Why is the thickness of a section fixed when it touches a solid object such as the walls of the cavity or the plug?
What will be an ideal response?
The thinning process is a movement of material due to stretching. When the movement stops so does the stretching. Expansion of the material into a mold may attempt to draw material that is touching a solid object, but the resistance to movement of that material is much higher than the resistance of free material, so the free material moves and therefore stretches.
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When assembling a longer lattice boom, which condition should assembly workers avoid?
a. Using spreader bars on boom pendants b. Inserting upper connector pins between sections to be assembled c. Assembling the boom base section first d. Exceeding the maximum boom cantilever length
The injection fluid used in hydrofracking consists of ____
a. aerobic bacteria and water c. chemicals, sand, and water b. fertilizer and water d. water only
Receptacle boxes are placed 12 feet apart. Holes are drilled in the wall studs 1 foot above the boxes to permit Romex wire to be run between them. Each receptacle box is 3 inches deep, and 6 inches of wire extends beyond the edge of a box. How many receptacle boxes can be wired with one box of Romex wire? (Note: A box of Romex wire contains 250 feet.)
Fill in the blank(s) with the appropriate word(s).
The structural design of precast concrete curtain wall panels is generally the responsibility of the
A) structural engineer specially retained by the owner. B) structural engineer retained by the panel fabricator. C) structural engineer, who designs the structural frame of the building in which the panels are to be used. D) structural engineer retained by the general contractor of the building. E) none of the above.