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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.
Thermit Welding This process utilises the intense heat developed during the reaction between iron oxide and aluminium. When a mixture of three parts of iron oxide and one part
Rockwel l Hardness Test: The specimen is subjected to a major load for about 15 seconds after the initial load. ASTM says 13 scales for testing of wide range of materials. Th
Fixed Support: At such support beam end is not free to translate or rotate at the fixed end there are three reaction horizontal reaction ( R H ), a vertical reaction ( R V ), an
(a) Mention the needs to be satisfied by power transmission system of vehicles. (b) What is an overdrive? Explain its principle of operation and advantages.
Complaints of Engine Starting: If there is a problem related to the starting of the bike, it can be due to mechanical as well as electrical reasons. The possible reasons could be
analyse grublers criterion
Q. Corrosion resistance of the nickel-based alloys? The corrosion resistance of the nickel-based alloys can also be significantly affected by other variables such as velocity a
Motion of two bodies - rough surface and rough pulley: THE HORIZONTAL SURFACE IS ROUGH AND THE STRING IS PASSING OVER ROUGH PULLEY. Figure shows two weights W 1 and W 2 c
Martempering: The piece to be hardened is wholly austenitized and after that quenched in a lead of salt bath held at a temperature simply above at that martensite would begin
Determine the reaction at specific points: A light rod AD can be supported by frictionless pegs at B and C and rests against frictionless wall at A as shown in th
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