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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