Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Summer 4th Sem New 2142301 Basic Plastic Processing And Thermal Engineering Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142301 Date:09/05/2019
Subject Name: Basic Plastic Processing and Thermal Engineering
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) What is Plastic Processing? List various processing methods for
thermoplastics and thermosets.
03
(b) What are Bulk factor and Preforms? Give Advantages and limitations of
Preforms.
04
(c) With neat diagram explain Rotational molding process steps. 07
Q.2 (a) Define: Thermoforming. List various thermoforming processes. Give
any two applications of thermoforming products.
03
(b) Define: Mold, Cavity, Blow ratio, Vent. 04
(c) Explain with neat diagram (i) Drape forming (ii) Twin sheet
thermoforming.
07
OR
(c) With neat diagram explain Plunger type transfer molding process. 07
Q.3 (a) Give difference between Extrusion Blow molding and Injection Blow
molding.
03
(b) Which are the factors to be considered for Compression molding?
Discuss.
04
(c) Give advantages and limitations and applications of Rotational molding. 07
OR
Q.3 (a) The outer surface of a 0.3m thick concrete wall (10 m x 3 m)
is kept at a temperature of 10 ?C while the inner surface is kept at 40 ?C.
Thermal conductivity of the concrete is 1.2 W/mK. Determine the rate
of heat loss through it.
03
(b) Give causes and remedies in Blow molding process for following
defects: (i) Parison Curl (ii) Rough Parison (ii) Warpage (iv) Variable
wall thickness.
04
(c) Give principle of Stretch Blow molding and explain Injection blow
molding process with neat diagram.
07
Q.4 (a) The outer surface temperature of a roof is 40 ?C and that of the ambient
air is 10 ?C. Calculate the rate of heat exchange between ambient air and
250 m
2
of outer roof area if the value of convective heat transfer
coefficient is 10 W/ m
2
K.
03
(b) Discuss melt stability and plastic memory properties for material
selection criteria in thermoforming.
04
(c) What is the role of Heat Exchanger? Discuss various types of Heat
exchanger in detail.
07
OR
Q.4 (a) What is the purpose of Preheating? List various method used for the
same.
03
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?IV(NEW) ? EXAMINATION ? SUMMER 2019
Subject Code:2142301 Date:09/05/2019
Subject Name: Basic Plastic Processing and Thermal Engineering
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) What is Plastic Processing? List various processing methods for
thermoplastics and thermosets.
03
(b) What are Bulk factor and Preforms? Give Advantages and limitations of
Preforms.
04
(c) With neat diagram explain Rotational molding process steps. 07
Q.2 (a) Define: Thermoforming. List various thermoforming processes. Give
any two applications of thermoforming products.
03
(b) Define: Mold, Cavity, Blow ratio, Vent. 04
(c) Explain with neat diagram (i) Drape forming (ii) Twin sheet
thermoforming.
07
OR
(c) With neat diagram explain Plunger type transfer molding process. 07
Q.3 (a) Give difference between Extrusion Blow molding and Injection Blow
molding.
03
(b) Which are the factors to be considered for Compression molding?
Discuss.
04
(c) Give advantages and limitations and applications of Rotational molding. 07
OR
Q.3 (a) The outer surface of a 0.3m thick concrete wall (10 m x 3 m)
is kept at a temperature of 10 ?C while the inner surface is kept at 40 ?C.
Thermal conductivity of the concrete is 1.2 W/mK. Determine the rate
of heat loss through it.
03
(b) Give causes and remedies in Blow molding process for following
defects: (i) Parison Curl (ii) Rough Parison (ii) Warpage (iv) Variable
wall thickness.
04
(c) Give principle of Stretch Blow molding and explain Injection blow
molding process with neat diagram.
07
Q.4 (a) The outer surface temperature of a roof is 40 ?C and that of the ambient
air is 10 ?C. Calculate the rate of heat exchange between ambient air and
250 m
2
of outer roof area if the value of convective heat transfer
coefficient is 10 W/ m
2
K.
03
(b) Discuss melt stability and plastic memory properties for material
selection criteria in thermoforming.
04
(c) What is the role of Heat Exchanger? Discuss various types of Heat
exchanger in detail.
07
OR
Q.4 (a) What is the purpose of Preheating? List various method used for the
same.
03
2
(b) What are the different types of heating system used for heating the
rotational mold? Discuss in brief.
04
(c) Write a note on: Parison Programming 07
Q.5 (a) Differentiate between Blow molding & Injection molding process. 03
(b) What is Pinch off? Explain materials used for preparation of Blow Mold. 04
(c) What is conduction? Give heat conduction equation using Fourier?s
Law.
07
OR
Q.5 (a) Give advantages and disadvantages of Transfer molding. 03
(b) List types of compression molds and explain any one with diagram. 04
(c) Explain Plug assist thermoforming process with neat diagram. 07
*************
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This post was last modified on 20 February 2020