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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.
can u please explain me d concept of 2nd law of thermodynamics. I am not so sure about it ??
Determine strap beam with suitable demonstration. Here observe that R e becomes greater than P e by a magnitude of V while R i becomes less than P i by a magnitude equal to
Material Selection and Process Mapping Selecting an optimal material from numerous candidates in one competitive aspect of manufacturing depends on factors such as properties,
constraint force
Find the Laplace transform of the following differential equation: ? +3? +6x = 0, x(0) =0, ?(0)=3 Taking the inverse Laplace transform of X(s), obtain the time solution x(t).
question no 2,page no 84 of strenght of materials by G H Ryder
Multiple Spot Welding This is a modification of spot welding, in which two or more than two welds can be obtained simultaneously from each transformer secondary. For specific pro
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Determine hardness of material: Hardness is surface property. It can be defined as resistance of material against permanent deformation of surface in the form of scratch, inde
Various Components of Transmission System Primary Drive Gear : It is mounted on crankshaft. It transfers power to primary driven gear. Primary Driven Gear : It is
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