GUJARAT TECHNOLOGICAL UNIVERSITY
SEMESTER-VI(NEW) — EXAMINATION - SUMMER 2019
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Subject Code:2162601 Date:10/05/2019Subject Name:Rubber Compound & Product Testing
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.
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Q.1 (a) Write a brief note on method-A to determine the dimensions of product. 03
(b) Why is it necessary to carry out the testing at different conditions? Also 04
(c) Discuss in detail about the purposes of testing. 07
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Q.2 (a) Define the term PRI with its formula. Also give practical significance 03 of PRI test.
(b) What do you mean by green shrinkage? How is it determined? 04
(c) Explain in detail about the principle of measuring micro hardness. 07
OR
(c) Write short note on “Durometer test”. 07
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Q.3 (a) Draw the appropriate diagram of the device for compression set under 03 constant deflection. Write the major components of the same.
(b) Differentiate the terms ‘wear’ and ‘abrasion’. List the different types of 04 wear mechanism with their example.
(c) Explain in detail about the basic elements of tensile machine with the 07 standard test procedure.
OR
Q.3 (a) Write the significance and use of compression set test. 03
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(b) Describe the working of ‘Akron’ and ‘Du.Pont’ type of arrangements 04 for abrasion test.
(c) Discuss in detail about the different variations in form of test piece for 07 tear test.
Q.4 (a) Draw the labeled diagram of vertical rebound apparatus. 03
(b) Write the significance and calculation for the measurement of retraction 04 at lower temperature.
(c) Discuss in detail about the interpretation of results for the measurement 07 of resistance to flex-cracking by De Mattia tester.
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OR
Q.4 (a) Write the standard procedure to determine rebound resilience by 03 vertical rebound apparatus.
(b) What is the standard procedure for the measurement of retraction at 04 lower temperature?
(c) Explain in detail about the apparatus and standard procedure for the 07 measurement of resistance to flex-cracking by De Mattia tester.
Q.5 (a) Write a brief note on ASTM reference fuels. 03
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(b) Draw a neat diagram of electrode assembly used to measure the volume 04 resistivity.
(c) Explain the term permeability. Discuss the constant volume method to 07 study permeability behavior of vulcanizate.
Q.5 (a) Write a brief note on ASTM reference oil. 03
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(b) Describe the given terms: (i) Volume Resistivity (ii) Surface Resistivity 04
(c) Explain the term solubility constant. Discuss the constant pressure 07 method to study permeability behavior of vulcanizate.
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