© Mikell P. Groover 2013
Chapter 20 ECONOMIC AND PRODUCT DESIGN CONSIDERATIONS
Multiple Choice Quiz
There are 19 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.
20.1Which of the following criteria are generally recognized to indicate good machinability (four best answers): (a) ease of chip disposal, (b) good surface finish, (c) high cutting temperatures, (d) high power requirements, (e) long tool life, (f) low cutting forces, and (g) zero shear plane angle?
20.2Of the various methods for testing machinability, which one of the following is the most important: (a) cutting forces, (b) cutting temperature, (c) horsepower consumed in the operation, (d) surface roughness, (e) tool life, or (f) tool wear?
20.3A machinability rating greater than 1.0 indicates that the work material is (a) easier to machine than the base metal or (b) more difficult to machine than the base metal, where the base metal has a rating = 1.0?
20.4In general, which one of the following materials has the highest machinability: (a) aluminum, (b) cast iron, (c) copper, (d) low carbon steel, (e) stainless steel, (f) titanium alloys, or (g) unhardened tool steel?
20.5Which one of the following operations is generally capable of the closest tolerances: (a) broaching, (b) drilling, (c) end milling, (d) planing, or (e) sawing?
20.6Which of the following are geometric factors in a machining operation that determine the surface geometry of the work part (three best answers): (a) cutting speed, (b) depth of cut, (c) ductility of the work material, (d) feed, (e) nose radius on the tool, and (f) type of machining operation?
20.7The actual surface roughness Ra almost always has a lower value than the ideal surface roughness Ri: (a) true or (b) false?
20.8When cutting a ductile work material, an increase in cutting speed will generally (a) degrade surface finish, which means a higher value of Ra or (b) improve surface finish, which means a lower value of Ra?
20.9Which one of the following operations is generally capable of the best surface finishes, which meansthe lowest value of Ra: (a) broaching, (b) drilling, (c) end milling, (d) planing, or (e) turning?
20.10When selecting the appropriate cutting conditions for a given machining operation, which of the following parameters should be selected before the other: (a) cutting speed or (b) feed?
20.11Which of the following time components in the average production machining cycle is affected by cutting speed (two correct answers): (a) average tool change time per piece, (b) part loading and unloading time, (c) setup time for the machine tool, and (d) time the tool is engaged in cutting?
20.12Which cutting speed is always lower for a given machining operation: (a) cutting speed for maximum production rate, or (b) cutting speed for minimum cost?
20.13A high tooling cost and/or tool change time will tend to (a) decrease, (b) have no effect on, or (c) increase the cutting speed for minimum cost?
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