48.
The three basic parts of a standard sound level meter are the:
a. Calibrator, amplifier, and indicating meter.
b. Microphone, amplifier, and indicating meter.
c.
Microphone, presbycusis, and indicating meter.
d. Indicating meter, acoustical barrier, and amplifier.
49.
Which weighting network sound level meter scale empathizes those frequencies,
which the human ear responds?
a. dB (A).
b. dB (B).
c.
dB (C).
d. a and b.
50.
Which statement about the sound lever meter is correct?
a. The American models are furnished in four types offering varying degrees of
precision.
b. The designated Types 0, 1, and 2 are in decreasing order of tolerances.
c.
By combining an octave band filter with a sound level meter, you can
determine the pattern of the distribution of sound pressure at different points or
areas along the scale of audible frequencies.
d. The Type 2 generally measures within 4 to 6 dB of true levels.
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