Quiz
notes
sound pressure, dB ref 20 mPa
80
70
60
50
40
30
20
10
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63 | 125 | 250 | 500 | 1,000 | 2,000 | 4,000 | 8,000 |
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| Figure 74 | |||||
Questions for Period 3
7True or False: Sound can only travel from a source to the receiver along one path.
8True or False: One piece of HVAC equipment may contain several sound sources.
9What term is used to describe the reduction in sound that enters a room as it travels to the receiver? It is influenced by distance and the absorptive and reflective characteristics of the surfaces and furnishings in the room.
Questions for Period 4
10A _______ (free or reverberant) sound field is characterized by a uniform, or diffuse, sound field where the sound pressure is equal at all points in the field.
11What recent ARI standard, which rates the sound due to ducted air moving and conditioning equipment, requires testing of the entire air handler, not just the fan?
69 |
