Part 4.3 Flashcards
Zero dB on an audiometer Hearing Level dial:
a) Produce intensities that vary as a function of frequency
b) Is the same intensity re: 0.0002 dynes/cm2
c) Is equal to 0.0002 dynes/cm2
d) Has always had the same SP for all audiometric pure-tone standards
e) Is 0 sensation level
a) Produce intensities that vary as a function of frequency
Change the frequency and you change the sound pressure level.
The SPL associated with 90 dB HL for speech under headphones is:
a) 90 dB SPL
b) 110 dB SPL
c) 70 dB SPL
d) 65 dB SPL
e) 0 dB SPL
b) 110 dB SPL
Remember the extra 20 dB.
A possible way to use a conventional speech audiometer to determine MPO of an aid is to:
a) Limit MPO to the TD reading in HTL
b) Convert TD to SPL and limit MPO to this level
c) Read TD directly in SPL and limit MPO to this level
d) Read TD directly in HTL and subtract about 20 dB
e) Not possible to do
b) Convert TD to SPL and limit MPO to this level
Think your way through this one.
One of the most important but overlooked measurements in hearing aid selection is the:
a) SRT
b) SDS
c) TD
d) DR
e) Binaural effect
c) TD
Modifications of the hearing aids basic response can be provided by:
a) Damping elements in the receiver
b) Tubing length
c) Cerumen in the sound bore of earmold
d) Mechanical tone switches
e) All of the above
e) All of the above
The two forces being measured on a tympanogram represent _____ ?
a) Compliance and decibels
b) Compliance and pressure
c) Pressure and Hertz
d) Decibel and Hertz
b) Compliance and pressure
If real ear aided gain is 25 dB, real ear unaided gain is 5 dB, then 20 dB is?
a) Real ear functional gain
b) Real ear insertion response
c) Real ear insertion gain
d) Real ear occluded gain
c) Real ear insertion gain
Mr. Goodnight is having trouble with feedback on both his 5-week old hearing aids, but is otherwise hearing well. After an initial interview and counseling, you should first….
a) Retest his hearing
b) Perform an otoscopic exam
c) Clean and check the hearing aids
d) Plug the vent
b) Perform an otoscopic exam
If he is hearing well, then the aids are functioning. Check his physical ear.
The most appropriate modification you might try to alleviate feedback is….
a) Increase the vent diameter
b) Decrease the vent diameter
c) Shorten the vent
d) Bell the canal
b) Decrease the vent diameter
Feedback results from proximity of microphone to receiver. B is the only one that handles this. Think about what each solution does.
The amplifier that has a high compression ratio and a high kneepoint is most likely the…
a) DSP
b) Output compression
c) Input compression
d) WDRC
b) Output compression
It’s the only one that makes sense.
HFA full-on gain which uses combinations of frequencies in its calculation…?
a) 500, 1000, and 2000 Hz
b) 500, 1000, and 2500 Hz
c) 1000, 1600, and 2500 Hz
d) 500, 800, and 1600 Hz
c) 1000, 1600, and 2500 Hz
HFA is the key. These are the frequencies used.
Reference Test Gain Position is determined by adjusting the gain control so that HFA gain is equal to HFA OSPL 90 _____?
a) Minus 17 dB
b) Minus 20 dB
c) +/- 2 dB
d) Plus 5 dB
a) Minus 17 dB
Straight memorization.
ANSI peak gain of a hearing aid is determined when the volume control is adjusted to _____?
a) Full-on
b) RTG position
c) Mid position
d) WDRC
a) Full-on
The keyword is peak.
