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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 steel tube of 30 mm external diameter and 20mm internal diameter encloses a copper rod of 15mm diameter to which it is rigidly joined at each end. If at a temperature of 10 o C,
Movement of wire at the signal box: The wire working on railway signal is 5mm in diameter and 300m long. If movement at the signal end is to be 25cm, make calculations for mo
Helium Helium (He) is an inert, very light monoatomic gas, of atomic weight of 4. It is obtained by separation from natural gas. Helium is refined to a purity of min. 99.99
Force system: Defin e Non concurrent force system. Why we find the position of Resultant in Non concurrent force system? Sol.: In Equilibrium of concurrent force syste
Creating a new style To create a new dimension style, make sure the STANDARD style is the current style, click in the Name edit box then type the name of the new style you want
CLASSIFICATION OF ELECTRODES The classification system used in the specification AWS A 5.1 which is for carbon steel electrodes follows established pattern for AWS filler metal s
Find velocity of the vehicle: A car having mass 400kg is moving with velocity of 20m/sec. A force of 200N that acts on it for 2 mins. Find velocity of the vehicle: (1) W
Cell-decomposition In cell-decomposition, an object can be represented as the sum of cells into which it can be decomposed. Each cell-decomposition system defines a set of prim
actual division 2km is shown as 1 cm in a map.construct a clean scale to measure km which can travel a distance upto 30 km.Show measurement of 18 km in the scale
Clutch cable model: Ensure the cables fitted are of the respective model and not interchanged with other model. Also ensure that the cable is genuine.
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