© Mikell P. Groover 2012
Chapter 17 FUNDAMENTALS OF METAL FORMING
Multiple Choice Quiz
There are 16 correct answers in this multiple choice quiz (some questions have multiple answers that are correct). To achieve a perfect score on the quiz, all correct answers must be given. Each correct answer is worth 1 point. Each omitted answer or wrong answer reduces the score by 1 point. Percentage score on the quiz is based on the total number of correct answers.
17.1Stresses applied in most metal forming operations are which one of the following: (a) compressive, (b) shear, or (c) tensile?
17.2Which of the following are desirable properties of the work material in metal forming (twobest answers): (a) high ductility, (b) high tensile strength, (c) high yield strength, (d) low ductility, (e) low tensile strength, and (f) low yield strength?
17.3Which of the following are bulk deformation processes (three correct answers): (a) bending, (b) deep drawing, (c) extrusion, (d) forging, (e) rolling, and (f) shearing?
17.4Which of the following is typical of the starting work geometry in sheet metal processes: (a) high volumetoarea ratio or (b) low volumetoarea ratio?
17.5The flow curve expresses the behavior of a metal in which of the following regions of the stressstrain curve: (a) elastic region or (b) plastic region?
17.6The average flow stress is the flow stress multiplied by which of the following factors: (a) n, (b) (1+n), (c) 1/n, or (d) 1/(1+n), where n is the strain-hardening exponent?
17.7Hot working of metals refers to which one of the following temperature regions relative to the melting point of the given metal: (a) room temperature, (b) 0.2Tm, (c) 0.4Tm, or (d) 0.6Tm, where Tm = the melting temperature on an absolute temperature scale?
17.8Which of the following are advantages and characteristics of hot working relative to cold working (four correct answers): (a) fracture of workpart is less likely, (b) friction is reduced, (c) increased strength properties, (d) isotropic mechanical properties, (e) less overall energy is required, (f) lower deformation forces are required, (g) more significant shape changes are possible, and (h) strain-rate sensitivity is reduced?
17.9Increasing strain rate tends to have which one of the following effects on flow stress during hot forming of metal: (a) decreases flow stress, (b) has no effect, or (c) increases flow stress?
17.10The coefficient of friction between the part and the tool in cold working tends to be (a) higher, (b) lower, or (c) no different relative to its value in hot working?
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