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An elastomer is a polymeric substance obtained after vulcanization of rubber. Vulcanization is the process of improving the properties of rubber by heating with sulphur. A normal rubber is not useable as it becomes brittle at low temperature and sticky at high temperature. Charles Goodyear had been trying to 'cure' the rubber so that it could be used in all seasons. He tried to mix all kinds of things such as ink, black pepper, cheese and what not. But he couldn't succeed until he dropped a piece of rubber on stove accidentally.
To his surprise, he found that instead of melting the rubber piece hardened and remained pliable. It was found in the lab that it contained traces of sulphur. Goodyear perfected the process and named it 'vulcanization' after the Roman God of fire, 'Vulcan'.
Explain the Selected Bridges - Underwater Inspection? Those bridges, which require underwater inspection must be noted for individual inspection and inventory records as well b
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Quality Control in Flexible Pavements: The quality control needed for Flexible Pavements covers the following tests : (a) Density and Moisture content of sub-grade. (b)
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Explain the Coordinate System 1. A Benchmark provides only elevation data. 2. Coordinate System provides northing and easting coordinates within a defined system. 3. Coor
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The covers of electrical machines are made of what materials ? Answer: It is made of soft magnetic materials.
Determine the moment of inertia with respect to the x axis for the shaded area shown (Figure 2) . The dimension is a = 2.00m .
Write the principle of reversibility of light.
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