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13 Cards in this Set
- Front
- Back
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21.1 Which of the following manufacturing processes are classified as material removal processes (twocorrect answers): (a) casting, (b) drawing, (c) extrusion, (d) forging, (e) grinding, (f) machining, (g)molding, (h) pressworking, and (i) spinning? |
Answer. (e) and (f). |
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21.2 A lathe is used to perform which one of the following manufacturing operations: (a) broaching, (b)drilling, (c) lapping, (d) milling, or (e) turning? |
Answer. (e). |
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21.3 With which one of the following geometric forms is the drilling operation most closely associated:(a) external cylinder, (b) flat plane, (c) round hole, (d) screw threads, or (e) sphere? |
Answer. (c). |
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21.4 If the cutting conditions in a turning operation are cutting speed = 300 ft/min, feed = 0.010 in/rev,and depth of cut = 0.100 inch, which one of the following is the material removal rate: (a) 0.025in3/min, (b) 0.3 in3/min, (c) 3.0 in3/min, or (d) 3.6 in3/min? |
Answer. (d). |
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21.5 A roughing operation generally involves which one of the following combinations of cuttingconditions: (a) high v, f, and d; (b) high v, low f and d; (c) low v, high f and d; or (d) low v, f, and d,where v = cutting speed, f = feed, and d = depth? |
Answer. (c). |
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21.6 Which of the following are characteristics of the orthogonal cutting model (three best answers): (a)a circular cutting edge is used, (b) a multiple-cutting-edge tool is used, (c) a single-point tool isused, (d) only two dimensions play an active role in the analysis, (e) the cutting edge is parallel tothe direction of cutting speed, (f) the cutting edge is perpendicular to the direction of cutting speed,and (g) the two elements of tool geometry are rake and relief angle? |
Answer. (d), (f), and (g). |
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21.7 The chip thickness ratio is which one of the following: (a) tc/to, (b) to/tc, (c) f/d, or (d) to/w, where tc =chip thickness after the cut, to = chip thickness before the cut, f = feed, d = depth, and w = width ofcut? |
Answer. (b). |
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21.8 Which one of the four types of chip would be expected in a turning operation conducted at lowcutting speed on a brittle work material: (a) continuous, (b) continuous with built-up edge, (c)discontinuous, or (d) serrated? |
Answer. (c). |
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21.9 According to the Merchant equation, an increase in rake angle would have which of the followingresults, all other factors remaining the same (two best answers): (a) decrease in friction angle, (b)decrease in power requirements, (c) decrease in shear plane angle, (d) increase in cuttingtemperature, and (e) increase in shear plane angle? |
Answer. (b) and (e). |
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21.10 In using the orthogonal cutting model to approximate a turning operation, the chip thickness beforethe cut to corresponds to which one of the following cutting conditions in turning: (a) depth of cut d,(b) feed f, or (c) speed v? |
Answer. (b). |
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21.11 Which one of the following metals would usually have the lowest unit horsepower in a machiningoperation: (a) aluminum, (b) brass, (c) cast iron, or (d) steel? |
Answer. (a). |
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21.12 For which one of the following values of chip thickness before the cut to would you expect thespecific energy in machining to be the greatest: (a) 0.010 inch, (b) 0.025 inch, (c) 0.12 mm, or (d)0.50 mm? |
Answer. (c). |
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21.13 Which of the following cutting conditions has the strongest effect on cutting temperature: (a) feedor (b) speed? |
Answer. (b). |
