The inner tube of heat exchangers of water-source heat pumps have extended surfaces called ____________________, which increase the surface area for better heat transfer.

Fill in the blank(s) with the appropriate word(s).


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Which of the following determines the speed at which a turbocharger rotates?

A. exhaust gas pressure B. exhaust gas heat C. ambient temperature D. ambient pressure

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An insulator is a material that has free electrons available.

Answer the following statement true (T) or false (F)

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When solving problems with combined operations, sometimes it will require more than one step to solve the problem.

Answer the following statement true (T) or false (F)

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5 + 3^2 =

A) 16 B) 14 C) 64 D) 11

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