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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 Perspex tank ure 1), which has parallel sides for the top part of its height and a 'V' shaped section for the bottom part and a constant width throughout, is used as a receptacle
Q. Standard factory formed insulation on Flanges and Valves? All fittings are to be insulated with standard factory formed insulation. All joints shall be buttered and sealed.
Explain the working of Michelson's interferometer. How circular fringes he produced with it. (a) What are antireflection films and interference filters? (b) Find the reflecti
What is one way shear? Explain with a suitable demonstration. One Way Shear This worked out seen a similar case is the case of wall footings. For square footings also the cr
Heat distribution in spot welding Besides the resistance at the interface, there are six other resistance through which the same welding current is passed. They are: Res
Abrasive Machining Processes Such machining processes are precision machining processes. They generate work-piece surfaces along with a high degree of surface smoothness and d
In Grey Cast Iron, carbon is present in ------------form while in white cast iron, it is found in ----------- form.
Flash Butt Welding-Flashing The phenomenon of flashing is of extreme importance in achieving satisfactory welds. Flashing can begin only after a molten bridge has been formed s
Firecracker Welding This is a semi automatic version of SMAW. A specially designed heavy - coated electrode, which can be of any length upto 2 m, is laid on the seam of a groo
Gears interchange between Y2K and non Y2K model: Check for mixing of Y2K and non Y2K gears by seeing the identification marks provided on the gears.
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