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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Explain the operation of the evaporative (EVAP) emission system.

What will be an ideal response?

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What type of chain is commonly used in a transfer case?

A) Rocker pin B) Roller chain C) Double roller chain D) Any of the above, depending on application

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Developing countries:

a. Are monolithic, all having common characteristics. b. Experience similar consequences from U.S. assistance. c. Are at different stages of development; therefore, treating them the same is treating them different. d. Become our competitors if we assist in developing their agriculture. e. All of the above.

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Large rooftop package AC units often use ________ to help draw in fresh air to meet code requirements and to cool if temperature and humidity permit

A) an economizer B) airflow C) enthalpy D) low pressure

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