Exam Preview for 20496: Clinical Verification of Custom-Fitted Musi

Clinical Verification of Custom-Fitted Musicians Earplugs

Please note: exam questions are subject to change.

1. The term "damage-risk criteria" (DRC) specifies: the combination of sound level and duration that is considered to have equivalent hearing loss risk the maximum sound level of allowable exposure in a given country the maximum sound duration of allowable exposure in a given industry how much hearing loss can be expected from a sound exposure
2. The Transfer Function of the Open Ear (TFOE) is synonymous with: REUG s-REM MP3 HRTF
3. Which of the following tenets of a Hearing Loss Prevention Program are known to be the most effective at preventing hearing loss but often the most difficult to implement? Noise survey Audiometric monitoring Education and motivation Hearing protection devices
4. The term "timbre" reflects a quality of music that can be best explained acoustically as: The range of frequencies each instrument can produce The range of intensities each instrument can produce The relative difference, in dB, between the fundamental and the harmonics and is particular to different musical instruments The time duration that a musical note can be sustained by different instruments, measured in seconds until the tone is 3 dB down from the attack
5. What is the effect of a slit-leak of a Musicians Earplug that is not snuggly fitting in the ear canal? Increased attenuation in the high frequencies Loss of attenuation in the low frequencies Loss of attenuation in the high frequencies Increased attenuation in the low frequencies
6. What is the effect of too short a canal portion of the sleeve of the Musicians Earplug? Increased acoustic mass resulting in too much inductance Reduced acoustic resistance resulting in less attenuation than specified Increased acoustic resistance resulting in more attenuation than specified Reduced acoustic mass resulting in inadequate inductance
7. Which musicians typically have the most difficult time adjusting to Musicians Earplugs? vocalists bassists guitarists drummers
8. What manufacturing modification can be used to manage the occlusion effect in Musicians Earplugs? Ear canal portion of the sleeve extended to the 2nd bend Ear canal portion shortened to no deeper than the 1st bend Full shell rather than canal only, including helix lock Increase the attenuation rating of the filter
9. What is a drawback to using soft silicone for sleeve fabrication? Cannot make sleeve a custom color Less comfortable The sleeve shrinks over time, resulting in slit-leak Harder to insert into the ear canal
10. How might a musician learn to adjust to the use of Musicians Earplugs? Record rehearsal with and without the plugs Rehearse with one plug in and one plug out Rehearse with plugs in and perform with plugs out Use earplugs during all waking hours