Download GTU B.Tech 2020 Winter 5th Sem 3152307 Plastics Extrusion Technology Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3152307 Plastics Extrusion Technology Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3152307 Date:27/01/2021
Subject Name:Plastics Extrusion Technology
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) Explain melting mechanism in extrusion.
03

(b) Define:
04
(i)
Breaker Plate
(ii)
Reduction Gear Box
(iii)
L/D Ratio
(iv)
Feed Hopper

(c) Discuss the working principle of a single screw extruder.
07
Also compare single screw v/s. twin screw extruder.


Q.2 (a) Compare Blown film with Cast film.
03

(b) Differentiate between corotating and counter rotating twin
04
screw extruder.

(c) With a neat line diagram, discuss the manufacture of Nylon
07
monofilaments.
Q.3 (a) Give the proper reason for uses of PVC screw and Nylon
03
screw.

(b) Discuss Grooved barrel technology.
04

(c) Define and discuss significance of : L/D ratio ; compression
07
ratio ; helix angle; root diameter ; flight depth ; breaker
plate ; screen pack




Q.4 (a) Differentiate between screen pack and breaker plate.
03

(b) List the types of dies are used for Blown film extrusion.
04
Draw any two.

(c) With a neat line diagram, discuss manufacture of wires and
07
cables.
Q.5 (a) Name the types die used for Sheet extrusion.
03

(b) Explain the coextrusion process in short with neat diagram.
04

(c) Explain the sheet manufacturing process with neat diagram.
07



Q.6 (a) Give two troubleshooting for manufacturing of Sheet.
03

(b) List the types of screw used for extrusion with neat
04
diagram.

(c) Give any five troubleshooting for manufacturing of Pipes.
07
Q.7 (a) Define : Drag flow, Pressure flow
03

(b) List the name of dies used for flat film with neat diagram.
04
1

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(c) Discuss various types of heating systems in screw extruders
07
in detail.



Q.8 (a) Draw the diagram of straight through die and cross head
03
die.
(b) What is the difference between blown films and cast films?
04
(c) Discuss raw material selection criteria for extrusion process
07
in detail.

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