19. Adhesively bonded joints are strongest under which type of stresses? a. Shea

Question

19. Adhesively bonded joints are strongest under which type of stresses? a. Shear b. Peeling c. Tension d. Cleavage e. Impact f. Fatigue 20. Why are metallic materials better conductors of electricity than polymers and cerami 21. Based on the table given below, which of the following isfare FALSE? Ni can be coated with Fe by a. electroless process Aurtad wealest oedant 01" +4H.p? + 4er ? 24,00 reactant - Agia Agls) b. Fe can be coated with Ni by electroless process c. Ni can be coated with Al by electroless process d. Fe can be coated with Zn by electroless process e. Al can be coated with Ni by electroless process f. Zn can be coated with Fe by electroless process Kia strongest weakest caidant LitiaLis reductant

Explanation / Answer

19. Adhesively bonded joints are strongest under shear and tension type of stresses.

20.   Because the metal are having empty outer valence electron shells which are chemically easily removed from the atoms to become free charge carriers. Thats why metals are good conductors.

Polymer and ceramics have all valence electrons involved in covalent bonds between atoms which can not be removed from the atoms to become charge carriers. so ceramics and polymers are insulators.

21. (a), (c) and (d) are false.

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