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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.
Generation of steam at constant pressure: Steam is pure substance. Like any other pure substance it can also be converted into any of the three states, that is, solid, liquid
Forces working on sphere: Let a sphere of mass m, suspended by means of a string, resting against a smooth wall, as illustrated in Figure (a). What are the forces working on i
#tool life formular for diferent n values
A machine of mass one tonne is acted upon by an external force of 3000 N at a frequency of 1500 rpm. To reduce the effects of vibration, isolator of rubber having a static deflecti
EXPLOSIVE WELDING I CLADDING In this process, two pieces of metal are impacted together at an extremely high velocity of impact achieved by the detonation of an explosive cha
Find out nature of position vector: The position vector of a specific at any instant t with respect to the axes x, y and z is specified by r (t ) = (4 t 2 + 5) i¯ + (3 t
Overhead Bridge Crane Figure below shows a jib crane. In this type of crane the hook can move in a circular path. A jib crane is preferred where lifting of the jobs is requ
Use roller support - steel trusses of bridges: Explain, why do we use roller support in case of steel trusses of bridges? Sol. : In the bridges most of time external f
explain
Fifth Service and Sixth Service Following extra mandatory checks are required during the fifth service of a 125 cc motorcycle : Inspect engine oil and top up as re
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