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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) Describe that internal energy is property of the system. (b) one kg of air at 1 bar and 300k is compressed adiabatically till its pressure becomes 5 times the original press
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define elastomer.explain in details?
Explain the Intensive Properties of a System Intensive properties are those, which have similar value for any part of the system or the properties which are independent of the
#question calculate bending force
Compute the position and magnitude of the resultant force acting on the framework shown below. What is the moment of the force system ?
(a) Derive a mathematical expression for the efficiency of a dual cycle. (b) An oil Engine working on a dual combustion cycle has a compression ratio 10 and cut-off takes place
WHAT IS DIFFERENCE BETWEEN POROSITY AND BLOW HOLE
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Magnitude of a couple: So l.: For system, magnitude of couple is equal to algebraic sum of the moment about any point If the system reduces to couple, the resultant forc
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