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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.
Q. How can you test hardness of the prepared mould? Hardness test: The hardness of the prepared mould surface is tested to check the ramming density of the sand. The instrume
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
Q. What are Preheat and interpass temperature? Preheat and interpass temperatures shall be in accordance with the applicable codes. Materials that require preheat for welding
hot working vs cold working
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Discover modulus of elasticity of the composite: A composite of glass fibres and epoxy contain all fibres laid along the length and is needed to carry a stress of 1200 MPa. Th
Q. Explain about wire-frame model? A wire-frame model of an object is the simplest, but more verbose, geometric model that can be used to represent it mathematically in the com
Copper And Its Production Copper is marked via a host of good engineering properties. The foremost is copper's good electrical conductivity and bulk of copper is utilized as e
(a) The following forces (all pull) act at a point : (6) (i) 20 N North-East (ii) 25 N due North (iii) 20 N 30o East of South (iv) 15 N due East (v) 30 N 60o South o
Q. Explain about Nonconforming Material? If PMI test results indicate that the material or item does not meet the specified composition of the alloy, the subject material/item
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