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TRG-TRC007-EN 69
Quiz
notes
Questions for Period 3
7 True or False: Sound can only travel from a source to the receiver along one
path.
8 True or False: One piece of HVAC equipment may contain several sound
sources.
9 What 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
10 A _______ (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.
11 What 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?
NC
NC
-
-
15
15
NC
NC
-
-
20
20
NC
NC
-
-
25
25
NC
NC
-
-
30
30
NC
NC
-
-
35
35
NC
NC
-
-
40
40
NC
NC
-
-
45
45
NC
NC
-
-
50
50
NC
NC
-
-
55
55
NC
NC
-
-
60
60
NC
NC
-
-
65
65
70
70
50
50
40
40
30
30
20
20
10
10
sound pressure, dB ref 20
sound pressure, dB ref 20
m
m
Pa
Pa
80
80
60
60
octave
octave
-
-
band frequency, Hz
band frequency, Hz
63
63
125
125
250
250
500
500
1,000
1,000
2,000
2,000
4,000
4,000
8,000
8,000
Figure 74