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SRI SHANMUGHA COLLEGE OF ENGINEERING AND TECHNOLOGY

Pullipalayam, Morur (Po), Sankari (Tk), Salem (Dt).DEPARTMENT OF MECHANICAL ENGINEERING

MODEL EXAM I

(For CategoryI Students)

Sem/Year: IV/II Date:06.05.2013

Subject : Engineering Materials and Metallurgy Time: 1.30 p.m to 4.30 p.m

Max Marks: 100

PART-A (Answer all) 10x2=20

1. What are the effects of carbon on the properties of cast iron?2. What are the primary effects of adding Ni, Si, Mo in cast irons?3. What are gun metals? Give its composition.4. What is meant by precipitation hardening?5. List the bearing materials that are commonly used?6. What is duralumin? Give its composition and applications.7. What is polymerization? Define the term degree of polymerization.8. Why are additives, fillers and plasticizers added to polymers?9. What are sialons? State their applications.10.What are cermets? What are two common uses of cermets?

PART-B (Answer all) 5x16=8011.(A) Explain the following steels: (a) Tool steels (b) HSLA steels and (c) Maraging steels.

OR11. (B) Compare grey and malleable cast irons with respect to (i) composition and heat treatment

(ii) microstructure and (iii) mechanical characteristics.


Pullipalayam, Morur (Po), Sankari (Tk), Salem (Dt).

DEPARTMENT OF MECHANICAL ENGINEERING

MODEL EXAM I



Subject : Engineering Materials and Metallurgy Time: 2 p.m to 5 p.m

Max Marks: 100


1. What are the effects of carbon on the properties of cast iron?2. What are the primary effects of adding Ni, Si, Mo in cast irons?3. What are gun metals? Give its composition.4. What is meant by precipitation hardening?

5. List the bearing materials that are commonly used?6. What is duralumin? Give its composition and applications.7. What is polymerization? Define the term degree of polymerization.8. Why are additives, fillers and plasticizers added to polymers?9. What are sialons? State their applications.10.What are cermets? What are two common uses of cermets?

PART-B (Answer all) 5x16=80

11.(A) Explain the following steels: (a) Tool steels (b) HSLA steels and (c) Maraging steels.OR

11. (B) Compare grey and malleable cast irons with respect to (i) composition and heat treatment

(ii) microstructure and (iii) mechanical characteristics.

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12.(A) Explain the different types of stainless steel and give the typical application of each ofthem.

OR12. (B) Discuss the composition, properties, and typical applications of any four copper alloys.

13. (A) Explain the following: (a) polyethylene (b) polyvinyl chloride (c) acetal and (d)polymides.

OR

13. (B) List the properties and typical applications of the following thermoplastics.(i) PTFE (ii) PMMA (iii) PET (iv) PEEK

14. (A) (a) Describe the difference between thermoplastics and thermosetting plastics.(b) Explain the difference between commodity plastics and engineering plastics.

OR14. (B) With the help of suitable examples, compare and contrast the process of addition

polymerization and condensation polymerization.

15. (A) What are the main classifications of ceramic materials? Explain five important propertiesof ceramics that make them useful engineering materials.

OR15. (B) Explain the strengthening mechanism of fibre-reinforced composites. List the advantages,

limitations and applications of composite materials.




OR

13. (B) List the properties and typical applications of the following thermoplastics.(ii) PTFE (ii) PMMA (iii) PET (iv) PEEK

14. (A) (a) Describe the difference between thermoplastics and thermosetting plastics.(c) Explain the difference between commodity plastics and engineering plastics.






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MODEL EXAM II


Sem/Year: IV/II Date:30.04.2013Subject : Engineering Materials and Metallurgy Time: 2 p.m to 5 p.m

Max Marks: 100


1. Differentiate between ductility and malleability.

2. What do you mean by toughness and stiffness?3. Define the term slip and twinning.4. State the Schmids law.5. What is meant by fatigue fracture and creep fracture?6. Differentiate between destructive and non destructive tests.7. Define the term notch sensitivity.8. What is the difference between Izod and Charpy impact testing methods?9. What are alloy steels? How are alloy steels classified?10.List four important alloying elements added in alloy steels. What makes a stainless steel

stainless?


11.(A) What is the effect of the following on the mechanical properties of the materials:(a) Grain size (b) Heat treatment (c) Atmospheric exposure (d) Temperature

OR

11.(B) What is brittle fracture? Explain the Griffiths theory on brittle fracture and deduce anexpression for the critical stress required to propagate a crack simultaneously in a brittlematerial.



MODEL EXAM II



Subject : Engineering Materials and Metallurgy Time: 2 p.m to 5 p.m

Max Marks: 100


1. Differentiate between substitutional and interstitial solid solutions.

2. State Gibbsphase rule?3. What is an equilibrium phase diagram?4. Differentiate between eutectic and eutectoid reactions.5. Define: ferrite, cementite, austenite, pearlite, martensite, bainite.6. What are the purposes of the processing heat treatments?7. What is meant by annealing and normalizing?8. Distinguish the work hardening with the age hardening process.9. What is Martempering and austempering?10.Define the term critical cooling rate. What are the factors affecting it?


11.(A) What are cooling curves? How does the time temperature cooling curve of an alloy ofeutectic composition differ from that of a pure metal?

OR

11.(B) How will you plot binary phase diagram for two metals which are completely soluble inliquid and solid states?

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12.(A) What is meant by ductile fracture? Explain the mechanism of it.OR

12. (B) Explain the mechanism of fatigue fracture and creep fracture. How can you prevent it?

13. (A) Describe a Brinell hardness test to determine the hardness of a metal.

OR13. (B) Describe the procedure for performing the Rockwell test.

