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16 Cards in this Set
- Front
- Back
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11.1 Which one of the following casting processes is the most widely used: (a) centrifugal casting, (b) diecasting, (c) investment casting, (d) sand casting, or (e) shell casting? |
Answer. (d). |
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11.2 In sand casting, the volumetric size of the pattern is (a) bigger than, (b) same size as, or (c) smallerthan the cast part? |
Answer. (a). |
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11.3 Silica sand has which one of the following compositions: (a) Al2O3, (b) SiO, (c) SiO2, or (d) SiSO4? |
Answer. (c). |
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11.4 For which one of the following reasons is a green mold named: (a) green is the color of the mold, (b)moisture is contained in the mold, (c) mold is cured, or (d) mold is dry? |
Answer. (b). |
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11.5 Given that Wm = weight of the molten metal displaced by a core and Wc = weight of the core, thebuoyancy force is which one of the following: (a) downward force = Wm + Wc, (b) downward force =Wm - Wc, (c) upward force = Wm + Wc, or (d) upward force = Wm - Wc? |
Answer. (d). |
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11.6 Which of the following casting processes are expendable mold operations (four correct answers): (a)centrifugal casting, (b) die casting, (c) investment casting, (d) low pressure casting, (e) sand casting,(f) shell molding, (g) slush casting, and (h) vacuum molding? |
Answer. (c), (e), (f), and (h). |
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11.7 Shell molding is best described by which one of the following: (a) casting operation in which themolten metal has been poured out after a thin shell has been solidified in the mold, (b) castingprocess in which the mold is a thin shell of sand bonded by a thermosetting resin, (c) sand-castingoperation in which the pattern is a shell rather than a solid form, or (d) casting operation used tomake artificial sea shells? |
Answer. (b). |
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11.8 Investment casting is also known by which one of the following names: (a) fast-payback molding,(b) full-mold process, (c) lost-foam process, (d) lost-pattern process, or (e) lost-wax process? |
Answer. (e). |
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11.9 In plaster mold casting, the mold is made of which one of the following materials: (a) Al2O3, (b)CaSO4-H2O, (c) SiC, or (d) SiO2? |
Answer. (b). |
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11.10 Which of the following qualifies as a precision-casting process (two correct answers): (a) ingotcasting, (b) investment casting, (c) plaster-mold casting, (d) sand casting, and (e) shell molding? |
Answer. (b) and (c). |
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11.11 Which of the following casting processes are permanent mold operations (three correct answers): (a)centrifugal casting, (b) die casting, (c) expanded polystyrene process, (d) sand casting, (e) shellmolding, (f) slush casting, and (g) vacuum molding. |
Answer. (a), (b), and (f). |
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11.12 Which of the following metals would typically be used in die casting (three best answers): (a)aluminum, (b) cast iron, (c) steel, (d) tin, (e) tungsten, and (f) zinc? |
Answer. (a), (d), and (f). |
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11.13 Which of the following are advantages of die casting over sand casting (four best answers): (a) bettersurface finish, (b) closer tolerances, (c) higher melting temperature metals, (d) higher productionrates, (e) larger parts can be cast, and (f) mold can be reused? |
Answer. (a), (b), (d), and (f). |
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11.14 Cupolas are furnaces used to melt which of the following metals (one best answer): (a) aluminum,(b) cast iron, (c) steel, or (d) zinc? |
Answer. (b). |
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11.15 A misrun is which one of the following defects in casting: (a) globules of metal becoming entrappedin the casting, (b) metal is not properly poured into the downsprue, (c) metal solidifies before fillingthe cavity, (d) microporosity, and (e) "pipe" formation? |
Answer. (c). |
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11.16 Which one of the following casting metals is most important commercially: (a) aluminum and itsalloys, (b) bronze, (c) cast iron, (d) cast steel, or (e) zinc alloys? |
Answer. (c). |
