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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 large hydraulic cylinder is to be treated using autofrettage, taking 80% of the wall thickness into the plastic range. The external diameter of the vessel is 200mm and the inter
equivalent evaporation of boiler..?
A Mercedes-Benz 300SL (m = 1600 kg) is parked on a road that rises 20° above the horizontal. (a) What is the static frictional force that the ground exerts on the tires? (b) Wh
Given: A brittle material has an ultimate tensile strength of 300 MPa and an ultimate compressive strength of -1000MPa. Assume that failure can be represented by the Modified
advantages and disadvantages of hot working
Draw shear force diagrams for the overhanging beam: Draw shear force & bending moment diagrams for the overhanging beam illustrated in Figure Figure Solution
Q. Illustrate Moisture content test ? Moisture content test: Moisture is an important constituent of moulding sand. Its content in the moulding sand can be estimated as given b
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The density of a sample of oak is 0.90 g/cm^3. Calculate a. the density of completely dry oak b. the percent water in the original sample
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