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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.
SIGNIFICANCE OF DEFECTS IN WELDS In the correct sense of the word, a defect is a rejectable discontinuity or a flaw of rejectable nature. Certain flaws acceptable in one t
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TUNGSTEN INERT GAS WELDING (TIG) In this process, an arc is struck between a non consumable tungsten electrode and the base metal. The tungsten electrode is called non consumab
(a) How are the cutting fluids classified ? Explain every class with a couple of lines. (b) A carbide cutting tool has tool life exponent n = 0.27. It gives a tool life of 60 mi
how to find bending moment diagram of cantilever beam.any formula
Simple Rules FIFO (first in first out) PN j = t aj SPT (shortest processing time) PN j = o j ODD (earliest operation due dates) PN j = t dj EDD (earliest job due
Find out the smallest force: A block weighing 800 N is raised up with the help of two 6o wedges B and C of negligible weights as illustrated in Figure. If the coefficient of s
Advantages of welding process Welding results in a good saving of material and reduced labour content of production. Low manufacturing costs. Dependability of the me
Cast Iron Electrodes There are three types of electrodes for welding of cast ions. a) Monel-cored electrodes (30 % Ni 70 % Cu) b) Fe-Ni (40 % Ni) c) Ni-electrodes (97 E) These
It is a 3-D drawing used by draftsmen, architects etc
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