GATE XE Polymer blends and composites PYQs & Answers — Page 2

Questions 11–20 of 23. Imported answers require independent review unless marked reviewed.

Match the polymers with their characteristic infrared (IR) stretch frequency

Polymer: P. Polyurethane Q. Polyethylene R. Polysulfone S. Acrylonitrile-butadiene-styrene copolymer

IR stretch (cm⁻¹):

~234

~151

~1720

~2914

Your answerChoose one option.

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

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

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

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The thermal conductivity values of glass fiber and epoxy resin are 1.05 W m

and 0.25 W m

, respectively. The thermal conductivity of a glass fiber reinforced epoxy composite with a fiber content of 60% by volume along the fiber direction is ________ W m

(rounded off to two decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The tensile modulus of a thermosetting polyester resin and glass fiber are 3 GPa and 80 GPa, respectively. If a tensile stress of 110 MPa is applied along the fiber direction on a continuous uniaxially aligned glass fiber reinforced thermosetting polyester composite with a fiber content of 60% by volume, the resulting strain will be ________ ×

(rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Binary polymer blends of polypropylene and polyamide 6 are immiscible. From a thermodynamic viewpoint this is due to ________.

Your answerChoose one option.

low enthalpy of mixing

high entropy of mixing

high enthalpy of mixing

low entropy of mixing

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A unidirectional composite of epoxy and carbon fiber of 50% by volume is made. The elastic modulus of epoxy and carbon fiber are 3.5 GPa and 350 GPa, respectively. The ratio (rounded off to one decimal place) of the modulus of the composite to the matrix modulus is ______.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

A miscible blend in 1:1 (by weight) composition is formed with

Your answerChoose one option.

Polystyrene and polybutadiene

Polystyrene and poly(phenylene oxide)

Polystyrene and poly(methyl methacrylate)

Polystyrene and poly(dimethyl siloxane)

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Glass fibre reinforced PP composite is to be prepared with 20 volume % of glass fibre. The densities of glass fibre and PP are 2540 kg m⁻³ and 900 kg m⁻³, respectively. The mass of glass fibre required to produce 1 kg of the composite in kg is ______ (round off to 2 decimal places).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Match the material classification in Column A with the appropriate one in Column B: (PS=polystyrene, PPO=polyphenylene oxide, PDMS=poly(dimethyl siloxane), PP=polypropylene, PE=polyethylene, PP-g-MA=maleic anhydride grafted PP)

Column A P. Miscible blend Q. Immiscible blend R. Compatibilized blend S. Polymer composite

Column B

PDMS + fumed silica

Nylon 6 + PP-g-MA + PP

PS + PPO

PE + PP

Your answerChoose one option.

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

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

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

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

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

In a unidirectional carbon fibre/vinyl ester composite, the ratio of the moduli of the carbon fibre to that of vinyl ester is 35 and the fibres take up 50% of the cross-section. The percentage of applied force taken up by the fibres is ______ % (round off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Glass fibers in nylon provide reinforcement. The modulus of elasticity for each component of the composite is; E

= 10.5 x 10

psi; E

= 0.4 x 10

psi. If the nylon contains 30 % E-glass, the fraction of the applied force is carried by the glass fiber is__________. (Assume that both glass fiber and nylon have equal strain).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE XE Polymer blends and composites PYQs

Question 123

Question 128

Question 129

Question 2

Question 14

Question 7

Question 18

Question 15

Question 18

Question 20