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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.
Projection Welding Projection welding is similar to spot welding but for the fact that the welding takes place at the projections on the surface of the metals and flat shaped e
In a 15 TR ammonia refrigerator plant the condensing temperature is 25 0 C and the evaporative temperature is -10 0 C. The refrigerant ammonia is subcooled by 50C before passing th
what are the necessity of lubrication ?
Evaluation of heat Required: Heat which is required to generate steam is different from 'total heat' or enthalpy of steam. Heat required for generating steam means heat needed
Q. Application of hot service insulation? Provision for the expansion of hot equipment shall include the installation of expansion springs in circumferential banding securing i
A converging elbow (see Figure 4) turns water through an angle of 135 o in a vertical plane. The flow cross-section diameter is 400 mm at the elbow inlet, section (1), and 200 mm
Continuous Furnace: Parts to be treated are situated on several sort of conveyor that move into the furnaces as per to programmed heating cooling cycle. The time for unloadin
Consider a particle and its path of travel.The position of a particle P at any time t can be described by specifying its: (a)Rectangular coordinates; X,Y,Z (b)Cylindrical coordinat
pin shift return spring : Check pin shift return spring for proper torque.
why 4R kinematic chain do not form different mechanisms?
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