Reg. No.
B.E. B.Tech. DEGREE EXAMINATION, MAY 2017
Fifth Semester
Mechanical Engineering 14UME502 ENGINEERING MATERIALS AND METALLURGY
(Regulation 2014)
Duration: Three hours Maximum: 100 Marks
Answer ALL Questions
PART A (10 x 1 10 Marks)
1. Increase of ferrite phase in steel increases
Strength Hardness Ductility Brittleness 2. Eutectic reaction for iron carbon system occurs at
6000 C 7230 C 11470 C 14930 C
3. Hardness of steel is greatly improved with
Annealing Cyaniding Normalising Tempering 4. Which one of the following mediums is used for fastest cooling rate of steel quenching
Air Oil Water Brin
5. The hardness number 1 on Moh's scale is assigned to
quartz talc topaz diamond
6. The impact strength of a material is an index of its
hardness Resilience to corrosion Toughness Resilience to failure under reversal of stresses
Question Paper Code: 41752
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7. The percentage of carbon in cast iron usually various between 0.1 to 0.2 0.5 to 1.0 1.0 to 1.5 2.5 to 3.5 8. Aero plane and certain automobile parts are usually made of Magnalium Aluminium bronze Duralumin German silver
9. Structure of a polymer is Long Chain Rhombic Cubic Closed pack hexagonal
10. Which one of the following materials is not a composite?
Wood Concrete Plywood Sialon
PART B x 2 10 Marks)
11. Explain GIBB's phase rule.
12. What is meant by case hardening?
13. Define yield strength.
14. List out effects of alloying additions on steel.
15. Differentiate thermoplastics and thermosetting plastics.
PART C x 16 80 Marks)
16. With suitable example, draw and explain the phase diagram for a binary alloy of two metals, which are completely soluble in liquid phase but only partly soluble in solid phase.
Or
Draw and explain various points in iron-carbide equilibrium diagram. List the compositions and typical applications of steels.
17. Compare and contrast the process of full annealing, process annealing, stress relief annealing, recrystallization annealing and spheroidizes annealing.
Or
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Define the term hardenability of steels. Explain Jominy end quench test used to determine hardenability of steels. How will you draw hardenability curves using this test?
18. What are slip and twinning? What are their characteristics.
Write a short note about different types of metallic fractures. Discuss the characteristics of ductile fracture and brittle fracture.
Or
Explain Creep with neat sketch.
What is Fatigue? Explain with neat sketch.
19. What are stainless steels? What are the main characteristics of stainless steels? Name different types of stainless steel and their main applications.
Or
Discuss the composition, properties and typical applications of any four copper alloys.
20. Discuss the properties and applications of ceramic materials in industries.
With schematic diagrams illustrate the processing of fiber reinforced composites.
Or
Explain the difference between commodity plastics and engineering plastics.
What do you understand by polymerization? With the help of suitable examples, compare addition and condensation polymerization.
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