A piping system that has the main supply pipe from the boiler enter the first baseboard unit, all baseboard sections connected in series, and the outlet from the last baseboard section connected to the circulator pump, which connects to the boiler is called a
A) Series loop, double circuit
B) Two pipe, reverse return hot water piping system
C) Series loop, single circuit hot water piping system
D) One pipe, venturi piping system
C
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Peat, first used about 2000 years ago, was important because ____
a. it produces a very high heat when burned b. it can be used while still wet c. its low burning heat can be used as an energy source d. it is found in desert-like areas
Most nitrogen used is produced by a synthetic process from air
Indicate whether the statement is true or false
Fish are ____________________, which means that they depend on the environment to provide the body temperature needed for life
Fill in the blank(s) with correct word
Which of the following quantities canNot be a negative number?
A. Temperature, when expressed in kelvins. B. Pressure, when expressed as gauge pressure. C. Potential energy, when expressed using the convention that h = 0 at sea level. D. Internal energy, when expressed relative to a reference state of T = 273.15 K and P = 0.1 MPa. E. All of the above could be negative numbers.