What type of system heats air in a central furnace and then uses a fan to send it through ducts to distribute heated air to diffusers placed throughout the residence?
A. two-pipe
B. series-loop
C. forced-air
D. plenum
Answer: C
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Las condiciones de servicio habituales de la NEMA incluyen una variación de frecuencia de no más de _____ de la frecuencia nominal.
a. 0.01 b. 0.05 c. 0.15 d. 0.2
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Which soil sample, the field soil or the forest soil, held more water?
What will be an ideal response?
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What type of antifreeze solutions may be used in ground loops?
A) Low toxicity B) Preferably ethylene glycol C) Any antifreeze that will extend the freezing point down to -35°F D) A brightly colored antifreeze solution should be used to make it visible in ground water.
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In the freehand technique, the GTAW filler rod should be held at what angle to the plate surface?
A) 37-1/2 degrees B) 10 degrees C) 20 degrees D) 45 degrees
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