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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.
explain ways of representing alternative quantities;1)phasor representation 2)graphical representation 3)complex waves 4)addition and subtraction of sine wave
SPOT WELDING In this type of welding, after proper cleaning of the surfaces, the metals to be welded are kept one above the other and two copper electrodes are kept on both sid
Beam: What do you mean by Beam, and Shear force and bending moment diagrams? Sol.: A beam is structural member whose longitudinal dimensions (that is width) is large co
Determine number of coils and length of the spring: A close coiled helical spring ought to extend by 120 mm under an axial force of 1200 N. If mean coil radius is equal to 40
Compute the position and magnitude of the resultant force acting on the framework shown below. What is the moment of the force system ?
Compute the displacement of the particle: The acceleration time diagram for particle is as specified below .Computed velocity of the particle at several time intervals, plot v
Scalar and Vector quantities: A quantity is a scalar if it is completely defined by its magnitude alone. For example: Length, area, and time. While quantity is said to be vect
A uniform air stream with velocity U = 10m/s flows over a flat plate of length 10 meters in the first meter the boundary layer is laminar but beyond this point boundary layer is fu
explain working and construction of locomotive boilers
Q. Briefly explain Model scale design? Knowledge of dynamic similarity conditions enables evaluation of model scales. Almost alI the problems related to river hydraulics are ab
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