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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.
can you help me to do my project on machine design,it is specific project with calculation and some draw.
Torsion of a Cylinder Let a cylinder of length l and radius R be clamped at one end and twisted at the other end by applying a torque τ about the axis of the cylinder. Each
what is gauge pressure?
The three prototyping methods used are: a) R a p i dPrototyping: This is used to model the pins (large 1, 2 and small), lock disk and crank. b) CNCMachining: Use
Pure Torsion: What do you mean by pure Torsion? In general two typ
Describe the key terms i. Write two differences between boiler and turbine. ii. Compare the rankine cycle with carnot cycle in terms of efficiency and work ratio iii.
Derive 3-D non-steady state conduction equation in spherical co-ordinates. Explain the assumption involved. The hot combustion gases of a furnance are divided from the ambient a
Heat Treatment of Tool Steels This treatment in case of tool steels in a significant step before actually employing the tool. Most properties are attained after heat treatment
A sign of uniform density weighs 270 lb and is supported by a ball-andsocket joint at A and by two cables. Determine the tension in each cable and the reaction at A.
Function of heat pump: Refrigerator The primary function of heat pump is to transfer heat from the low temperature system to the high temperature system, this transfer of
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