Part 1.1 Flashcards
A properly fitted ear mold should:
a) Hold the Receiver in place
b) Seal the ear canal in some cases
c) Direct amplified sound towards the Tympanic Membrane
d) Be Cosmetically appealing
e) All of the above
e) All of the above
The transistor depends upon the flow of electrons through:
a) A gas
b) A semi-conductor
c) A solid
d) a and c
e) b and c
e) b and c
A transistor does what?
a semiconductor device that amplifies, oscillates, or switches the flow of current between two terminals by varying the current or voltage between one of the terminals and a third
Which of the following pairs correctly compares transistors to vacuum tubes:
a) Emitter/Grid
b) Collector/Cathode
c) Base/Anode
d) Semi-conductor/filament
e) Current Amplifier/Voltage Amplifier
d) Semi-conductor/filament
A filament is the thin wire current runs through in a light bulb, and a semi-conductor is the thin strip of material that current runs through in a transistor.
One of the following statements about volume controls is not accurate:
a) Allows user to select a comfortable listening level
b) Are mostly of the carbon type
c) Has consistent taper from aid to aid
d) Has a range of between 30 - 40 dB in an aid
e) Is sometimes a screw set control
b) Are mostly of the carbon type
The key here is that most people miss the word ‘not.’ Go through the questions looking for what is true, and isolate the answer that is not. There is such a thing as a carbon controls, but they are not common to hearing aids. I believe they were discontinued decades ago.
Which of the following battery cells is used most frequently today:
a) Mercury
b) Silver oxide
c) Nicade
d) Zinc oxide
e) Zinc air
e) Zinc air
The sound applied to the microphone is referred to as:
a) Output
b) MPO
c) Input
d) Saturation
e) Gain
The sound applied to the microphone is referred to as:
c) Input
Sound is ‘put in’ to the microphone.
MPO stands for what & what does it mean?
Maximum Power Output
The greatest sound resulting from amplification that a hearing aid instrument can produce; an indication of hearing aid performance.
The failure for a system to reproduce a wave form exactly is:
a) Frequency response
b) Distortion
c) Compression
d) Rarefaction
e) Saturation
b) Distortion
Define Distortion
The failure of a system to reproduce a signal with accuracy and exactness. Frequencies that were not present in the original signal.
How many types of distortion are there, and what are they called?
Harmonic, intermodulation and transient.
Define Harmonic Distortion
Harmonics, or overtones, produced by a signal in addition to its basic frequency.
Caused when a hearing aid overloads the amplifier or earphone which then distorts the waveform and adds overtones that are superimposed on the signal, thus altering the original signal.
Define Intermodulation Distortion
When two or more waves of different frequencies are simultaneously passing through an amplifier, causing severe harshness to the signal.
Define Transient Distortion
Transient sounds bursting forth suddenly at relatively high loudness levels, and breaking off just as fast. Speech and music are full of transients. When a hearing aid cannot attack and decay sufficiently, the ear perceives sound as cloudy or washed out.
The latest performance standards for hearing aids to which they are manufactured is:
a) ANSI 1987
b) HAIC 1999
c) ANSI 1984
d) ANSI 1996
e) ISO 1995
d) ANSI 1996
If a hearing aid has a gain of 40 dB and the input is 65 dB, the output will be:
a) 100 dB
b) 130 dB
c) 15 dB
d) 125 dB
e) 105 dB
e) 105 dB
This is straight mathematics, 65 db is put in, turn up the gain 40db, and you’re going to have a total output of 105 db.
Define Gain
The amount of additional intensity added by a hearing aid or other amplifying device to an incoming signal during the amplification process.
If the maximum output of an aid is at 2000 Hz and is 120 dB, with a gain of 50 dB what was
the input?
a) 60 dB
b) 50 dB
c) 70 dB
d) 90 dB
e) they are equal at 1000, 1600 and 2500 Hz
c) 70 dB
Again, straight mathematics. It will help if you draw a simple vertical line to measure the gain and input.
The kicker in this question is that 2000 Hz doesn’t matter. It is irrelevant and extraneous.
The component which gives the patient direct control of the amplification is:
a) Trim pot
b) program button
c) Volume control
d) Receiver
e) Potentiometer
c) Volume control
The event which lead to electrical hearing aids was:
a) Transistor development
b) Vacuum tube development
c) Carbon-telephone development
d) Battery development
e) IC development
d) Battery development
The answer is batteries because they deal with the power source, and it wasn’t until batteries
became small and light that a hearing Aid came into its own.
Your client purchased two hearing aids 6 months ago from another Hearing Aid Dispenser.
The client is not satisfied with the hearing aids performance and does not want to return
to that Dispenser. You should ____ ?
a) Encourage him to go back to the original specialist anyway
b) Return the hearing aids as soon as possible
c) Re-test and evaluate the fitting
d) Re-test and fit with other hearing aids.
c) Re-test and evaluate the fitting
This is a tricky one, and you might want to look into what your state recommends. The key here, however, is probably the time.
One month and you might send him back to his first Hearing Aid Dispenser. But when do you scoop him in? Tough question.
Another key is his wishes. He doesn’t want to go back.
No tried and true answer here, merely a little thought concerning the situation.
The primary functions of the outer, middle and inner ear include…
a) Equilibrium
b) Hearing
c) Auditory processing
d) a and b
e) b and c
d) a and b
So what, exactly, is auditory processing? Google it and you’ll find a lot of disorders. I’m sure it refers to some part of the hearing process, but it implies a function, as opposed to just the transmission of sound through the ear.
So, because this term was ambiguous, it gets tossed out. Process of elimination.
When sound consists of only one frequency it is called?
a) Noise
b) Puretone
c) Tone
d) Rarefaction
b) Puretone
