Ultraviolet light-generating equipment can be used in HVAC air distribution systems to _____.
a. reduce odors caused by cigarette smoke
b. help prevent the growth of bacteria and micro-organisms
c. protect coils and drain pans from ice buildup
d. examine the duct work for cleanliness and damage
[Ques. 2] The high-voltage power supply in an electronic air cleaner is connected to the ionizer section and the _____.
a. charcoal section
b. collector section
c. prefilter section
d. first section
[Ques. 3] When free cooling operation is not practical but the system is operating in an occupied mode, an economizer
damper will be in its _____.
a. fully open position
b. fully closed position
c. half open position
d. minimum position
[Ques. 4] Poor ventilation may exist in a building when the concentration of carbon dioxide in the building exceeds
_____.
a. 100 ppm
b. 500 ppm
c. 1,000 ppm
d. 1,300 ppm
[Ques. 5] 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
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