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What are the principal methods used to produce metallic powders?
Define bulk density and true density for metallic powders.
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How would one measure the angle of repose for a given amount of metallic powder?
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What is meant by the term aspect ratio for a metallic particle?
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What is the difference between open pores and closed pores in a metallic powders?
In the screening of powders for sizing, what is meant by the term mesh count?
What are some of the disadvantages of PM methods?
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Name some of the reasons for the commercial importance of powder metallurgy technology.
There are 14 correct answers in the following multiple choice questions (some questions have multiple answers that are correct). To attain 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, and each additional answer beyond the correct number of answers reduces the score by 1 point. Percentage score on the quiz is based on the total number of correct answers
\r\n15.1 Which one of the following is the most common polymer type in fiber-reinforced polymer composites: (a) elastomers, (b) thermoplastics, or (c) thermosets?
\r\n15.2 Most rubber products are properly classified into which of the following categories (three best answers): (a) elastomer reinforced with carbon black, (b) fiber-reinforced composite, (c) particle-reinforced composite, (d) polymer matrix composite, (e) pure elastomer, and (f) pure polymer?
\r\n15.3 Other names for open mold processes include which of the following (two best answers): (a) compression molding, (b) contact lamination, (c) contact molding, (d) filament winding, (e) matched die molding, (f) preform molding, and (g) pultrusion?
\r\n15.4 Hand lay-up is classified in which of the following general categories of PMC shaping processes (two best answers): (a) closed mold process, (b) compression molding, (c) contact molding, (d) filament winding, or (e) open mold process?
\r\n15.5 A positive mold with a smooth surface will produce a good finish on which surface of the laminated product in the hand lay-up method: (a) inside surface or (b) outside surface?
\r\n15.6 A molding operation that uses sheet-molding compound (SMC) is a form of which one of the following: (a) compression molding, (b) contact molding, (c) injection molding, (d) open mold processing, (e) pultrusion, or (f) transfer molding?
\r\n15.7 Filament winding involves the use of which one of the following fiber reinforcements: (a) continuous filaments, (b) fabrics, (c) mats, (d) prepregs, (e) short fibers, or (f) woven rovings?
\r\n15.8 In filament winding, when the continuous filament is wound around the cylindrical mandrel at a helix angle close to 90°, it is called which of the following (one best answer): (a) bi-axial winding, (b) helical winding, (c) hoop winding, (d) perpendicular winding, (e) polar winding, or (f) radial winding?
\r\n15.9 Pultrusion is most similar to which one of the following plastic shaping processes: (a) blow-molding, (b) extrusion, (c) injection molding, or (d) thermoforming?
\r\n15.10 Water jet cutting is one of several ways of cutting or trimming uncured or cured FRPs; in the case of cured FRPs, the process is noted for its reduction of dust and noise: (a) true or (b) false?
What are the advantages and disadvantages of using prepreg material for lay-up of composites according to the composite video?
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List the primary methods of fiber reinforced thermoset polymer composite production according to the composite video.
According to the video on composites, list the primary purpose of the matrix and the reinforcement in a composite.
How are FRPs cut?
With what kinds of products is tube rolling associated?
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How does pulforming differ from pultrusion?
Describe the pultrusion process
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What is filament winding?
Describe reinforced reaction injection molding (RRIM)
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What is preform molding?
Identify some of the different forms of polymer matrix composite molding compounds
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What are some of the advantages of the closed mold processes for PMCs relative to open mold processes?
What is an autoclave
What is the difference between the wet lay-up approach and the prepreg approach in hand lay-up?
Why are laminated FRP products made by the spray-up method not as strong as similar products made by hand lay-up?
How is a prepreg different from a molding compound?
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