Thermoplastics and Thermosets - Synthesis, Manufacturing and Properties - Engineering Sciences Previous Year Questions

1

2008 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2008

Match the polymers in Group I with their crystalline melting point (m. p.) in Group II and select the right answer from (A), (B), (C) or (D).

Group I (polymers)	Group II (m. p., °C)
P. Nylon66	1. 108
Q. PBT	2. 320
R. PP	3. 264
S. LDPE	4. 165
	5. 220

A

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

B

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

C

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

D

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

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2

2008 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2008

The properties of three polymers are as follows:

	Polymer X	Polymer Y	Polymer Z
Density (kgm-3)	920	1130	900
Heat Distortion Temp. (°C)	40	110	55
Tensile strength (MPa)	10	85	35
Elongation at break (%)	600	200	400

Which of the following is true?

A

Polymer X is Commodity and Polymer Z is Engineering Plastic

B

Polymer Y is Commodity and Polymer X is Engineering Plastic

C

Polymer Z is Commodity and Polymer Y is Engineering Plastic

D

Polymer Y is Commodity and Polymer Z is Engineering Plastic

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3

2009 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2009

Molecular weight distribution of a polystyrene polymer and the number fraction of polymer chains in the molecular weight range are given below.

Range of Molecular weight (kg/mol)	Number fraction of polymer chain
5 - 10	0.05
10 - 15	0.15
15 - 20	0.20
20 - 25	0.30
25 - 30	0.20
30 - 35	0.08
35 - 40	0.02

The number average molecular weight and the number average degree of polymerization will be

A

15.750 kg/mol and 151

B

21.350 kg/mol and 203

C

15.750 kg/mol and 302

D

21.350 kg/mol and 205

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4

2009 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2009

Match the following materials given in Column I with their applications given in Column II.

Column I
P. Nylon
Q. Urea formaldehyde
R. Polyaniline
S. Alumina

Column II
1. Electrical switch housing
2. Conducting polymers
3. Heating Element
4. Gears for toys
5. Polishing material

A

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

B

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

C

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

D

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

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5

2009 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2009

Arrange the following polyamides (PA) in decreasing order of their melting points :
I. PA 66
II. PA 6
III. PA 10
IV. PA 12

A

IV > I > II > III

B

I > II > III > IV

C

III > II > IV > I

D

II > IV > III > I

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6

2010 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2010

Which one of the following molecules undergoes ring opening polymerization?

A

Cyclohexene

B

Caprolactam

C

Phenanthrene

D

Hydroquinone

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7

2010 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2010

Out of the following polymers, which one shows the highest melting temperature?

A

Poly(ethylene terephthalate)

B

Poly(propylene terephthalate)

C

Poly(butylene terephthalate)

D

Poly(hexylene terephthalate)

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8

2010 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2010

From the following four groups of polymers, identify the group in which all four polymers are semicrystalline

A

HDPE, PP, PS, UF

B

PET, PVC, PF, ABS

C

Nylon 6, EPDM, PMMA, SBR

D

Nylon 66, PP, HDPE, PET

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9

2010 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2010

The group of polymers consisting of LDPE, PP, PS and PVC is best categorized as

A

Engineering polymers

B

Biodegradable polymers

C

Commodity polymers

D

Natural polymers

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10

2011 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2011

Match the materials in Column-I with the descriptions in Column-II.

Column-I	Column-II
P. Polyacrylonitrile	1. Hard and brittle material
Q. Nylon-6,6	2. Very high temperature resistant polymer
R. Polytetrafluoroethylene (PTFE)	3. H-bonding
S. Ebonite	4. Acrylic fibre
	5. Rubber
	6. Polyester fibre

A

P-6, Q-3, R-2, S-1

B

P-2, Q-6, R-4, S-5

C

P-4, Q-2, R-6, S-5

D

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

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11

2011 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2011

The melting temperature of poly tetrafluoroethylene is higher than its degradation temperature due to

A

hydrogen bonding

B

π-hydrogen bonding

C

van der Waal's interaction

D

dipole moment interaction

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12

2012 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2012

Which of the following polymers is sensitive to moisture absorption?

A

Polyethylene

B

Polystyrene

C

Polyamide 6

D

Polybutadiene

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13

2014 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2014

Relate the three varieties of polyethylene in the left column with their chain structures given in the right column.
P. HDPE        1. long as well as short branches
Q. LDPE        2. only short branches
R. LLDPE      3. no branches

A

P-1, Q-3, R-2

B

P-3, Q-2, R-1

C

P-2, Q-3, R-1

D

P-3, Q-1, R-2

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14

2015 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2015

To which of the following category of materials does Teflon (PTFE) belong?

A

Thermosets

B

Thermoplastics

C

Elastomers

D

Block copolymers

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15

2015 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2015

The order of melting point for the given polymers is

A

Nylon 66 > PTFE > Nylon 6 > PP

B

Nylon 66 > Nylon 6 > PTFE > PP

C

PTFE > Nylon 66 > Nylon 6 > PP

D

PTFE > Nylon 6 > Nylon 66 > PP

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16

2015 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2015

Match the thermosetting resins to the raw materials they are synthesized from

A

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

B

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

C

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

D

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

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17

2016 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2016

The order of glass transition temperature for the given polymers is
[NR=natural rubber; PP=polypropylene; PE=polyethylene; PMMA=poly(methyl methacrylate)]

A

NR < PE < PP < PMMA

B

PE < NR < PP < PMMA

C

PE < PP < NR < PMMA

D

NR < PP < PE < PMMA

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18

2016 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2016

Match the product to the most suitable plastic listed below:

A

P: Baby feeding bottle – 1. Polypropylene; Q: Tiffin box – 2. Poly(ethylene terephthalate); R: Water bottle – 3. Poly(vinyl chloride); S: Blood bag – 4. Polycarbonate

B

P: Baby feeding bottle – 1. Polypropylene; Q: Tiffin box – 2. Poly(ethylene terephthalate); R: Water bottle – 3. Poly(vinyl chloride); S: Blood bag – 4. Polycarbonate

C

P: Baby feeding bottle – 1. Polypropylene; Q: Tiffin box – 2. Poly(ethylene terephthalate); R: Water bottle – 3. Poly(vinyl chloride); S: Blood bag – 4. Polycarbonate

D

P: Baby feeding bottle – 1. Polypropylene; Q: Tiffin box – 2. Poly(ethylene terephthalate); R: Water bottle – 3. Poly(vinyl chloride); S: Blood bag – 4. Polycarbonate

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19

2017 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2017

Poly(ethylene terephthalate) is synthesized from

A

Ethylene + dimethyl terephthalate

B

Ethylene + terephthalic acid

C

Glycerol + terephthalic acid

D

Ethylene Glycol + terephthalic acid

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20

2017 · Engineering Sciences · Synthesis, Manufacturing and Properties · Thermoplastics and Thermosets

Engineering Sciences (XE) 2017

Novolac and Resole are A-stage low molecular weight phenolic resin products that are

A

Soluble and fusible

B

Insoluble but fusible

C

Insoluble and infusible

D

Soluble and infusible

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