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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.
Find out the modulus of elasticity: A unidirectional FRP is produced with fibre volume ratio of 60%. The density of fibre is 1480 kg/m 3 and that of matrix is 1200 kg/m 3 . C
Determine the shear stress in each section - cells: In Figure, the mean dimensions of the two cells are 100 mm × 50 mm and 50 mm square. t 1 = 3 mm, t 2 = 6 mm,
How does the Two Stage Reciprocating Air Compressor works?
Two shafts A and B are co-axial. A gear C (50 teeth) is rigidly mounted on shaft A. A compound gear D-E gears with C and an internal gear G. D has 20 teeth and gears with C and E h
Consider the U-shaped curved beam shown below (with rectangular cross-section and thickness h ), which is loaded by force P as indicated. A free-body diagram reveals that a mome
What is the clear difference between gravitational potential and gravitational potential energy ? Ans) A body A of mass m is placed in the gravitational field of a body B of mass
Improvements Required - Industrial Safety The outlining of association of safety engineering, as done above, with quality, productivity, profit etc. has also tended to make im
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draw the projection of hexagonal prism of base side 20mm & axis length 50mm. when it is lying on the ground on one of its rectangular phase and axis is inclained 35 degree to vp. s
Determine the slopes at free end - cantilever beam: A cantilever beam of length l carries a point load W at a distance l /4 from free end. Determine the slopes at free end
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