Download PTU B.Tech 2020 March Textile 3rd Sem Polymer And Fibre Science Question Paper

Download PTU (I.K. Gujral Punjab Technical University Jalandhar (IKGPTU) ) BE/BTech TE (Textile Engineering) 2020 March 3rd Sem Polymer And Fibre Science Previous Question Paper

1 | M ? 71655 (S2)-847
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (Textile)(2011 Onwards) (Sem.?3)
POLYMER AND FIBRE SCIENCE
Subject Code : BTTE-303
M.Code : 71655

Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
1. Answer briefly :
a) Why T
g
is referred to as a second order transition?
b) Is it possible to have an ordered amorphous polymer? Justify.
c) Mention four structural features that influence T
g
of a polymer.
d) Can fillers influence the degree of crystallinity of a polymer? Justify.
e) What information we can have from the SEM image of a polymer?
f) If a polymer sample does not give any X-ray pattern, what may the causes for the
same?
g) What are the different tactic forms of polymer and how they influence property?
h) Define conformation and configuration.
i) Define glass transition temperature of polymer,
j) Define average relaxation time of polymers.
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1 | M ? 71655 (S2)-847
Roll No. Total No. of Pages : 02
Total No. of Questions : 09
B.Tech. (Textile)(2011 Onwards) (Sem.?3)
POLYMER AND FIBRE SCIENCE
Subject Code : BTTE-303
M.Code : 71655

Time : 3 Hrs. Max. Marks : 60
INSTRUCTIONS TO CANDIDATES :
1. SECTION-A is COMPULSORY consisting of TEN questions carrying TWO marks
each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and students
have to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and students
have to attempt any TWO questions.

SECTION-A
1. Answer briefly :
a) Why T
g
is referred to as a second order transition?
b) Is it possible to have an ordered amorphous polymer? Justify.
c) Mention four structural features that influence T
g
of a polymer.
d) Can fillers influence the degree of crystallinity of a polymer? Justify.
e) What information we can have from the SEM image of a polymer?
f) If a polymer sample does not give any X-ray pattern, what may the causes for the
same?
g) What are the different tactic forms of polymer and how they influence property?
h) Define conformation and configuration.
i) Define glass transition temperature of polymer,
j) Define average relaxation time of polymers.
2 | M ? 71655 (S2)-847
SECTION-B
2. Discuss with neat sketch a method of measuring weight average molecular weight of
polymer.
3. What are thermoplastic and thermoset polymers and what are the differences in their
structural features that are responsible for their specific thermal response?
4. What are the differences in response of an amorphous and a crystalline polymer against
external load?
5. How can we estimate the orientation of molecules in the amorphous regions of a fibre? Is
there any correlation between orientation of molecules in the amorphous regions to that
of the orientation of crystals in fibres? Justify.
6. Discuss the factors that determine strength of a polymeric material.

SECTION-C
7. With suitable example enumerate the influences of molecular weight and fillers on the
mechanical properties of polymers.
8. Why polymers exhibit rubbery state? Discuss the concept of rubbery state and rubber
elasticity.
9. Discuss with a neat sketch the method of determination of degree of crystallinity and
orientation of fibre using wide angle X-ray diffraction.




NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.

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