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Earmold Acoustics, Size Does Matter!

View Course Details Please note: exam questions are subject to change.

1.  Which of the following earmold components does not have an essential acoustical function?
  1. Vent
  2. Pull Cord
  3. Tube
  4. Receiver
2.  What is the significance of wall thickness in an earmold?
  1. Restricts selection of receiver size
  2. Helps selection of tubing
  3. Restricts selections based on aesthetics
  4. All of the above
3.  What instrument is recommended to verify dimensional suitability for placing both vent and receiver in an earmold?
  1. Caliper
  2. Otoscope
  3. Audiometer
  4. Ruler
4.  Which vent type should be considered when desired vent size cannot be placed in earmold due to size restrictions?
  1. Selective vent
  2. IROS
  3. External/Trench Vent
  4. None
5.  Having aesthetic concerns in mind, what should you consider for hearing aid type when there is not enough room for any receiver size due to wall thickness restrictions?
  1. Larger receiver size
  2. BTE Hearing Aid with either slim tube or #13 tubing
  3. Receiver with angled nozzle
  4. CIC Hearing Aid
6.  In what circumstances should you consider receivers with angled nozzles?
  1. Profound hearing loss
  2. Tinnitus
  3. Ear canal with sharp first and second bends and limited space between first and second bends.
  4. None of the above.
7.  Which of the following best describes the function of acoustic mass in earmolds?
  1. Dictates the physical weight of the earmold
  2. Dictates how much unaided ambient sound passes through the vent, and how much internal sound (e.g., voice) leaks out of the vent
  3. Provides uniform attenuation at all frequencies, to improve musical appreciation
  4. All of the above
8.  Which of the following is NOT CORRECT for the relation between acoustic mass and vent?
  1. Acoustic mass increases as both earmold vent length and diameter increase
  2. Acoustic mass increases as vent length decreases and diameter increases
  3. Occlusion effect can be decreased by decreasing acoustic mass of the vent
  4. Occlusion effect can be estimated based on acoustic mass
9.  Which of the following is NOT a benefit of custom earmold over universal domes?
  1. Achieving desired acoustic mass
  2. Consistency in achieving desired acoustics
  3. Cost
  4. Predictable acoustic results for each individual
10.  Precise acoustic mass can be achieved with the following earmold production method:
  1. 3D Design & 3D Print
  2. Drilling for vent with appropriate tool
  3. Casting
  4. Combination of all

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