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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.
an elctric current is passed through a wire 1mm in diameter and 10mm long. the wire is submerged in liquid water at atmospheric pressure and current is increased until the water bo
Calculate Additional force required to maintain equilibrium: Fo r the system shown in figure find the additional single force required to maintain equilibrium. Sol.: L
Q. Explain about Vertical Vessels? Vertical vessels shall normally be designed as self-supporting units, and shall resist overturn based upon wind or earthquake considerations.
Determine Maximum fibre stress: A beam of rectangular section of 80 mm to 120 mm carries a uniformly distributed load of 40 kN/m over a span of 2 m an axial compressive force
A competitor in a hill-climb event finds during practice that his car becomes airborne at a particular point on the hill. Shortly after landing the lowest point in the car just co
An experiment to determine the convection coefficient associated with airflow over the surface of a thick stainless steel casting involves insertion of thermocouples in the casting
Find out the product of inertia of a rectangular area: Find out the product of inertia of a rectangular area b × d with respect to its sides as illustrated in Figure Solut
Use of Auger extension for extended screed An improved extended auger arrangement and an improved asphalt paver with a tractor unit and a screed assembly including a main scree
Connecting Rod : It connects the piston and the crankshaft and transmits the power from the piston to the crankshaft. It has a small end (through which gudgeon pin passes to conne
Q. What is MAPP Gas Welding? Methyl acetylene-propadiene-petroleum (M inert than other gas mixtures, making it safer for use and store. MAPP can also be used at very h high-vol
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