Polymer Reinforcement and Fibre Composites - Polymer Blends and Composites - Engineering Sciences Previous Year Questions

1

2007 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2007

The mechanism which does NOT contribute to toughening in a SiC whisker reinforced alumina ceramic matrix composite is

A

crack tip deflection

B

transformation toughening

C

forming bridges across the crack face

D

absorbing energy during pull-out of whiskers from the matrix

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2

2007 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2007

The specific modulus of elasticity of the composite in the longitudinal direction is

A

2.76 MPa.m^3.kg^-1

B

112.11 GPa

C

161.44 GPa

D

112.11 MPa.m^3.kg^-1

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3

2007 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2007

The density of the composite in kg.m^-3 is

A

1440

B

1200

C

1800

D

1340

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4

2008 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2008

The volume % of mica in the composite is

A

25.95

B

17.60

C

14.83

D

39.27

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5

2008 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2008

The modulus of elasticity of the composite is

A

12.8 GPa

B

20.3 GPa

C

5.3 GPa

D

31.7 GPa

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6

2008 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2008

A bamboo racquet stem is designed to have a Young’s modulus of 230 GPa. The stem is made up of long, oriented carbon fibres parallel to the stem axis in an epoxy matrix. The Young’s moduli of carbon fibre and epoxy are 400 GPa and 3 GPa respectively. The volume fraction of the fiber in the composite should be

A

0.006

B

0.428

C

0.572

D

0.994

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7

2009 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2009

A continuous and aligned carbon fibre reinforced composite is made up of 30 vol% carbon fibre having a modulus of elasticity of 300 GPa dispersed in a polymer matrix which on hardening has a modulus of elasticity of 4 GPa. What will be the modulus of elasticity of the composite in longitudinal and transverse directions of the carbon fibres respectively ?

A

92.8 GPa and 5.7 GPa

B

211.0 GPa and 9.3 GPa

C

304.0 GPa and 7.5 GPa

D

92.8 GPa and 6.7 GPa

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8

2009 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2009

The modulus of the composite is

A

121 GPa

B

215 GPa

C

285 GPa

D

142.5 GPa

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9

2009 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2009

The fibre-matrix bond strength, assuming a critical fibre length of 12 mm, is

A

258 MPa

B

2.58 MPa

C

25.8 MPa

D

0.258 MPa

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10

2010 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2010

The density of the composite in the units of kg/m³ is

A

1495

B

1554

C

1672

D

1790

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11

2010 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2010

The tensile modulus of elasticity of the composite under iso-strain condition is

A

5.5 GPa

B

11.0 GPa

C

102.9 GPa

D

205.8 GPa

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12

2011 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2011

Fiber glass composites are prepared by coating unidirectional fiber glass with epoxy prepolymer. If slippage DOES NOT occur at the interface in the loading in the direction of fiber, then

A

force sheared by fiber glass (P_f) and matrix (P_m) should be equal

B

strain as well force in fiber (ε_f and P_f) are both equal to strain and the force in matrix (ε_f and P_m)

C

strain at the interface between fiber glass (ε_f) and matrix (ε_m) should be equal

D

None of the above is true

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13

2011 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2011

The volume fraction of the glass fibres is

A

0.398

B

0.434

C

0.497

D

0.566

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14

2011 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2011

If the cross-sectional area of the composite is 300 mm², and a stress of 100 MPa is applied in the longitudinal direction, what will be the total load (in kN) carried by the glass fibres?

A

0.5

B

5

C

20.5

D

29.5

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15

2012 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2012

The Young’s modulus of the composite is

A

1.77 × 10³ kg/cm²

B

1.99 × 10³ kg/cm²

C

2.34 × 10³ kg/cm²

D

2.77 × 10³ kg/cm²

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16

2013 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2013

A reinforced polymer composite is made by the incorporation of

A

elastomers into the polymer.

B

fibers into the polymer.

C

plasticizers into the polymer.

D

gaseous additives into the polymer.

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17

2013 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2013

In carbon fiber reinforced resin composites, for a given fiber volume content, Young’s modulus depends on the orientation of the fiber with respect to the applied load. Which orientation of the fibers will give the maximum value of Young’s modulus?

A

transverse

B

longitudinal

C

random

D

both transverse and longitudinal

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18

2014 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2014

Match the composite in Column I with the most suitable application in Column II.

Column I	Column II
(P) Glass fibre reinforced plastic	(1) Missile cone heads
(Q) SiC particle reinforced Al alloy	(2) Commercial automobile chassis
(R) Carbon-carbon composite	(3) Airplane wheel tyres
(S) Metal fibre reinforced rubber	(4) Car piston rings
	(5) High performance skate boards

A

P-4, Q-5, R-1, S-2

B

P-3, Q-5, R-2, S-4

C

P-5, Q-4, R-1, S-3

D

P-4, Q-2, R-3, S-1

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19

2016 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2016

A composite material contains 30 % by volume of uniaxially aligned glass fibres in a matrix of alkyd resin. The tensile moduli of the glass fibre and alkyd resin are 76 GPa and 3 GPa, respectively. If a tensile stress of 100 MPa is applied parallel to the fibres, the percentage longitudinal strain is ______ .

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20

2016 · Engineering Sciences · Polymer Blends and Composites · Polymer Reinforcement and Fibre Composites

Engineering Sciences (XE) 2016

The weight of graphite fiber (density = 1800 kg m^-3) that should be added to 1.00 kg of vinyl ester resin (density = 1250 kg m^-3) to produce a composite with a density of 1600 kg m^-3 is ______ kg.

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