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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.
the time of flight on any incline plane.
Calculate for spring amount of load carried: The table below gives specific of a compound spring consisting of two co-axial close-coiled springs. If the spring is subjected to
Alignment of a Railway Line: Selection of Alignment The following points must be considered in selecting the alignment of a railway line : (a) It should be as direct
Valve Clearance and Tappet Adjustment: Like all metal components the valve expands on heating. Hence the valve clearance is set so that on expansion there is room for the valve to
show that work is a path function and not a point funtion ?
Vitrification This is liquid phase sintering. It is achieved via incorporating a component that melts to viscous liquid during sintering. Such viscous liquid solidifies in gla
Spot welding of different metals Though, mild steel is t he metal most commonly used, any prime metal or alloy can be successfully spot welded provided that machine with suitab
Explain Thermodynamics System In thermodynamics the system is illustrated as the quantity of matter or region in space upon which the concentration is concentrated for the sake
If Equivalent force F and F acting on rigid body are not in line Sol.: If equivalent force of same magnitude 'F' acting on the rigid body are not in line, then there is no c
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