QUESTION: Which scenario illustrates a tolerance stack in the part design?
POSSIBLE ANSWERS:
Operator inexperience with maintaining tool offsets allows the machining to vary widely from
the specifications set forth in a part blueprint, resulting in an unusable part.
Due to a damaged tool, the cutting of a metal part did not meet the tolerance specification set
forth in a blueprint, resulting in a scrapped part.
By chance, the machining of a part met the tolerance specifications set forth in a blueprint, but
a
the accumulation of variation from the upper or lower limits of the tolerance results in an unusable
part.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

The filament of an incandescent lamp has a temperature of 2000k. calculate the fraction of radiation emitted in the visible light band if the filament is approximated as blackbody

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?