Chapter 21 GRINDING and OTHER ABRASIVE PROCESSES

Chapter 21 GRINDING AND OTHER ABRASIVE PROCESSES

Multiple Choice Quiz

There are 27 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.

21.1The abrasive machining processes are generally used as finishing operations: (a) true or (b) false?

21.2Which one of the following conventional machining processes is closest to grinding: (a) drilling, (b) milling, (c) shaping, or (d) turning?

21.3Either the face or the periphery of the grinding wheel can be used for cutting, with face grinding being the more common operation: (a) true or (b) false?

21.4Which one of the following is not one of the five basic parameters of a grinding wheel: (a) abrasive material, (b) bonding material, (c) grain hardness, (d) grain size, (e) wheel grade, or (f) wheel structure?

21.5Friability refers to the capacity of the abrasive material to retain its sharpness during the grinding operation: (a) true or (b) false?

21.6Of the following abrasive materials, which one has the highest hardness: (a) aluminum oxide, (b) cubic boron nitride, or (c) silicon carbide?

21.7Depth of cut in a peripheral grinding operation is called which one of the following: (a) crossfeed, (b) infeed, or (c) penetration?

21.8Smaller grain size in a grinding wheel tends to (a) degrade surface finish, (b) have no effect on surface finish, or (c) improve surface finish?

21.9Which of the following would tend to give higher material removal rates: (a) larger grain size, or (b) smaller grain size?

21.10Which of the following will improve surface finish in grinding (three best answers): (a) denser wheel structure, (b) higher wheel speed, (c) higher workspeeds, (d) larger infeed, (e) lower infeed, (f) lower wheel speed, (g) lower workspeed, and (h) more open wheel structure?

21.11Which one of the following abrasive materials is most appropriate for grinding steel and cast iron: (a) aluminum oxide, (b) cubic boron nitride, (c) diamond, or (d) silicon carbide?

21.12Which one of the following abrasive materials is most appropriate for grinding hardened tool steel: (a) aluminum oxide, (b) cubic boron nitride, (c) diamond, or (d) silicon carbide?

21.13Which one of the following abrasive materials is most appropriate for grinding nonferrous metals: (a) aluminum oxide, (b) cubic boron nitride, (c) diamond, or (d) silicon carbide?

21.14The specific energy in a grinding operation is much greater than the specific energy in a conventional machining operation such as milling: (a) true or (b) false?

21.15Which of the following will help to reduce the incidence of heat damage to the work surface in grinding (four correct answers): (a) frequent dressing or truing of the wheel, (b) higher infeeds, (c) higher wheel speeds, (d) higher workspeeds, (e) lower infeeds, (f) lower wheel speeds, and (g) lower workspeeds?

21.16Which one of the following is the best description of the grinding ratio: (a) rate at which the grinding wheel wears per unit time, (b) ratio of volume of grinding wheel worn relative to the volume of the work material removed, (c) ratio of volume of work material removed relative to the volume of the grinding wheel worn, or (d) ratio of wheel surface speed relative to work surface speed?

21.17Which of the following terms applies to the procedure of sharpening the grinding wheel and restoring the shape of its outside perimeter: (a) dressing or (b) truing?

21.18Which one of the following abrasive processes is capable of achieving the highest production rates: (a) external centerless grinding, (b) internal centerless grinding, (c) external cylindrical grinding, or (d) internal cylindrical grinding?

21.19The term deep grinding refers to which one of the following: (a) alternative name for any creep feed grinding operation, (b) external cylindrical creep feed grinding, (c) grinding operation performed at the bottom of a hole, (d) surface grinding that uses a large crossfeed, or (e) surface grinding that uses a large infeed?

21.20Which one of the following abrasive processes is commonly used to finish the bores of internal combustion engines: (a) honing, (b) lapping, or (c) superfinishing?

21.21Which one of the following abrasive processes is commonly used in the production of glass optical lenses: (a) honing, (b) lapping, or (c) superfinishing?

21.22Which one of the following abrasive processes is capable of achieving the best surface finish: (a) centerless grinding, (b) honing, (c) lapping, or (d) superfinishing?

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