Backflow prevention devices should be located
a. at the end of the irrigation system.
b. between the water source and the first valve.
c. between the first valve and second valve.
d. below the lowest irrigation head.
b. between the water source and the first valve.
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The variable resistor R in the circuit of Fig. 11.50 is adjusted until it absorbs the maximum average power. Find R and the maximum average power absorbed.
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Reflectivity, or albedo, is measured ____.
A. as a decimal between 0 and 1 B. as a rank between 0 (low reflectivity) and 100 (high reflectivity) C. as a rank between 0 (low reflectivity) and 10 (high reflectivity) D. on a sliding scale from no reflectivity to very high reflectivity
Which of the following is not a true statement regarding the requirement for grounding of equipment?
A. When within 8 ft (2.5 m) vertically or 5 ft (1.5 m) horizontally of ground or grounded metal objects and subject to contact by persons B. When in a hazardous (classified) location as covered by Articles 500 through 517 C.When supplied by a metal-clad, metal-sheathed, metal-raceway, or other wiring method that provides an equipment ground D. When equipment operates with any terminal at over 50 volts to ground
Common symbols used on blueprints are usually based on the symbols developed by the __________.
a. National Fire Protection Association b. National Electrical Code® c. National Association of Electrical Manufacturers d. American National Standards Institute