Moulding and Forming Processes - Polymer Processing - Engineering Sciences Previous Year Questions

1

2008 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2008

The shear rate of a typical injection molding process is

A

1 s^{-1}

B

10 s^{-1}

C

100 s^{-1}

D

1000 s^{-1}

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2

2008 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2008

Match the raw materials in Group I with the polymer processing operation in Group II and select the correct answer from (A), (B), (C) or (D).

Group I (raw material)	Group II (processing operation)
P. polyethylene granules	1. Injection molding
Q. polycarbonate granules	2. Film extrusion
R. polystyrene sheet	3. Calendering
S. plasticized poly(vinyl chloride)	4. Thermoforming
	5. Rotational molding

A

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

B

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

C

P-2, Q-5, R-3, S-1

D

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

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3

2009 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2009

The temperature at which thermoforming is best carried out is

A

softening temperature

B

melting temperature

C

glass transition temperature

D

10 % above melting temperature

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4

2009 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2009

Pair the items in the Column I with those in the Column II.
Column I
Processing step
P. rotational molding
Q. extrusion
R. reaction injection molding
S. blow molding
Column II
Item
1. polyurethane
2. use of a gas
3. centrifugal force
4. twin screw

A

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

B

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

C

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

D

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

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5

2012 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2012

Match the following processing operations with their respective tools:

Processing operations	Tools
P. Injection molding	1. Parison mold
Q. Twin screw extrusion	2. Sprue-runner system
R. Blow molding	3. Mixing head
S. Reaction injection molding	4. Kneading blocks

A

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

B

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

C

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

D

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

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6

2015 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2015

Match the processing technique used to manufacture the appropriate product

A

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

B

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

C

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

D

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

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7

2016 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2016

Match the processing technique to the appropriate product listed below:

A

P: Blow molding – 1. Bucket; Q: Co-extrusion – 2. Blister packaging; R: Injection molding – 3. Bottles; S: Thermoforming – 4. Multilayered sheets

B

P: Blow molding – 1. Bucket; Q: Co-extrusion – 2. Blister packaging; R: Injection molding – 3. Bottles; S: Thermoforming – 4. Multilayered sheets

C

P: Blow molding – 1. Bucket; Q: Co-extrusion – 2. Blister packaging; R: Injection molding – 3. Bottles; S: Thermoforming – 4. Multilayered sheets

D

P: Blow molding – 1. Bucket; Q: Co-extrusion – 2. Blister packaging; R: Injection molding – 3. Bottles; S: Thermoforming – 4. Multilayered sheets

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8

2017 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2017

The melt processing temperature of a semicrystalline thermoplastic polymer is

A

Between T_g and T_m

B

Equal to T_m

C

Lower than T_m

D

Higher than T_m

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9

2017 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2017

Match the following terminology to the appropriate polymer processing technique:
Terminology
P. Die-swell
Q. Breathing
R. Plug-assisted
S. Mastication
Processing Technique
1. Two roll mill mixing
2. Thermoforming
3. Extrusion
4. Compression moulding

A

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

B

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

C

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

D

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

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10

2017 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2017

Match the processing technique in Column A to the corresponding shear rate (s^-1) in Column B:

Column A	Column B
P. Injection Moulding	1. 1-10
Q. Extrusion	2. 10-100
R. Calendering	3. 100-1000
S. Compression Moulding	4. 1000-10000

A

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

B

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

C

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

D

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

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11

2018 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2018

A plastic bucket is manufactured by

A

Compression moulding

B

Injection moulding

C

Extrusion

D

Blow moulding

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12

2018 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2018

Match the following:

A

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

B

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

C

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

D

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

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13

2019 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2019

Polystyrene coffee cup can be most economically manufactured by

A

thermoforming

B

injection molding

C

compression molding

D

blow molding

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14

2020 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2020

Match the appropriate processing technique in Column A to fabricate the product in Column B

A

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

B

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

C

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

D

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

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15

2021 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2021

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

A

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

B

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

C

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

D

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

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16

2022 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2022

Which of the following is a discontinuous polymer processing operation?

A

Calendering

B

Extrusion

C

Film blowing

D

Thermoforming

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17

2022 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2022

Match the following polymer product with its most appropriate processing technique

Polymer product	Processing technique
P. Bottle	1. Extrusion
Q. Blister packaging	2. Pultrusion
R. Reinforced electric poles	3. Injection blow molding
S. Sewage pipes	4. Thermoforming

A

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

B

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

C

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

D

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

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18

2023 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2023

From the options given, identify the correct match(es) between the polymer products with the most appropriate processing technique.

A

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

B

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

C

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

D

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

Check answer

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19

2024 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2024

Thermoforming operation of semi-crystalline polymers with glass transition temperature, \(T_g\), and melting temperature, \(T_m\), is carried out at a temperature \(T\), in the range of

A

\(T_g < T < T_m\)

B

\(T_g < T > T_m\)

C

\(T_g > T = T_m\)

D

\(T_g > T > T_m\)

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20

2025 · Engineering Sciences · Polymer Processing · Moulding and Forming Processes

Engineering Sciences (XE) 2025

Injection molding is typically used to make plastic parts. If the pressure at the gate is monitored as a function of time during the injection of a thermoplastic polymer, identify the profile that best describes this event.

A

Q

B

R

C

P

D

S

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