Test 1 EM JAN 2021.docx - Test 1 ENGINEERING MATERIALS...

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Test 1ENGINEERING MATERIALSDate: 25/2/2021Time: 10.00 – 12.001.a. Briefly cite the main differences between ionic, covalent, and metallic bonding that determinethe electrical properties and ductility of the materials. Give 1 examples each.[6marks]b. Determine the miller indices for the crystal planes A and B that shown in the cubic unit cellbelow.[4 marks]c.The fact thatreal materials are notperfect crystalsis critical to materialsengineering.Therearesomecrystallinedefects. Mention andexplain 4 typesof defects (providedrawing).[10 marks]d.Name two basic types of dislocations and explain.[5 marks]2.a. Describe 4 (Four) factors that affect fatigue life.[4 marks]b. Microstructure on Figure 1 below shows modes of fracture. Name type of failure (material atFig 1a-Fig1d).[4 marks]
Figure 1:Mode ofmetallic fractures.c. A 6.4 mm diameter cylindrical rod fabricated from a 2014-T6 aluminum alloy (Figure 1) issubjected to reversed tension compression load cycling along its axis. If the maximum tensile

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Term
Winter
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