What can cause the heat exchanger flow resistance to increase after several years of operation?
What will be an ideal response?
Soot accumulation
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Residential and commercial plumbing systems installed at sea level operate at a pressure of _____.
a. 12.1 psia b. 14.7 psia c. 16.2 psia d. 20.4 psia
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Common sources of ignition include electricity, sparking metal, heat-generating equipment, and failed _____.
a. electrical connections b. hydraulic connections c. pneumatic connections d. mechanical connections
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____________________ welding is a process where fusion between the parts' surfaces occurs as a result of the heat produced by the electric resistance between the parts' contacting surfaces.
Fill in the blank(s) with the appropriate word(s).
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Frequent and constant computer use has lead to an explosion of injuries. These injuries are known as