Download GTU BE/B.Tech 2018 Winter 5th Sem New 2152307 Plastic Extrusion Technology Question Paper

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Seat No.:

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Enrolment No.

GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION — WINTER 2018
Subject Code:2152307
Subject Name:Plastic Extrusion Technology

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Date:04/12/2018
Time: 10:30 AM TO 01:00 PM
Total Marks: 70

Instructions:
1. Attempt all questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

MARKS

Q.1 (a) Define : Extrudate ; Breaker plate, Reduction gear box 03
(b) Discuss about Ram Extruders with application 04

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(c) Discuss difference between Single and Twin Screw extruders. 07

Q.2 (a) Discuss thrust bearing block of twin screw extruders 03
(b) Discuss with line diagram manufacture of suction hose 04
(c) With neat diagrams, explain types of screws used on extruder machines. 07

OR

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(c) Explain the heating systems used for extruder machines 07

Q.3 (a) Discuss grooved barrel technology 03
(b) What is IBC? Explain with advantages and disadvantages 04
(c) With a neat line diagram, discuss manufacture of HDPE pipes 07

OR

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Q.3 (a) What is a Godet? Explain 03
(b) Differentiate between corotating and counter rotating twin screw extruder 04
(c) With a neat line diagram, discuss manufacture of Monofilaments. 07

Q.4 (a) What is sizing? 03
(b) Explain the working principle of a single screw extruder and twin screw extruder 04

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(c) With a neat line diagram, discuss manufacture of LDPE films 07

OR

Q.4 (a) What are the key features of an extrusion line manufacturing HMHDPE films.? 03
(b) What is co extrusion? Explain how gauge variation is practically adjusted in such systems. 04
(c) What is Devolatilization? Discuss in detail with diagrams 07

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Q.5 (a) Fill in the blanks: 03

1. die is used for secondary insulation
2. Die used for film manufacture is
3. RGB having highest efficieny is
4. Thrust bearing system of twin screw extruder works on technology

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(b) What is the function of Melt pump? 04
(c) With a neat line diagram, discuss manufacture of Wires and Cables 07

OR

Q.5 (a) Discuss raw material selection criteria for extrusion 03
(b) Discuss Nitriding process 04

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(c) Discuss manufacture of Biaxially oriented films 07