The vanes of the impellers used in circulating pumps in hot water heating systems are usually enclosed, and are referred to as ____________________ impellers.
Fill in the blank(s) with the appropriate word(s).
closed
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What kind of water closet has a tank bolted directly to the bowl?
a. one-piece unit b. close-coupled c. corner tank d. reverse trap
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What do the last five numbers in the UNS system designate?
What will be an ideal response?
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According to Pascal’s law, the resulting pressure transferred in a system can be changed by using
different sized pistons.
Indicate whether the statement is true or false.
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Flame rectification is used on a(n) _____
a. HSI b. spark igniter c. automatic gas valve d. standing pilot
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