1. Composite materials are

[a] made mainly to improve temperature resistance

[b] used for improved optical properties

[c] made with strong fibres embedded in weaker and softer matrix to obtain strength better than strength of matrix

[d] ) made with strong fibres embedded in weaker and softer matrix to obtain strength better than strength of both matrix and filler

2. Ceramic materials are

(a) good conductors of electricity

(b) basically crystalline oxides or metals

(c) inorganic compounds of metallic and non-metallic elements

(d) none of the above

3. Which one are inorganic materials

(a) biological materials

(b) minerals and ceramics

(c) plastics

(d) wood

4. Composite with molybdenum fibres and alumina matrix do not exhibit good strength because

(a) molybdenum is weaker than alumina

(b) molybdenum fibres develop micro cracks

(c) molybdenum does not form any bond with alumina

(d) molybdenum dissolves in alumina

5. Using cutting material which can sustain high temperature

(a) cement

(b) high carbon steel alloy

(c) composite of two metals

(d) none of the above

6. Which one does not require paint on its surface

(a) body of a railway wagon

(b) body of a car

(c) body of a machine tool

(d) body of an aeroplane

7. The other name for Polymer Matrix Composites (PMC's)

a)Fibre Reinforced Polymide

b)Fibre Reinforced Polymers (or Plastics)

c)Fibre Reinforced Polyester8. The properties of the composite are determined by

a) The properties of the fibre/resin

b) The ratio of fibre to resin in the composite (Fibre Volume Fraction)

c) The geometry and orientation of the fibres in the composite

d)All of the above

9. In general, since the mechanical properties of fibres are much higher than those of resins, the higher the fibre volume fraction

a) the higher will be the mechanical properties of the resultant composite.

b) the lower will be the mechanical properties of the resultant composite.

10. With a common hand lay-up process as widely used in the boat-building industry, a limit for Fiber Volume Fraction is approximately

a)10-20%

b) 30-40%.

c)50 60%

d)70-80%

11. The properties of composite material is

a)isotropic

b)Anisotropic

c)Orthotropic

12. In composites MMC is termed as

(a) Many matrix composites

(b) Metal matrix composites

(c) Modified metal composites

(d) Multi media Composites

13 Carbon fiber composites are used in Aerospace Design because

(a) Composites are advanced materials.

(b) Composites can be tailored to suit the Aero-elastic and other Design requirements.

(c) Composites are manufactured and machined easily without much details fabrication.

(d) Composites are good conductors of lightening

14. The word 'polymer' meant for material made from ______________.

(a) Single entity

(b) Two entities

(c) Multiple entities

(d) Any entity

15. Composite materials are classified based on:

(a) Type of matrix

(b) Size-and-shape of reinforcement

(c) Both

(d) None

16) Lightning protection is a major concern in

(a) military aircrafts

(b) transport aircrafts

(c) metallic aircrafts

(d) composite aircrafts

17) When FRP composites receive impact

a)it will yield or dent.

b)it has no yield point and will not dent

18) Choose the Reinforcement (any two) used in Metal matrix composites

a)Aluminium

b)Magnesium

c)Titanium

d)Boron

e)Copper

f)Zinc

g)Graphite

19)Choose the matrix (any two) used in Metal matrix composites

a)Iron & steel

b)Nickel

c)Alumina

d)Silica

20) Metal matrix composites compared to Polymer matrix composites have

a)Low thermal and electrical conductivity

b)Higher toughness

c)Lower transverse strength

d)Lower temperature capability

21) Metal matrix composites compared to Ceramic matrix composites have(choose any two)

a)Higher cost

b)Lower cost

c)Lower toughness & ductility

d)Higher toughness & ductility

22) Which of the following have low density

a)copper

b)Iron

c)Titanium

d)Aluminium

23) Density of Aluminium(gm/cm3)

a)1.7

b)2.7

c)3.7

d)4.7

24) Which of the following have high Modulus of elasticity

a)copper

b)Iron

c)Titanium

d)Aluminium

25) Which of the following have Low Modulus of elasticity

a)copper

b)Iron

c)Titanium

d)Aluminium

26) Which of the following have High heat conductivity

a)copper

b)Iron

c)Titanium

d)Aluminium

27) ARALL is

a)Alumina reinforced Aramid

b)Aluminum Reinforced Aramid

c)Aramid Reinforced Layer

d)None of these

28) GLARE is

a)Alumina reinforced Glass

b)Aluminum Reinforced Glass

c)Aramid Reinforced Glass

d)Glass Reinforced Aramid29) What is the fracture toughness(Mpam) of Epoxy

a)1

b)3

c)6

4)1030)What one of the following have the fracture toughness(Mpam) similar to Epoxy

a)Aluminium alloy

b)Silicon carbide

c)None

31) Reinforcing metal with Fiber will

a)Increase ductility and fracture toughness

b)Decrease ductility and fracture toughness

c) Decrease ductility and increase fracture toughness

d) Increase ductility and Decrease fracture toughness

32) Which of the following have higher coefficient of Thermal Expansion

a)Steel

b)Aluminium

33) Which of the following have higher coefficient of Thermal Expansion

a)SiC/Aluminium

b)Graphite/Aluminium

34) The following is a major design parameter for the elements which are required to be dimensionally stable

a)ultimate strength

b)modulus of elasticity

c)Micro yield strength

d)None

35) Micro yield strength is defined as the stress required to create a plastic strain of

a)0.01 m/m

b) 0.1 m/m

c) 1 m/m

d) 10 m/m

36) The Fiber used in Metal Matrix Composite is

a)Carbon

b)Aluminium

c)Ceramic

d)Silicon carbide

37) The reinforcement used in Ceramic Matrix Composite is made from

a)Ceramic

b)Carbon

c) silicon carbide and boron nitride.

d)Glass

38) The reinforcement used in Ceramic Matrix Composite is in the form of

a)Long fiber

b)Short fiber/whiskers

c) silicon carbide and boron nitride.

d)Silicate

39) Which of the following treatment applied to glass fibers to protect the strands from surface defects, bind the filaments into strand, and reinforce the interface bond to matrix

a)Finishing

b)Polishing

c)Sizing

d)None of the above40) Which of the following has excellent compression properties

a) Glass

b) Carbon

c) Aramid

41) Which of the following has poor compression properties

a) Glass

b) Carbon

c) Aramid

42) Aluminium in contact with carbon fibera)will corrode

b)will not corrode

43) Fibres in Composites are stronger than the bulk material because they have

a)near perfect crystal structureb)grains are aligned along the axis of the fibre

c)fewer defectsd) all the above

44) Which of the following has higher elongation (%) to failure?

a)E-Glass

b)S-Glass

c)Aramid

d)HS carbon45) The main function of the fibre is

a)give strength and modulus to the material

b)carry the loads

c)both a & b

d)none of the above

46) For better impact resistance the most suitable material is

a)Carbon / Epoxy

b)Kevlar / Epoxy

c)E-Glass / Epoxy

d)Boron / Epoxy47) Choose the correct answer in terms of specific tensile Strength and Modulus in increasing order

a)E Glass