GTU BE/B.Tech 2018 Winter Question Papers || Gujarat Technological University
Subject Name: Basic of Plastic Material Testing
Time: 02:30 PM TO 05:00 PM Total Marks: 70
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-III (NEW) EXAMINATION — SUMMER 2019
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Subject Code: 2132303 Date: 11/06/2019Subject Name: Basic of Plastic Material Testing
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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| Marks | |
|---|---|
| Q.1 (a) What is Testing? List various reasons for testing. | 03 |
| (b) Give characteristics of plastics, sink/float when immersed in to water (a) PE (b) PVC (c) PS (d) Nylon. | 04 |
| (c) Define MFI. Explain Melt flow index test procedure with diagram. | 07 |
| Q.2 (a) Give full name of: ASTM, ISO, and BS. | 03 |
| (b) Give density of: HDPE,PP,PVC and PS. | 04 |
| (c) What is ASTM standard to determine Tensile Test for plastics material? Draw tensile test sample and explain test procedure in detail. | 07 |
| OR | |
| (c) Explain stress-strain behavior for Plastic materials. | 07 |
| Q.3 (a) Draw the test specimen as per ASTM for Compression, Abrasion, and Flexural strength. | 03 |
| (b) Width and thickness of tensile test specimen is 8mm and 3mm respectively. If tensile strength at yield point is:550 kg/cm². Calculate load recorded at yield point. | 04 |
| (c) Discuss determination of specific gravity using specific gravity bottle/pycnometer. | 07 |
| OR | |
| Q.3 (a) Define: Standard, Specification, and Conditioning. | 03 |
| (b) Explain cup flow test for thermoset materials. | 04 |
| (c) What is Hardness? Give ASTM standard for Rockwell hardness. Explain Rockwell hardness test. | 07 |
| Q.4 (a) Write flame characteristic and kinds of smoke generated during burning of PE-and PVC. | 03 |
| (b) Explain test method to determine water absorption of plastics. | 04 |
| (c) What is flexural strength? Explain the flexural strength test in detail with ASTM standard, procedure and factors affecting the test results. | 07 |
| OR | |
| Q.4 (a) List three thermoplastic and three thermoset materials having self-extinguishing properties. | 03 |
| (b) Define: (1) Yield point (2) Modulus of elasticity (3) Toughness (4) Proportional limit. | 04 |
| (c) Explain the test method to determine Density of plastic material in detail. | 07 |
| Q.5 (a) Give any three example of transparent plastic. | 03 |
| (b) Discuss sample preparation technique for thermoplastic materials. | 04 |
| (c) Explain Izod impact test in detail with factors affecting the test results. | 07 |
| OR | |
| Q.5 (a) Calculate compressive strength of the specimen having Height 2.5 cm, Length 1.4 cm and Width 1.4 cm. Load recorded at crushing is 490 kg. | 03 |
| (b) Explain spiral flow test with neat diagram. | 04 |
| (c) Explain charpy impact test in detail with neat sketch. | 07 |
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