GTU BE 8th Semester 182103 Composite Materials (Department Elective – II) Summer 2018 Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?VIII (old) – EXAMINATION ? SUMMER 2018
Subject Code:182103 Date:04/05/2018
Subject Name:Composite Materials (Department Elective – II)
Time:10:30 AM to 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a)Define composite materials in brief and state reasons with suitable examples – Why
Composite materials are the best suitable for the advanced applications.
07
(b)Give detail classification of the composite materials on the basis of reinforcement & Matrix
materials.
07

Q.2 (a) What do you mean by fiber? What is significance of L/D ratio? What is critical length (l/c) of fiber?
.
07
(b)Write Properties & Application of Carbon-fiber, Glass Fiber and Aramid fiber reinforced
Composites.
07
OR
(b)Compare Properties of Metal Matrix composite & Ceramic Matrix composites
07

Q.3 (a)What is rule of mixture?? Derive the equation of modulus of composite under Longitudinal
loading (Force parallel to fibre direction) & transverse loading condition (force
perpendicular to fibre direction).
07
(b)Explain the role of matrix materials & reinforcements. Also distinguish their
mechanical/chemical/physical properties, in brief.
07
OR
Q.3 (a)Justify the statement ?Design of composite means design of interface?.
07
(b)Explain with suitable examples & neat schematic various Particulate reinforced composites
and also discuss in brief, about their strengthening mechanisms.
07

Q.4 (a)Explain in brief, various types of interfaces develop in composites and also state the
significance of ?wettability? in the design of interfaces.
07
(b)Describe the toughening mechanism in MMC. ( Metal Matrix Composites) 07
OR
Q.4 (a)Explain with Neat schematic the ?filament winding process? & the components/parts
being manufactured using this method
07
(b)Mention various strengthening Mechanisms in composite and explain any one.
07

Q.5 (a)Briefly describe Sandwich Panels and explain prime reason for fabricating these structural
Composites.
07
(b)Explain with Schematic Vacuum Bag assembly process of manufacturing of composite &
mention common products manufactured by this method
07
OR
Q.5 (a) Draw & explain schematic of glass fibre manufacture.

07
(b) Describe fabrication techniques for ceramic matrix composites (CMC). What are
advantages of ceramic matrix composites over other two classes of composites?
07
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