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Mass Effect - Material Science - Exam, Exams of Materials science

Baddi University of Emerging Sciences and TechnologiesMaterials science

Key points are: Mass Effect, Iron-Carbon Equilibrium, Eutectic Composition, Steel, Transformation, Aid, Affecting Corrosion, Lamination, Reinforcement, Fibre Reinforcement

Typology: Exams

2012/2013

Uploaded on 04/13/2013

pankhudi
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Cork Institute of Technology
Higher Certificate in Engineering in Biomedical Engineering – Award
(NFQ Level 6)
Summer 2006
Materials Science
(Time: 3 Hours)
Instructions
Answer 5 questions.
All questions carry equal marks.
Examiners: Mr. M. Walsh
Dr. D. Tallon
Prof. P. McHugh
Q1. (a) Label the parts on the Iron-Carbon equilibrium diagram in fig.1. Explain the cooling
transformation of steel at the eutectic composition. (12 marks)
(b) Describe with the aid of sketches, 2 methods of Surface Hardening. (8 marks)
Q2. (a) Discuss the factors affecting corrosion. (8
marks)
(b) Write a short note on 3 corrosion resistant metals. (6 marks)
(c) Describe, with the aid of a sketch, sacrificial coating of a metal. Which metal is
sacrificed? (6 marks)
Q3. (a) In relation to composites, discuss;
i) Lamination
ii) Fibre reinforcement
iii) Particle Reinforcement (12 marks)
(b) Show using sketches the effect of the direction of the grain on the strength of wood.
(8 marks)
pf3

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Cork Institute of Technology

Higher Certificate in Engineering in Biomedical Engineering – Award

(NFQ Level 6)

Summer 2006

Materials Science

(Time: 3 Hours)

Instructions Answer 5 questions.

All questions carry equal marks.

Examiners: Mr. M. Walsh Dr. D. Tallon Prof. P. McHugh

Q1. (a) Label the parts on the Iron-Carbon equilibrium diagram in fig.1. Explain the cooling transformation of steel at the eutectic composition. (12 marks) (b) Describe with the aid of sketches, 2 methods of Surface Hardening. (8 marks)

Q2. (a) Discuss the factors affecting corrosion. ( marks) (b) Write a short note on 3 corrosion resistant metals. (6 marks) (c) Describe, with the aid of a sketch, sacrificial coating of a metal. Which metal is sacrificed? (6 marks)

Q3. (a) In relation to composites, discuss; i) Lamination ii) Fibre reinforcement iii) Particle Reinforcement (12 marks) (b) Show using sketches the effect of the direction of the grain on the strength of wood. (8 marks)

Q4. (a) Discuss: i) Thermosetting Plastics ii) Thermo Plastics iii) Elastomers (8 marks) (b) Give a brief description of 3 additives with regard to polymeric materials. (6 marks) (c) Discuss Tensile testing of polymers, include sketches. What is the Secant Modulus? (6 marks)

Q5. (a) What is the glass transition temperature Tg? Include a sketch. ( marks) (b) Discuss the strengthening of glass, including thermal tempering and annealing. (6 marks) (c) What are the general properties of crystalline ceramics? (8 marks)

Q6. (a) Discuss allowable working stress in relation to materials in service. (6 marks) (b) What are the factors affecting fatigue in both metals and polymers? (8 marks) (c) Describe brittle and ductile fracture, include sketches. (6 marks)

Q7. (a) Explain with the aid of sketches how the jominy end-quench test is performed. (6 marks) (b) Describe full annealing and normalising, explaining why each process is performed and the condition of the material afterwards. (8 marks) (c) Discuss the theory of Mass Effect, in relation to hardening, include a sketch. (6 marks)