Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 3rd Sem New 3132304 Semester ? Iii New Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3132304 Date: 30/11/2019
Subject Name: Thermoset Plastics: Materials and Processing Techniques
Time: 02:30 PM TO 05:00 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) List the basic characteristics of Thermoset Molding materials. 03
(b) Define i) Preforms ii) Bulk factor iii) Preheating 04
(c) Explain the manufacturing process of MF resin with a neat flow
diagram.
07
Q.2 (a) Explain the preparation of Melamine and Formaldehyde
monomers.
03
(b) Differentiate between Thermoplastics and Thermoset materials. 04
(c) Explain various preparation techniques of Phenol monomer. 07
OR
(c) Explain the preparation and curing mechanism of Epoxy resin. 07
Q.3 (a) Explain briefly about bulk factor of a material. 03
(b) List the properties and applications of Silicon. 04
(c) Explain the properties, processing characteristics and
applications of UF resin
07
OR
Q.3 (a) Explain briefly about Breathing in Compression Molding
Process.
03
(b) Draw a neat sketch of the Pot type transfer mold. 04
(c) Explain the raw material preparation and curing mechanism of
UF resin.
07
Q.4 (a) Explain briefly, the steps in compression molding. 03
(b) List the properties and applications of PF resin. 04
(c) Determine the height of powder well for a semi positive landed
compression mold for a cylindrical hollow product having outer
diameter 20mm and inner diameter 18mm. The height of the
product is 14 mm. The bulk factor of the material is 6 and the
land width is 5mm.
07
OR
Q.4 (a) List the advantages of Preforms. 03
(b) Explain about the importance Preheating and its methods. 04
(c) List and explain the advantages and disadvantages of Transfer
Molding.
07
Q.5 (a) Explain about Height of Powder well. 03
(b) List the properties and applications of Epoxy resin. 04
(c) Write a short note on Positive type compression mold. 07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? III (New) EXAMINATION ? WINTER 2019
Subject Code: 3132304 Date: 30/11/2019
Subject Name: Thermoset Plastics: Materials and Processing Techniques
Time: 02:30 PM TO 05:00 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) List the basic characteristics of Thermoset Molding materials. 03
(b) Define i) Preforms ii) Bulk factor iii) Preheating 04
(c) Explain the manufacturing process of MF resin with a neat flow
diagram.
07
Q.2 (a) Explain the preparation of Melamine and Formaldehyde
monomers.
03
(b) Differentiate between Thermoplastics and Thermoset materials. 04
(c) Explain various preparation techniques of Phenol monomer. 07
OR
(c) Explain the preparation and curing mechanism of Epoxy resin. 07
Q.3 (a) Explain briefly about bulk factor of a material. 03
(b) List the properties and applications of Silicon. 04
(c) Explain the properties, processing characteristics and
applications of UF resin
07
OR
Q.3 (a) Explain briefly about Breathing in Compression Molding
Process.
03
(b) Draw a neat sketch of the Pot type transfer mold. 04
(c) Explain the raw material preparation and curing mechanism of
UF resin.
07
Q.4 (a) Explain briefly, the steps in compression molding. 03
(b) List the properties and applications of PF resin. 04
(c) Determine the height of powder well for a semi positive landed
compression mold for a cylindrical hollow product having outer
diameter 20mm and inner diameter 18mm. The height of the
product is 14 mm. The bulk factor of the material is 6 and the
land width is 5mm.
07
OR
Q.4 (a) List the advantages of Preforms. 03
(b) Explain about the importance Preheating and its methods. 04
(c) List and explain the advantages and disadvantages of Transfer
Molding.
07
Q.5 (a) Explain about Height of Powder well. 03
(b) List the properties and applications of Epoxy resin. 04
(c) Write a short note on Positive type compression mold. 07
2
OR
Q.5 (a) Differentiate between Novolac and Resols. 03
(b) Explain the properties and applications of unsaturated polyester
resin.
04
(c) Write a short note on Semi-Positive type compression mold. 07
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This post was last modified on 20 February 2020