Exam Details
| Subject | Composite Materials | |
| Paper | ||
| Exam / Course | B.Tech in Aerospace Engineering (BTAE) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | December, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 3
1BAS-022 I
B.Tech. AEROSPACE ENGINEERING
(BTAE)
Term-End Examination
December, 2016
BAS-022 COMPOSITE MATERIALS
Time: 3 hours Maximum Marks: 70
Note: Attempt any seven questions. All questions carry equal marks. Use of scientific calculator is permitted. Standard symbols and notations have usual meaning.
1. Describe the range of properties available in polyurethanes.
Enumerate the steps involved in making a thermoplastic composite. 5+5
2. What is a glass and how is it different from a ceramic? Explain.
Distinguish between addition and condensation polymerization and state which is the better method. 5+5
3. Distinguish between thermoplastics and thermosetting plastics.
What is meant by the term compounding of plastics What are the functions of the ingredients used in compounding of plastics? 5+5
4. What is the difference. between a polymer and a plastic? Explain.
What are the applications of fiber reinforced composites? Explain. 5+5
5. What is degree of polymerization How are the rigidity and melting point of a polymer related to its degree of polymerization
What are the two mechanisms of elastic deformation of elastomers such as rubber, which are absent in metals? 5+5
6. What is meant by the hardness of a metal? How is it determined? Suggest any suitable method to determine hardness index of a finished spur gear.
What are the major advantages of NDT Describe anyone of the NDT methods suitable for common flaws in casting. 5+5
7. A unidirectional Kevlar 49 fiber-epoxy composite contains 62 percent by volume of Kevlar 49 fibers and 38 percent epoxy resin. The density of
the Kevlar 49 fibers is 1.50 Mg/m3 and that of the epoxy resin is 1.25 Mg/m3.
What are the weight percentage of Kevlar 49 and epoxy resin in the composite material
What is the average density of the composite? 5+5
8. What are Ceramic-matrix composites Explain briefly.
What are 'Laminates'? Give examples. 5+5
9. What is 'Polymorphism' Explain briefly.
Calculate the volume ratio of aluminium and boron in AI-Boron composite which can have the Young's modulus equal to that of iron. Young's modulus of aluminium, iron and boron are 71 GN/m2, 210 GN/m2 and 440 GN/m2, respectively. 5+5
10.(a) Differentiate between a composite and an alloy.
Calculate the modulus of elasticity for a composite material consisting of 62 percent by volume. of continuous E-glass fiber and 38 percent epoxy resin for the matrix when stressed under isostress conditions the material is stressed perpendicular to the continuous fiber). The modulus of elasticity of the E-glass is 72 GPa and that of the epoxy resin is 3 GPa. 5+5
1BAS-022 I
B.Tech. AEROSPACE ENGINEERING
(BTAE)
Term-End Examination
December, 2016
BAS-022 COMPOSITE MATERIALS
Time: 3 hours Maximum Marks: 70
Note: Attempt any seven questions. All questions carry equal marks. Use of scientific calculator is permitted. Standard symbols and notations have usual meaning.
1. Describe the range of properties available in polyurethanes.
Enumerate the steps involved in making a thermoplastic composite. 5+5
2. What is a glass and how is it different from a ceramic? Explain.
Distinguish between addition and condensation polymerization and state which is the better method. 5+5
3. Distinguish between thermoplastics and thermosetting plastics.
What is meant by the term compounding of plastics What are the functions of the ingredients used in compounding of plastics? 5+5
4. What is the difference. between a polymer and a plastic? Explain.
What are the applications of fiber reinforced composites? Explain. 5+5
5. What is degree of polymerization How are the rigidity and melting point of a polymer related to its degree of polymerization
What are the two mechanisms of elastic deformation of elastomers such as rubber, which are absent in metals? 5+5
6. What is meant by the hardness of a metal? How is it determined? Suggest any suitable method to determine hardness index of a finished spur gear.
What are the major advantages of NDT Describe anyone of the NDT methods suitable for common flaws in casting. 5+5
7. A unidirectional Kevlar 49 fiber-epoxy composite contains 62 percent by volume of Kevlar 49 fibers and 38 percent epoxy resin. The density of
the Kevlar 49 fibers is 1.50 Mg/m3 and that of the epoxy resin is 1.25 Mg/m3.
What are the weight percentage of Kevlar 49 and epoxy resin in the composite material
What is the average density of the composite? 5+5
8. What are Ceramic-matrix composites Explain briefly.
What are 'Laminates'? Give examples. 5+5
9. What is 'Polymorphism' Explain briefly.
Calculate the volume ratio of aluminium and boron in AI-Boron composite which can have the Young's modulus equal to that of iron. Young's modulus of aluminium, iron and boron are 71 GN/m2, 210 GN/m2 and 440 GN/m2, respectively. 5+5
10.(a) Differentiate between a composite and an alloy.
Calculate the modulus of elasticity for a composite material consisting of 62 percent by volume. of continuous E-glass fiber and 38 percent epoxy resin for the matrix when stressed under isostress conditions the material is stressed perpendicular to the continuous fiber). The modulus of elasticity of the E-glass is 72 GPa and that of the epoxy resin is 3 GPa. 5+5
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Subjects
- Aerodynamics- I
- Aerodynamics- II
- Aircraft Design/Launch Vehicle/ Rocket Design
- Aircraft Instruments
- Aircraft Safety and Maintenance Engineering
- Aircraft Structures
- Aircraft Systems And Airworthiness Requirements
- Applied Chemistry
- Applied Physics
- Basic Control Theory
- CNS-ATM system
- Composite Materials
- Computer Fundamentals
- Engineering Drawing
- Environmental Science
- Flight Mechanics
- High Speed Aerodynamics
- Instruction To Computer Play Device
- Introduction to Aeronautics
- Introduction To Rocket And Missiles
- Mechanics Design
- Propulsion- I
- Propulsion- II
- Rocket Propulsion
- Space Dynamics
- Strength of Materials
- Technical Writing and Communication Skills
- Workshop Technology