College : Vardhaman College Of Engineering
Degree : B.Tech
Department : Mechanical Engineering
Semester : III
Subject : Metallurgy & Material Science
Document type : Question Paper
Website : vardhaman.org
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Vardhaman Metallurgy & Material Science Question Paper
B. Tech III Semester Regular Examinations, December – 2013
(Regulations : VCE-R11)
(Mechanical Engineering)
Date : 13 December, 2013
Time : 3 Hours
Max. Marks : 75
Related : Vardhaman College Of Engineering Probability Theory & Stochastic Processes B.Tech Question Paper : www.pdfquestion.in/6326.html
Answer ONE question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
Unit – 1 :
1. a) Explain the term unit cell. List all the Bravais lattices in decreasing order of symmetry.7M
b) Give a test method for determining grain size of metals. Write the Hall-Petch relation and sketch a typical plot of yield strength Vs grain size. 8M
2. a) Enumerate on the need for alloying. State Hume Rothery rules for substitutional solid solution. 7M
b) What is solid solution? Discuss various types of solid solution. 8M
Unit – 2 :
3. a) A binary phase diagram is expected to be of isomorphous type. Describe all the steps to construct the phase diagram. Label all areas, lines and points in the phase diagram. 7M
b) Explain the following with an example for each:
i. Eutectic reaction
ii. Peritectic reaction
iii. Eutectoid reaction
iv. Peritectoid reaction 8M
4. a) Draw Iron-Carbon equilibrium diagram and list all the phase reactions. 7M
b) Lead melts at 3240C and tin melts at 2800C. They form a eutectic containing 62% tin at 1800C. The maximum solubility of tin in lead at this temperature is 19% of lead in tin is 3%. Assuming the solubility of each at room temperature is 1%. Draw the equilibrium diagram labeling all lines, points and areas. For an alloy containing 40% tin, give the initial temperature of solidification, final temperature of solidification and percentage of eutectic phase present at room temperature. 8M
Unit – 3 :
5. a) Explain the effect of alloying elements on Fe-Fe3C system. 6M
b) Compare gray cast iron and SG cast iron with respect to composition, structure, properties and uses. 9M
6. a) With a neat sketch explain Time – Temperature – Transformation diagram for steel with eutectoid composition. Explain the term critical cooling rate. 7M
b) Enumerate on surface hardening methods highlighting the process principle, process parameters and merits of each of the process. 8M
Unit – 4 :
7. a) Enumerate on different types of Titanium alloys – highlight the general characteristics and applications. 7M
b) Describe the composition, properties and applications of the following
i. Berylium bronzes
ii. Phosphor bronzes 8M
8. a) Explain why ceramics are typically processed as powders. How this is similar to or different from the processing of metals. 8M
b) Write a short note on Refractories. List out the various industrial applications of the refractory materials. 7M
Unit – 5 :
9. a) Define a composite material and give an example each for natural and synthetic composite material. 7M
b) Explain Hand lay-up method for making Glass Fiber Reinforced Plastic. Highlight the process steps and applications.8M
10. a) Enumerate on Metal Matrix composites highlighting methods of manufacturing and applications. 7M
b) Enumerate on C – C composite plastic – the general characteristics and applications. 8M
Four Year B. Tech III Semester Regular Examinations – 2013 :
Regulations: VCE-R11
Metallurgy & Material Science :
(Mechanical Engineering)
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
Unit – 1 :
1. a) Define the following terms
i. Unit cell
ii. Atomic packing factor
iii. Co-ordination number 6M
b) Determine the atomic packing factor for a BCC unit cell. 5M
c) Sketch the following crystal imperfections
i. Vacancy
ii. Interstitialcy 4M
2. a) What is a phase diagram? List the three types of phase diagrams. With a neat sketch illustrate a binary phase diagram. 10M
b) Write a brief note on lever rule. 5M
Unit – 2 :
3. a) Draw neatly iron carbon-carbon equilibrium diagram and mention the three variant reactions involved in the phase diagram. 10M
b) With the help of Isomorphous system phase diagram explain the lever rule. 5M
4. a) Write a short note on allotropy. 5M
b) Two metals A and B have their melting points at 9000C and 8000C respectively. The alloy pair forms a eutectic at 6000C of composition of 60% B and 40% A. A and B have unlimited mutual liquid solubilities.
Their solid solubilities are as follows:
10% B in A at 6000C and 5% B in A at 00C
10% A in B at 6000C and 5% A in B at 00C
Assume the liquids, solidus and solvus lines to be straight. No solid state reactions or any intermediate phase changes occur in the series.
i. Draw the phase diagram for the series and label all salient temperature, compositions and regions.
ii. Find the liquid and solid phase percentages in an alloy of 80% A and 20% B at 6500C. 10M
Unit – 3 :
5. a) What is the classification of steels? Explain the effect of alloying element on the steels. 7M
b) What are the engineering applications of grey cast iron? And also explain he composition, microstructure and properties of grey cast iron. 8M
6. a) What is T-T-T diagram? How it is different from phase diagram? Explain. 6M
b) Write short notes on the following with their objectives.
i. Normalizing
ii. Tempering
iii. Hardening 9M
Unit – 4 :
7. a) Mention the need for using non ferrous alloys. Write a brief note on copper and copper alloys. 8M
b) Write explanatory notes on any two aluminum alloys. 7M
8. a) Define ceramics. Briefly mention the properties which make the material to be used in engineering applications. 8M
b) Define the properties, characteristics and applications of glass material. 7M
Unit – 5 :
9. a) Define a composite material. How are they classified? Explain. 8M
b) Briefly discuss the applications of composite materials. 7M
10. a) Sketch an explain hand layup method for processing FRP’s. 8M
b) With a neat sketch explain he stir casting route of processing MMC’s. 7M