What is accomplished by having a compressor that is equipped with unloaders?
What will be an ideal response?
The compressor is able to operate at different capacities in order to save energy and reduce the operating compression ratio of the system.
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As crop residue breaks down, it competes with a growing crop for soil ____; therefore, extra ____ may
be needed to assure good crop yields.
a. hydrogen c. nitrogen b. carbon dioxide d. oxygen
Compute the surface area of a sphere with a 2.120-meter diameter rounded to 4 significant digits.
Fill in the blank(s) with the appropriate word(s).
An international aerospace contractor has been asked by a municipal police department to estimate and analyze the life cycle costs for a proposed drone surveillance system to monitor traffic patterns and congestion within the central thoroughfares of the city. The list of items include the following general categories: R&D costs (R&D), nonrecurring investment costs (NRI), recurring investment costs (RI), scheduled and unscheduled maintenance costs (Maint), equipment usage costs (Equip), and disposal costs (Disp). The costs (in $ million units) for the 20-year life cycle have been estimated. Calculate the annual LCC at an interest rate of 7% per year.
What will be an ideal response?
Aluminum-faced forms are unsuitable for architectural-concrete applications because they _____
a. react chemically with concrete b. are difficult to erect c. are not sufficiently strong d. are available only in small sizes