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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.
define elastomer.explain in details?
Tunnels: Tunnels become unavoidable for negotiating hills, where detours are costly. The tunnels in rock are not lined, but those in loose strata require a lining of cement c
Determine the maximum stress developed in the beam: An I section in Figure is utilized as a beam. The beam is subjected to a bending moment of 2.5 kN m at its neutral axis. De
Collapsible Soils and Subsidence There are soils which are quite stable when dry and they show large volume changes on wetting under load. Examples of these soils are loess (w
A cantilever of length 2m carries a uniformly distributed load of 1.5 KN/m run over the whole length and appoint load of 2KN at a distance of 0.5 from the free end draw the Shear
Corollaries of first law of thermodynamics: First law of thermodynamics has significant corollaries. Cor ollary 1: (First Law for process). There exists property of
game theory
Explain the super position of waves with neat diagrams
Enumerate the essential features of a milling fixture
Q. Identification of Defects of coating? All holidays and other coating defects, including without limitation primer blister, excess powder mounds, crazed coating, lifted and u
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