| (b) | Explain various factors affecting Electrodeposition. | 04 |
| (c) | Define Galvanizing. Draw a process layout of Hot dip Galvanizing of carbon steel sheets. | 07 |
| OR | ||
| Q.3 | ||
| (a) | Explain Sputtering using schematic. | 03 |
| (b) | Explain use of ion beam implantation in surface modification. | 04 |
| (c) | What is Physical Vapour Deposition (PVD)? Discuss evaporation method of PVD. | 07 |
| Q4 | ||
| (a) | Define pickling. State purpose of pickling and give name of pickling chemicals. | 03 |
| (b) | What is passivation? Why is it required for stainless steels? | 04 |
| (c) | What are surface metal matrix composites? Explain friction stir processing method to manufacture the same. | 07 |
| OR | ||
| Q4 | ||
| (a) | List examples of components made using thermal spray coatings. | 03 |
| (b) | Discuss the advantages of thermal spray coatings over metal matrix composites. | 04 |
| (c) | Discuss about different spray guns that can be used in thermal spray coating. Explain effect of spray gun on coating structure and properties. | 07 |
| Q.5 | ||
| (a) | Suggest type of surface treatment needed for removing Tarnishing on Silver ornaments. | 03 |
| (b) | Critically compare Pack Carburizing and Liquid Carburizing. | 04 |
| (c) | Describe carbonitriding process in detail. List the components that are subjected to the same. | 07 |
| OR | ||
| Q.5 | ||
| (a) | Discuss Plasma Spray Coating process with neat schematic. | 03 |
| (b) | Compare the Chromizing and Aluminizing diffusion coating methods. | 04 |
| (c) | Discuss a case study for surface coating/modification for designing gear assembly (made of low alloy steel with 0.15% C, 1% Cr, 0.5% Si and 1% Mn) in the car. Suggest a technique, explain and justify the same. | 07 |
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