ME 383 Test 1_Metal Casting Processes
In sand casting, the volumetric size of the pattern is which of the following relative to the cast part? (a) bigger, (b) same size, or (c) smaller.
Answer. (a)
Cupolas are furnaces used to melt which of the following metals (choose one best answer)? (a) aluminum, (b) cast iron, (c) steel, or (d) zinc.
Answer. (b)
For which of the following reasons is a green mold so- 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)
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)
Which of the following qualifies as a precision casting process (more than one)? (a) ingot casting, (b) investment casting, (c) plaster mold casting, (d) sand casting, and (c) shell molding.
Answer. (b) and (c).
A misrun is which one of the following defects in casting? (a) globules of metal becoming entrapped in the casting, (b) metal is not properly poured into the downsprue, (c) metal solidifies before filling the cavity, (d) microporosity, and (e) "pipe" formation.
Answer. (c)
Shell molding is which one of the following? (a) casting operation in which the molten metal has been poured out after a thin shell has been solidified in the mold, (b) casting operation used to make artificial sea shells, (c) casting process in which the mold is a thin shell of sand binded by a thermosetting resin, or (d) sand casting operation in which the pattern is a shell rather than a solid form.
Answer. (c)
Silica sand has which one of the following compositions? (a) Al2O3, (b) SiO, (c) SiO2, or (d) SiSO4.
Answer. (c)
Whichoneofthefollowingcastingmetalsismostimportantcommercially?(a)aluminumandits alloys, (b) bronze, (c) cast iron, (d) cast steel, or (e) zinc alloys.
Answer. (c)
Given that Wm = weight of the molten metal displaced by a core and Wc = weight of the core, the buoyancy 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)
Which one of the following casting processes is most widely used (one answer)? (a) centrifugal casting, (b) die casting, (c) investment casting, (d) sand casting, or (e) shell casting.
Answer. (d)
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)
