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Department
Engineering
Course
ENG 2002
Professor
Xue Qing Xu
Semester
Summer

Description
ENG2000 Test on Atoms and Crystals 30 September 2003 1. [50] a. What characteristics define a crystal and why are crystals useful in engineering applications? [6] b. Define the atomic packing factor (APF). Calculate the APF for the face- centred cubic and the body-centred cubic crystal structures. [10] c. For a cubic system, write down the indices of the individual members of the <100> family of lattice directions and sketch them. [10] d. For a cubic crystal structure, sketch the (1 1 1), (2 3 4) and (3 2 1) planes. [12] e. Determine which planes of the face-centred cubic structure have the highest density of atoms and calculate this value for copper (aCu 0.361nm). Hint, the answer is in units of atomsnm . [12] 2. [50] a. Draw labelled diagrams to illustrate
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