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Q. What do you mean by Thermosetting plastics?
This plastic undergoes a number of chemical changes on heating and cure to infusible and practically insoluble articles. The chemical change is not reversible thermosetting plastics do not soften on reheating and can not be reworked. They rather become harder due to completion of any left-over polymerization reaction. Eventually, at high temperatures, the useful properties of the plastic get destroyed. This is called degradation. The commonest thermosetting plastics are: alkyds, epoxides, polyesters, phenolics and urea.
(a) Illustrate self-locking and self-energizing brakes. (b) The diameter of the drum is 250mm and the angle of contact is 90 o , If the operating force of 700 N is applied at th
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Q. Why are magnetic field system employed in practical electromechanical energy conversion devices rather than electric field systems? Ans. In case of magnetic field sys
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Illustrate throttling process and free expansion process in details? A fluid is confined in a cylinder by a spring loaded frictionless piston so that pressure in the fluid is a
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Pressure Vessel materials shall be as specified on the Vessel Data Sheet. All attachments to vessels shall be of the same ‘P Number' material as that for the pressure envelope,
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