Explain why subpanels are often used in residential services.
What will be an ideal response?
To eliminate the need for long circuit runs from the main service panel to the various loads of the system.
To provide for the installation of more circuits than the main service panel will allow.
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The leading causes of death in the US are heart disease, cancer, and stroke
Indicate whether the statement is true or false
Answer the following statement(s) true (T) or false (F)
1. If properly designed, a closed-loop hydronic system should rid itself of most air within a few days of initial start-up. 2. The oxygen that causes corrosion is the same oxygen that forms water molecules. 3. Circulators transfer maximum head energy to incompressible fluids (e.g., liquids). A mixture of water and air is an example of an incompressible fluid. 4. Air has much lower specific heat and density than water. 5. Circulators with internal spring-load check valves installed in vertical piping with upward flow are especially susceptible to air pockets.
All ____________________ carburetors use a float to control the fuel level.
Fill in the blank(s) with the appropriate word(s).
The Russo-American Treaty of 1824 fixed the southernmost limits of Russian occupation of North America at
A. 54° 40', the present southern tip of the Alaska panhandle. B. 36° 30'. C. the 42nd parallel. D. the 49th parallel. E. the 51st parallel.