What materials are most commonly used for hydronic piping?

A) PVC and CPVC B) Copper and cross-linked polyethylene
C) CPVC and polybutylene D) Copper and galvanized iron


B

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When crystalline plastics are melted, the crystalline regions unfold, and the entire structure becomes ____.?

A. ?annealed B. ?polarized C. ?amorphous D. ?uniaxial

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Adjustments can be made on constant supports by turning the _____.

a. adjusting turnbuckle b. coupling on the lower hanger rod c. single load adjustment bolt d. coupling on the upper hanger rod

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Good electrical insulators include:

A) Copper, aluminum, and steel. B) Ceramic, rubber, and plastic. C) Steel, iron, and aluminum. D) Gold, silver, and copper.

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When reading a meter, it is very important that you ____.

A. hold it at eye level B. make sure it is varying C. make sure it is digital D. be directly in front of it

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