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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.
Find out the power - hollow shaft: A hollow shaft of internal diameter 400 mm & external diameter 450 mm is needed to transmit power at 120 rpm. Find out the power it may tran
Function of heat pump: Refrigerator The primary function of heat pump is to transfer heat from the low temperature system to the high temperature system, this transfer of
Generation of steam at constant pressure: Steam is pure substance. Like any other pure substance it can also be converted into any of the three states, that is, solid, liquid
Advantages of resistance welding 1. Resistance welding is very fast compared to arc welding. 2. Almost any combination of metals can be resistance welded provided necessa
Indicator diagram and indicated power: An indicated diagram is graph between pressure and volume. The former being taken on the vertical axis and latter on the horizontal axis
define environment and explain stockholm conference
Illustrate with required expression for Hammer Blow, Variation of tractive force, and Swaying Couple.
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W rite down the different assumptions in simple theory of bending. The assumptions which are made in theory of simple bending are stated below:
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