Exposed runs of Type AC cable installed on the underside of joists must be supported at ____.
A. every joist
B. alternate joists
C. every junction
D. alternate junctions
Answer: A
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Sound transmission class (STC) is a measure of the
A) sound-insulating property of a material with respect to airborne sound. B) sound-insulating property of a material with respect to structure-borne sound. C) sound-reflecting property of a material. D) sound-absorbing property of a material.
Assume the MARR is 10% per year for this analysis. A presently owned machine that was purchased 8 years ago for $450,000 is under consideration for replacement. It has an annual operating cost of $120,000 per year and a salvage value of $40,000 whenever it is replaced. The challenger has a first cost of $670,000, an expected annual operating cost of $94,000, and a salvage value of $60,000 after its 10-year economic life. The breakeven market value of the presently owned machine required to make the AW values of the two machines the same, if the presently owned machine is kept for 5 more years and then replaced with the challenger that has the same AW, is closest to: (choose one)
(a) $196,340 (b) $255,390 (c) $325,360 (d ) $394,770
Every impervious surface on a site increases the required capacity of municipal storm water systems ____.
A. and absorbs contaminants B. yet prevents contaminants such as oil, gasoline, insecticides and fertilizers from running into waterways C. and allows contaminants such as oil, gasoline, insecticides and fertilizers to run into waterways D. and creates contaminants
ACR tubing is cleaned, degreased, dehydrated, and sealed to keep its:
A) Insides clean. B) Bright shine. C) Nitrogen base high. D) Aesthetic appeal.