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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.
Estimate the Cutting Time A surface 115 mm wide and 250 mm long is to be rough milled with a depth of cut of 6 mm by a 16-tooth cemented carbide face mill 150 mm in diameter.
Q. Categorization of Geometric models? Modern CAD systems define objects in 3-D. Thus, the designer can construct 3-D model of objects conveniently and store the database of th
Q. Applications of high temperature materials? A brief description of materials of construction used for common high temperature components in furnaces, boilers, superheaters,
Atomic Hydrogen Welding In this process, an arc is struck between two tungsten electrodes using AC power supply.The Streams of hydrogen gas are passed from orifices around the
Q1. A short vertical column consists of a channel section with the dimensions shown in Figure 1(a). The column (part of a system used to support a machine) carries a compressive p
Evaluate the tension in the rope: Determine the tension in the rope. Solution KE of the free-body of flywheel is developed due to (i) work-done by tension T in the rop
Evaluate the reactions at hinge and roller support: Q: A Force P = 5000N is applied at centre C of beam AB of length 5m as shown in figure given below. Find the reactio
Determine the Forces On Bar Two bars and a cable are used to support a block as shown. The two bars have negligible weight and the pulley is free to rotate. The mass of the pu
WHO IS HOME MINISTER OF INDIA OF 2014?
The Radius Dimension Command The Radius command is quite identical to the Diameter command except that the dimension measurements a radius rather than a dimension and the resul
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