Which of the following fibers is likely to have the highest strength? -E-glass -

Question

Which of the following fibers is likely to have the highest strength? -E-glass -S-glass -Kevlar -Nylon -Which of the following fibers is likely to have the highest modulus? -Kevlar -S-glass -E-glass -Carbon -Nylon -Which of the following processes is suitable for producing porous metallic filters? -Forging -Casting -transfer molding -powder processing -Extrusion -The screw-barrel system is used to -strain harden advanced aerospace superalloys. -make beer, of course -increase the degree of crystallinity in a glass ceramic -increase the the degree of sintering in glass parts -achieve melting of thermoplastic pellets for further shaping -cure the thermoset parts in order to achieve a high degree of crosslinking -increase the melt viscosity of thermosets so as enable proper curing in the part -decrease the liquidus temperature of powders so that they can densified to a high percentage

Explanation / Answer

20)Kevlar has highest strength due to inter-molecular bonds between carbonyl groups and NH centres

21)Kevlar has highest youngs modulus

22)Transfer molding

23)to achieve melting of thermoplastic pellets for further shaping

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