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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.
A perfect gas flows through a nozzle when it expends in a reversible adiabatic manner, the inlet conditions are 22 bar,, 500 o c, 38 m/s. At exit the pressure is 2 bar. Evaluate th
A body is subjected to two harmonic motions as given below : X 1 = 15 sin (wt + 30 0 ) and X 2 = 8 cos (wt + 60 0 ). What harmonic motion should be given to the body to bring
Define the Advantages of Electro discharge machining 1. The surface finish obtained is very good. 2. This process can be used for any hard material. 3. Materials likes ca
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Torsional equation: Derive the Torsional equation T / J = Π /R = Gθ / L Or Derive an expression for the shear stress in shaft subjected to a torque. Sol.
ESSENTIAL S OF A GOOD BOILER: - Should be capable of producing the required Steam at the required pressure for minimum fuel required. - Should be capable of stan
Structural notches In t he case of solid solution strengthened alloys and age hardenabled steel, the variation in heat i/o during welding may cause localized grain coarsening o
Example: Order Quantity and Reorder Point: Daily demand for a particular product manufactured by ABC company is distributed normally with a mean of 30 and standard deviation o
Screw conveyor Screw conveyor during mixing and flow directing paddles are selectively adjustable for use on a wide variety of materials having dissimilar flow characteristics
how will u designate a v belt
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