How can an air source heat pump heat when the outdoor temperature is cold?
A) All molecules contain some heat until they reach absolute 0 (-460°F)
B) The friction of the air passing over the outdoor coil raises the temperature
C) Air source heat pumps only use the outdoor air in the cooling season
D) All heating is accomplished with electrical resistance heaters, so the air temperature is irrelevant
A
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If benefits are $10,000 per year forever starting in year 1, and costs are $50,000 at time zero and $50,000 at the end of year 2, the B/C ratio at i = 10% per year is closest to:
(a) 0.93 (b) 1.10 (c) 1.24 (d) 1.73
Mind and language arose as progressive ________ of the organism to its environment
A) Equilibriums B) Communications C) Adaptations D) None of the above
What is the loop antenna's major application?
A. Good gain over extremely wide range of frequencies B. Broadcast AM receivers C. Receiving antenna for broadcast FM D. Direction finding
Match the line symbols with the terms they represent.
A. hydraulic signal B. software link C. sonic signal D. instrument supply E. F. G. H. I. J. K.