CH 17 Multiple Choice Q's

17.17 Which one of the following cutting conditions has the strongest effect on cutting temperature: (a) cutting speed, (b) depth of cut, or (b) feed?

cutting speed

17.12 Which one of the four types of chip would be expected in a turning operation conducted at low cutting speed on a brittle work material: (a) continuous, (b) continuous with built-up edge, (c) discontinuous, or (d) serrated?

discontinuous

17.3 Which of the following are the three most common machining operations: (a) broaching, (b) drilling, (c) lapping, (d) milling, (e) planing, (f) shaping, or (g) turning?

drilling, milling, turning

17.6 With which one of the following geometric forms is the turning operation most closely associated: (a) external cylinder, (b) flat plane, (c) round hole, (d) screw threads, or (e) sphere?

external cylinder

17.14 In using the orthogonal cutting model to approximate a turning operation, the chip thickness before the 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?

feed

17.4 Machining is noted for which of the following characteristics relative to other manufacturing processes: (a) creates three-dimensional geometries, (b) good dimensional accuracy, (c) net shape process, (d) poor surface finish, (e) wasteful of energy, (f) wasteful of material?

good dimensional accuracy, wasteful of material

17.8 A roughing operation generally involves which one of the following combinations of cutting conditions: (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 of cut?

low v, high f and d

17.2 Which of the following manufacturing processes are classified as material removal processes: (a) casting, (b) drawing, (c) extrusion, (d) forging, (e) grinding, (f) machining, (g) molding, (h) pressworking, and (i) spinning?

machining, grinding

17.5 A lathe is used to perform which one of the following manufacturing operations: (a) broaching, (b) drilling, (c) lapping, (d) milling, or (e) turning?

turning

17.11 The chip thickness ratio in orthogonal cutting is which one of the following: (a) tc/to, (b) to/tc, (c) to/w, where tc = chip thickness after the cut, to = chip thickness before the cut, and w = width of cut?

to/tc to: thickness before chip deformation tc: thickness after chip deformation

17.7 A single-point cutting tool is used for which one of the following operations: (a) drilling, (b) milling, or (c) turning?

turning

17.13 According to the Merchant equation, an increase in rake angle would have which of the following results, 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 cutting temperature, and (e) increase in shear plane angle?

- decrease in power requirements - increase in shear plane angle

17.9 Which of the following are characteristics of the orthogonal cutting model: (a) a circular cutting edge is used, (b) a multiple-cutting-edge tool is used, (c) a single-point tool is used, (d) only two dimensions play an active role in the analysis, (e) the cutting edge is parallel to the 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 angle and relief angle?

- only two dimensions play an active role in the analysis - the cutting edge is perpendicular to the direction of cutting speed - the two elements of tool geometry are rake angle and relief (clearance) angle.

For which one of the following values of chip thickness before the cut to would you expect the specific energy in machining to be the greatest: (a) 0.010 inch, (b) 0.025 inch, (c) 0.12 mm, or (d) 0.50 mm?

0.12mm

17.15 Specific energy in metal machining is a measure of the amount of energy required to remove a unit volume of material: (a) true or (b) false?

True

17.1 The material removal processes are a family of shaping operations in which excess material is removed from a starting work part so that what remains is the desired final geometry: (a) true or (b) false?

True

Which one of the following metals would usually have the lowest unit horsepower in a machining operation: (a) aluminum, (b) brass, (c) cast iron, or (d) steel?

aluminium

17.16 Which one of the following metals would usually have the lowest specific energy in a machining operation: (a) aluminum, (b) brass, (c) cast iron, or (d) steel?

aluminum

17.10 The mechanism of chip formation in machining is best described by which one of the following: (a) compression, (b) fracture failure, (c) shear deformation, or (d) tensile failure?

shear deformation