14. (A) What are the main reasons for using notch impact tests? Write an engineering brief aboutcreep test.

OR14. (B) Explain the working principle of rotating beam fatigue tests.

15. (A) (a) Give the classifications of steels.(b) Describe the properties and typical applications of low-medium, and high-carbon steels.

OR15. (B) (a) What are the main classifications of stainless steels?

(b) Discuss the different types of stainless steel, making reference to approximatecompositions, structures, heat treatments.

12. (A) Draw the iron-iron carbide equilibrium diagram and mark on it all salient temperatures

and composition fields. OR12. (B) Explain the following invariant reactions with reference to a phase diagram:

(a) Peritectic reaction and (b) Peritectoid reaction.

13. (A) (i) What do you understand by isothermal transformation?(ii) What are TTT diagrams?(iii)How a TTT diagram is drawn?(iv)Draw a neat sketch of the TTT diagram for a eutectoid steel and label the regions.Mark the different products formed on this diagram.

OR13. (B) (a) What is a CCT diagram?

(b) Describe various cooling curves on TTT diagrams. How such curves are drawn?(c) Write short notes on critical cooling rate.

14. (A) What is meant by carburizing of steels? Briefly explain the various types of carburizing.List and discuss the advantages of nitriding over carburizing.

OR14. (B) Describe the flame hardening and induction hardening process with the aid of neat sketch.

Differentiate between hardness and hardenability.

15. (A) Explain the Jominy end-quench method of determining hardenability. Explain the process

of nitriding.

OR15. (B) Explain briefly the theory of tempering of alloy steels in heat treatment process. What are

the effects of tempering temperature on mechanical properties of steel?

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MODEL EXAM III



Max Marks: 100


1. State Gibbs phase rule.

2. Differentiate between eutectic and eutectoid reactions.3. What is an equilibrium phase diagram?4. What are the purposes of the processing heat treatments?5. Distinguish the work hardening with the age hardening process.6. What is tempering? What are the objectives of performing it?7. Define the term critical cooling rate. What are the factors affecting it?8. Define the term slip and twinning.9. State the Schmids law.10.Define the term notch sensitivity.


11.(A) Draw and explain the iron-iron carbide equilibrium diagram and mark on it all salienttemperatures and composition fields.

OR




MODEL EXAM III



Max Marks: 100


1. State Gibbs phase rule.2. Differentiate between eutectic and eutectoid reactions.3. What is an equilibrium phase diagram?4. What are the purposes of the processing heat treatments?

5. Distinguish the work hardening with the age hardening process.6. What is tempering? What are the objectives of performing it?7. Define the term critical cooling rate. What are the factors affecting it?8. Define the term slip and twinning.9. State the Schmids law.10.Define the term notch sensitivity.

PART-B (Answer all) 5x16=8011.(A) Draw and explain the iron-iron carbide equilibrium diagram and mark on it all salient

temperatures and composition fields.OR


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12.(A) What are cooling curves? How does the time temperature cooling curve of an alloy of

eutectic composition differ from that of a pure metal?

OR12. (B) Explain the following invariant reactions with reference to a phase diagram:


13. (A) (i) What do you understand by isothermal transformation?(ii) What are TTT diagrams?

(iii)How a TTT diagram is drawn?(iv)Draw a neat sketch of the TTT diagram for a eutectoid steel and label the regions.Mark the different products formed on this diagram.

OR13. (B) (a) What is a CCT diagram?

(d) Describe various cooling curves on TTT diagrams. How such curves are drawn?(e) Write short notes on critical cooling rate.


OR14. (B) Describe the flame hardening and induction hardening process with the aid of neat sketch.

Differentiate between hardness and hardenability.

15. (A) What is brittle fracture? Explain the Griffiths theory on brittle fracture and deduce an

expression for the critical stress required to propagate a crack simultaneously in a brittle

material.

OR15. (B) What is meant by ductile fracture? Explain the mechanism of it.

12.(A) What are cooling curves? How does the time temperature cooling curve of an alloy of

eutectic composition differ from that of a pure metal?

OR12. (B) Explain the following invariant reactions with reference to a phase diagram:


13. (A) (i) What do you understand by isothermal transformation?(ii) What are TTT diagrams?(iii)How a TTT diagram is drawn?(iv)Draw a neat sketch of the TTT diagram for a eutectoid steel and label the regions.Mark the different products formed on this diagram.

OR

13. (B) (a) What is a CCT diagram?(f) Describe various cooling curves on TTT diagrams. How such curves are drawn?(g) Write short notes on critical cooling rate.


OR

14. (B) Describe the flame hardening and induction hardening process with the aid of neat sketch.Differentiate between hardness and hardenability.

15. (A) What is brittle fracture? Explain the Griffiths theory on brittle fracture and deduce an

expression for the critical stress required to propagate a crack simultaneously in a brittle

material.

OR

15.(B) What is meant by ductile fracture? Explain the mechanism of it.

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OR

13. (B) List the properties and typical applications of the following thermoplastics.

(iii) PTFE (ii) PMMA (iii) PET (iv) PEEK

14. (A) (a) Describe the difference between thermoplastics and thermosetting plastics.(d) Explain the difference between commodity plastics and engineering plastics.




OR

15. (B) Explain the strengthening mechanism of fibre-reinforced composites. List the advantages,limitations and applications of composite materials.


OR

12. (B) Discuss the composition, properties, and typical applications of any four copper alloys.


OR

13. (B) List the properties and typical applications of the following thermoplastics.(iv) PTFE (ii) PMMA (iii) PET (iv) PEEK

14. (A) (a) Describe the difference between thermoplastics and thermosetting plastics.(e) Explain the difference between commodity plastics and engineering plastics.






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