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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.
Kinematics: We have seen the various types of motions which may be undergone by particles and rigid bodies. You may be able to understand the relationships of displacement, ve
Jib crane Mechanism: Sol.: Jib crane is taken in use to raise heavy loads. A load W is lifted up by pulling the chain through pulley D as shown in the adjacent figure.
Ordinate Dimensions Ordinate dimensions are not really a dimensions at all in that they did not indicate a measurement aur dimensions. Rather they annotate known co-ordinate po
sketch and discuss the uses and application of the following types of cam follower;knife edge,roller and flat ended.
It is estimated that the average number of surface defects in 20 square meter of paper produced by process is 3.what is probability of finding number more than 2 defects in 40 squa
Describe Mould Surface Coating? Mould surfaces are coated (after the pattern is drawn out) with certain materials possessing high refractoriness. It eliminates the poss
Design a shaft to transmit power from a motor to a lathe head stock through a pulley by means of a belt drive. The pulley weighs 200 N and is located at 300 mm from the centre of t
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Production of hydrochloric acid
refrigeratorequipments
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