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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.
W orking stress and Factor for Safety Working Stress: Working stress is safe stress taken within elastic range of material. For the brittle materials, it is taken equal to
Types of Bridges and their Suitability: Bridging is a specialized filed of engineering science. It has very high degree of sill and expertise in this field, gathered from brid
Q. What is Pre-fabricated buildings? Buildings: Pre-fabricated buildings shall be as per specification GS-904-0520 and, when provided, conceptual drawings prepared by Engine
Basic Troubleshooting of Motorcycle we have studied about the basic troubles in motorcycle operation and their solutions. It will help you in finding out the problem with the vehic
Link O4C of a 4-bar mechanism is subjected to a torque T4=1Nm[ccw]. The link BC is subjected to a force Q=45N @900 downwards. Determine the torque T2 on link O2B and the reactions
Explain the Construction of dc machine The constructional features of a dc machine are given below. A dc machine has two major parts, magnetic ?eld system and armature. The ?eld
ELECTRIC RESISTANCE WELDING Electric resistance welding is an important and widely applied non fusion welding process. This write up covers the basic principles of various resi
Define the components in the STEP standard There are many components in the STEP standard. (i) The first component discusses the purpose of the standard. It contains : (
Determine the radius of curvature - motion of a particle: The motion of a particle in XOY plane is defined by the equation r (t ) = 3t i^ + (4t - 3t 2 ) j^ The distanc
models of CIM
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