Engineering, 20.12.2019 21:31 mazielynn84
From the list below, select four situations in which casting is the preferred fabrication technique.
(1) when mechanical strength is not an important consideration
(2) for economical producing of parts that require very close dimensional tolerances (e. g. bushing and gears)
(3) for large pieces and/or complicated shapes
(4) for alloys having low ductilities
(5) when it is the most economical fabrication technique
(6) for metals having high melting temperatures
Answers: 3
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A3-mm-thick panel of aluminum alloy (k 177 w/m-k, c 875 j/kg-k and ? = 2770 kg/m) is finished on both sides with an epoxy coating that must be cured at or above t,-150°c for at least 5 min. the production line for the curing operation involves two steps: (1) heating in a large oven with air at ts,0-175°c and a convection coefficient of h, 40 w/m2. k, and (2) cooling in a large chamber with air at 25°c and a con- vection coefficient of he 10 w/m2.k. the heating portion of the process is conducted over a time interval te which exceeds the ime required to reach 150°c by 5 min (h = r + 300 s). the coating has an emissivity of ? = 0.8, and the temperatures of the oven and chamber walls are 175 and 25°c, respectively. if the panel is placed in the oven at an initial temperature of 25°c and removed from the chamber at a safe-to-touch tempera ture of 37°c, what is the total elapsed time for the two-step curing operation?
Answers: 3
From the list below, select four situations in which casting is the preferred fabrication technique....
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