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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.
Draw and also explain the stress strain diagram for the following materials a) Copper b) Ductile Materials c) Rubbers and Elastomers and d) Brittle materials.
Q. What do you mean by Bunds and Dikes ? A bund (or dike) is an embankment or wall of brick, stone, concrete or other impervious material, which surrounds the entire perimeter
state principle of virtual work
Calculate total deflection -two close-coiled helical springs: Two close-coiled helical springs are compressed among two parallel plates by a load of 1000 N. The springs contai
Produce as individuals a single tab Excel spreadsheet which shows a rough initial design for a water treatment plant taking 15MLD of water with 100 mg/l SS from a lake at 750mAOD,
In an engine working on Diesel cycle inlet pressure and tem are 1 bar and 17 o c respectively. Pressure at the end of adiabatic compression is 35 bar. He ratio of expansion i.e. af
A simple Rankine cycle works between pressures 28 bar and 0.06 bar, the initial condition of steam being dry saturated. Determine the cycle efficiency, work ratio and specific st
Find the magnitude of force: Q: The two parallel forces are acting at point A and B respectively is equivalent to force of 100 N acting downwards at point C and coupl
Explain the Advantages of Rack Cutter? a. A single cutter of any specific pitch can cut gears of any number of teeth having similar pitch. b. The tooth profile produced is m
Q. What is thermoplastic plastics ? These plastic soften under heat, harden on cooling, and can be resoften under heat. Thus, they retain their fusibility, solubility, an
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