?Geothermal reservoirs with temperatures _____ offer a source of direct heating for homes, offices, and greenhouses.
A. ?greater than 300°F
B. ?less than 300°F
C. no greater than 220°F
D. ?equal to or less than 220°F
Answer: B
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Active direct systems use pumps and ____ sensors to circulate water from the collectors to the storage tank as needed.
A. wind B. solar C. water D. temperature
36 V of dc is applied to a windings ratio of 1:2. What is the secondary voltage?
A) something slightly less than 72 V since transformers do have some loss B) 144 V C) 72 V D) none of the above
All of the following support the engine's operation EXCEPT:
A. the fuel system B. the electrical system C. the drive shaft D. the lubrication system
What is the estimated atmospheric half-life and removal process for
a. Ultrafine particles b. Fine (accumulation) particles c. Coarse particles What will be an ideal response?