A Firstranker's choice
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER- V (New) EXAMINATION — WINTER 2019
--- Content provided by FirstRanker.com ---
Subject Code: 2152307 Date: 29/11/2019
Subject Name: Plastic Extrusion Technology
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
--- Content provided by FirstRanker.com ---
MARKS
Q.1 (a) Fill in the blanks: 03
- Extruder suitable for processing UHMWPE is __________
- Die used for films is __________
- Function of Thrust bearing block is __________
--- Content provided by FirstRanker.com ---
(b) Define : Breaker plate , Reduction Gear Box, Extrusion , L/D ratio 04
(c) Differentiate between Single and Twin Screw Extruders in detail. 07
Q.2 (a) Why is hopper cooling necessary in hopper throat? 03
--- Content provided by FirstRanker.com ---
(b) Estimate the B-10 life of a thrust bearing given that: 04
P=45MPa N=125rpm K=10/3
B-10 std = 1,00,000 hrs
(c) Discuss various types of heating systems in screw extruders in detail. 07
OR
--- Content provided by FirstRanker.com ---
(c) What is Devolatilization? Discuss in detail with diagrams 07
Q.3 (a) Discuss manufacture of suction hoses with neat line diagram. 03
(b) Discuss Screw terminology like helix angle, pitch, flight depth, flight 04
land , L/D ratio and Compression, Ratio. Also mention significance.
(c) With a neat line diagram, discuss manufacture of Monofilaments . 07
--- Content provided by FirstRanker.com ---
OR
Q.3 (a) What is the role of reduction gear box? How many types of reduction 03
gear boxes are available in market? Give differences.
(b) Differentiate between corotating and counter rotating twin screw 04
extruder
--- Content provided by FirstRanker.com ---
(c) With a neat line diagram, discuss manufacture of wires and cables 07
Q.4 (a) Differentiate between screen pack and breaker plate. 03
(b) Differentiate between AC and DC motors 04
(c) With a neat line diagram, discuss manufacture of LDPE films. 07
OR
--- Content provided by FirstRanker.com ---
Q.4 (a) Discuss about mixing screws with diagrams. 03
(b) Discuss in detail, grooved barrel technology. 04
(c) With a neat line diagram, discuss manufacture of HDPE Pipes. 07
Q.5 (a) What are the key features of an extrusion line manufacturing 03
HMHDPE films.?
--- Content provided by FirstRanker.com ---
(b) What is IBC? Explain with advantages and disadvantages 04
(c) With a neat line diagram, discuss manufacture of biaxially oriented 07
films.
OR
Q.5 (a) Discuss thrust bearing block of twin screw extruders 03
--- Content provided by FirstRanker.com ---
(b) Discuss the process of nitriding in detail. 04
(c) Discuss raw material selection criteria for extrusion in detail. 07
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2019 Winter Question Papers || Gujarat Technological University