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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.
Types of stresses: In general stress is divided in to three group as: various types of stresses may be classified as: 1. Simple or direct stress (Tension, Compressi
TWO WHEELER INDUSTRY GROWTH: In world represents one of the largest two wheeler markets in the world with an estimated size of 5.4 million units a year. Two wheelers are used ext
Compressio n Ignition Engines (or C.I. Engine): It works on the basis of dieses cycle. In diesel engines, energy addition occurs at constant pressure but energy rejection at
Illustrate the Explanation of NC Machine Tools? Numerical control (NC) is considered to be an improved control for machine tools that provides higher productivity. Today indust
Q. Use of high temperature materials in Furnaces? Often, furnace tubing and refractory protected membrane walls are fabricated from plain carbon steel with a minimum of 0.25% c
design the bucket elevator
How is angle of dispersion used in footing? Angle of Dispersion Indian Standards (IS) has specified relation for determining the angle, of dispersion. According to IS the an
Drynes s Fraction of Steam: Dryness fraction of steam is factor which used to specify the quality of steam. It can be defined as the ratio of weight of dry steam W d s pr
Design a shaft to transmit power from a motor to a lathe head stock through a pulley by means of a belt drive. The pulley weighs 200 N and is located at 300 mm from the centre of t
Differentiate Reaction turbine and Impulse turbine (steam turbines) (b) In a De Laval turbine, steam issue from the nozzle with a velocity of 850 m/s. The nozzle angle is 20 o C
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