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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. Two coils with self inductances 1H and 4H have a mutual inductance of 1H. The RMS value of current flowing in the two coils is 4A and 1A respectively. Find the coupling factor
FUNCTIONS OF FLUX COATING The coating of the electrode performs very important functions which are essential for obtaining a weld of required quality; in terms of chemical compos
Axis perpendicular to the vertical plane - tetrahedron: A tetrahedron of side 60 millimeter has its base parallel to the VP, along with an edge of the base inclined at 45 o t
Evaluate force and moment: What force and moment is transmitted to supporting wall at A A force of 15 KN is transmitted to wall along with anticlockwise mome
Determine the resultant of the loads: A system of loads acting on beam is shown in the figure given below. Determine the resultant of the loads. Sol.: Let R be resultant
First law of thermodynamics applied to flow process
The intensity of loading on a simply supported beam of 5m span increases uniformly from 8KN/m at one end to 16KN/m at the other end. Determine the position and magnitude of the max
Lead Acid Battery : The lead acid type of battery is generally used in all types of two wheelers. It consists of six cells and the rating of the battery is 12 V-2.5 Ah and 12 V-5
What are the Forces Acting on Foundations Foundations are normally subjected to vertical loads which are resisted by compressive stress generated in the soil. However, the acti
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