An optional item of equipment used to recover about 60 to 80 percent of the energy contained in the air exiting a system and to deliver the energy to the incoming air is a(n) _____.
a. ERV/HRV
b. evaporative pre-cooler
c. bypass humidifier
d. economizer
a. ERV/HRV
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The fall-of-potential method is used to measure _____.
a. induced currents b. step voltage c. earth resistance d. touch voltage
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Una carga de tubos se eleva más comúnmente con _____.
a. vigas de izamiento b. cuerdas de un torno iza- dor que envuelven la carga c. orejetas de izamiento d. obturadores y eslingas
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The SAE overlaps with the FFA
Indicate whether the statement is true or false.
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A benefit of operating a compressor unloaded is ____.
A. reduced energy costs B. reduced compression ratios C. increased cooling D. both a and b
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