Download GTU BE/B.Tech 2018 Winter 7th Sem New 2172311 Plastic Structure Property Relationship Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 7th Sem New 2172311 Plastic Structure Property Relationship Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2172311 Date: 26/11/2018

Subject Name: Plastic Structure Property Relationship

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Define additives? List various additives used for plastics. 03
(b) Draw the structures of i) PTFE ii) PVC iii) Nylon 6,6 iv)
PS
04
(c) List the differences in properties of crystalline and
amorphous polymers.
07

Q.2 (a) What are the important fields of application of PVC. 03
(b) Explain with examples what are Homochain and
Heterochain polymers.
04
(c) Explain the factors affecting the Tg of a polymer 07
OR
(c) Explain the effect of Hydrogen on the properties of
polymers
07
Q.3 (a) List the properties and applications of PMMA. 03
(b) Explain the effect of plasticizers on Tg of a polymer. 04
(c) Compare the structure & properties of HDPE and LDPE. 07
OR
Q.3 (a) What do you mean by tensile strength and impact strength
of a polymer.
03
(b) Why is Teflon used in the applications of non stick
coatings?
04
(c) Explain the effect of Carbon on the properties of
polymers.
07
Q.4 (a) What are blowing agents? Explain briefly. 03
(b) Explain how structure of a polymer affects its mechanical
properties.
04
(c)
Explain the factors affecting crystallinity in polymers.
07
OR
Q.4 (a) How does silicon affect the properties of a polymer. 03
(b) List the points of difference between thermoplastics and
thermosets.
04
(c) Write a short note on effect of halogens on properties of a
polymer.
07
Q.5 (a) Explain the relationship between structure of a polymer
and its optical properties.
03
(b)
Why is Nylon used extensively for the manufacture of gears and
bearings?
04
(c)
Discuss the structure and the properties of Bis-phenol A
Polycarbonates. What are its important applications?
07



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1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ?VII (NEW) EXAMINATION ? WINTER 2018
Subject Code: 2172311 Date: 26/11/2018

Subject Name: Plastic Structure Property Relationship

Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Define additives? List various additives used for plastics. 03
(b) Draw the structures of i) PTFE ii) PVC iii) Nylon 6,6 iv)
PS
04
(c) List the differences in properties of crystalline and
amorphous polymers.
07

Q.2 (a) What are the important fields of application of PVC. 03
(b) Explain with examples what are Homochain and
Heterochain polymers.
04
(c) Explain the factors affecting the Tg of a polymer 07
OR
(c) Explain the effect of Hydrogen on the properties of
polymers
07
Q.3 (a) List the properties and applications of PMMA. 03
(b) Explain the effect of plasticizers on Tg of a polymer. 04
(c) Compare the structure & properties of HDPE and LDPE. 07
OR
Q.3 (a) What do you mean by tensile strength and impact strength
of a polymer.
03
(b) Why is Teflon used in the applications of non stick
coatings?
04
(c) Explain the effect of Carbon on the properties of
polymers.
07
Q.4 (a) What are blowing agents? Explain briefly. 03
(b) Explain how structure of a polymer affects its mechanical
properties.
04
(c)
Explain the factors affecting crystallinity in polymers.
07
OR
Q.4 (a) How does silicon affect the properties of a polymer. 03
(b) List the points of difference between thermoplastics and
thermosets.
04
(c) Write a short note on effect of halogens on properties of a
polymer.
07
Q.5 (a) Explain the relationship between structure of a polymer
and its optical properties.
03
(b)
Why is Nylon used extensively for the manufacture of gears and
bearings?
04
(c)
Discuss the structure and the properties of Bis-phenol A
Polycarbonates. What are its important applications?
07



2


OR
Q.5 (a) Explain giving examples what are Homo polymers and
Copolymers.
03
(b) Which are the different forms of PP? List the applications
of PP.
04
(c)
Compare the structure of PVC with that of PE and explain how
the structure is related to its properties.
07

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