GATE XE Polymer processing PYQs & Answers — Page 2

Questions 11–20 of 21. Imported answers require independent review unless marked reviewed.

Topic practice 21 questionsPage 2 of 3

Match the following polymer product with its most appropriate processing technique

Polymer product: P. Bottle Q. Blister packaging R. Reinforced electric poles S. Sewage pipes

Processing technique:

Extrusion

Pultrusion

Injection blow molding

Thermoforming

Your answerChoose one option.

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

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

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

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

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Match the polymer processing operation with respect to its typical range of shear rate.

Processing Operation	Shear rate (s⁻¹)
P. Compression Moulding	1. 1000 - 10000
Q. Extrusion	2. 100 - 1000
R. Calendering	3. 1 - 10
S. Injection Moulding	4. 10 - 100

Your answerChoose one option.

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

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

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

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

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A single screw extruder is operating at a rotational speed of 2 revolutions per second for the extrusion of a Newtonian polymer under open-discharge conditions (in absence of a die, the pressure drop,

= 0). The extruder has a screw diameter,

= 5 cm, a channel depth,

= 0.4 cm, distance between flights,

= 1 cm, and a helix angle,

= 20°. Assume the value of

= 3.14. The volumetric flow rate (rounded off to 2 decimal places) is ______ cm³/s.

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Match the appropriate process technique in Column A to fabricate the product in Column B.

Column A	Column B
P — Blow molding	1 — Plastic buckets
Q — Rotational molding	2 — PVC sheet
R — Injection molding	3 — Basket ball
S — Calendering	4 — Plastic bottles

Your answerChoose one option.

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

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

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

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

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Polystyrene coffee cup can be most economically manufactured by

Your answerChoose one option.

thermoforming

injection molding

compression molding

blow molding

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A single screw extruder is to be used to manufacture a nylon rod of 0.5 cm diameter at a production rate of 2.5 cm s⁻¹. The density of solid nylon and nylon melt are 1.140 g cm⁻³ and 0.790 g cm⁻³, respectively. The melt flow rate through the die is ______ cm³ s⁻¹ (round off to two decimal places).

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A plastic bucket is manufactured by

Your answerChoose one option.

Compression molding

Injection molding

Extrusion

Blow moulding

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Match the following:


P. Plastic egg container	1. Injection molding
Q. Water tank	2. Extrusion
R. Chair	3. Rotational moulding
S. Cable	4. Thermoforming

Your answerChoose one option.

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

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

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

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

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The melt processing temperature of a semicrystalline thermoplastic polymer is

Your answerChoose one option.

Between T_g and T_m

Equal to T_m

Lower than T_m

Higher than T_m

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Match the following terminology to the appropriate polymer processing technique:

Terminology P. Die-swell Q. Breathing R. Plug-assisted S. Mastication

Process Technique

Two roll mill mixing

Thermoforming

Extrusion

Compression moulding

Your answerChoose one option.

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

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

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

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

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GATE XE Polymer processing PYQs

Question 121

Question 11

Question 15

Question 11

Question 9

Question 22

Question 6

Question 13

Question 107

Question 115