Review Of Quizes

Front 1

Sound cannot travel through what medium:

Back 1

Vaccum

Front 2

Any complex sound can be broken down into individual frequencies by a technique known as:

Back 2

Fourier Spectral Analysis

Front 3

How many octaves occur from 125 Hz to 2000 Hz?

Back 3

4

Front 4

The quality or timbre of a sound is a property that depends on:

Back 4

*how many frequencies are in the complex sound
*the relative strength of each frequency
*the resonance of the sound cavities

Front 5

The speed of sound in air, in feet per second, is:

Back 5

1100

Front 6

What does the term '67 dB' mean?

Back 6

It's meaningless without a refrence level.

Front 7

The decible is:

Back 7

A ratio between two intensities.

Front 8

A formant is:

Back 8

a frequency region within a complex tone where certain harmonics have relatively large energy

Front 9

The weakest sound normal human ears can hear in the most sensitive frequency range of the ear is an effective sound pressure of about:

Back 9

0.0002 dynes/cm2

Front 10

The normal human ear canal resonance is in the approximate range of:

Back 10

2500- 4000HZ

Front 11

The harmonics of speech reinforce some frequencies more than others. The reinforced frequencies are:

Back 11

Formants

Front 12

Vowels differ from consonants in that they:

Back 12

use more open vocal cord voicing

Front 13

When tilting the frequency response, the last number in a matrix, i.e. 110/37/15, means:

Back 13

the 15 dB difference occurs between 500 Hz and the first peak

Front 14

The patient's MCL on a speech circuit of the audiometer is usually judged on:

Back 14

the volume at 1000 Hz

Front 15

ANSI developed the Articulation Index (AI) to express:

Back 15

Speech Clarity

Front 16

'Positive reinforcement' involves:

Back 16

presenting a tone that is only inaudible without the instrument on

Front 17

Our quest of improving speech understanding begins by studying:

Back 17

speech production

Front 18

Most auditory systems follow a power law. This logarithmic concept is:

Back 18

a 10 dB increase in sound pressure doubles the loudness

Front 19

Sones compare:

Back 19

loudness up frequency

Front 20

Mels measure:

Back 20

Pitch

Front 21

Dexterity of a patient's fingers enter into the choice of instruments because of difficulty in:

Back 21

*inserting the earmold into the ear
*replacing the battery
*adjusting the volume or any of the controls of the hearing aid

Front 22

A bone conduction instrument should be used when:

Back 22

The patient has chornic otitis media.

Front 23

Basic problems for clients with an asymmetrical hearing loss are:

Back 23

*discriminating speech from the side of the head with no usable hearing
*an inability to locate sound
*hearing in the presence of noise

Front 24

Pressure Measuring Instruments (PMI's) are:

Back 24

built to the sound pressure standard of 20 micropascals

Front 25

Properly selected hearing instruments should allow:

Back 25

*the patient to wear an instrument at a comfortable loudness level
*improved communication ability of normal conversational speech in noise
*better hearing, aided, than unaided

Front 26

Slope of loss can determine a successful fitting. A most favorable slope is:

Back 26

Flat or gradually falling.

Front 27

Calculations of amplified sound to patients MCL include:

Back 27

operating gain, functional gain, insertion gain

Front 28

Calculating prescription formulas are compared to:

Back 28

specification sheets

Front 29

Some patients with binaural amplification can experience:

Back 29

degradation effect

Front 30

The following fitting requires amplification to two ears:

Back 30

binaural

Front 31

Functional gain testing with CIC instruments is:

Back 31

simple for the patient to understand with less test-retest variablility than conventional sound field testing

Front 32

With real ear measurement testing, which of the following is true:

Back 32

the probe should be within 5 mm of the eardrum in order to avoid standing waves

Front 33

The deeper microphone placement offers what advantage:

Back 33

natural high frequency emphasis between 2700 and 4000 Hz

Front 34

The deeper receiver placement offers what advanatage:

Back 34

increased headroom with undistorted output

Front 35

CIC's offer a reduction in feedback for ALL but the following reasons:

Back 35

increased headroom with undistorted output

Front 36

The Occlusion Effect is due to:

Back 36

increase in bone-conduction sound for frequencies below 2000 Hz

Front 37

When the wind is coming from directly ahead, wind noise is reduced in CIC's by the following amount:

Back 37

23dB

Front 38

What is an advantage of CIC fittings:

Back 38

introduction of programmable CIC's

Front 39

Earmold impressions for CIC's should:

Back 39

extend at least 2 mm beyond the second bend using medium viscosity, silicon material

Front 40

With CIC fittings, which of the following frequency modifications should be made:

Back 40

less high frequency amplification should be provided due to the deeper microphone placement

Front 41

The Zeta Noise Blocker was:

Back 41

an example of a hybrid analog-digital hearing instrument

Front 42

The first commercially available digital signal processing hearing instrument:

Back 42

included a body-worn electronic processor

Front 43

A programmable hearing instrument with 4 channels and 1 memory could be considered a ___________ programmable hearing instrument:

Back 43

class 3

Front 44

In digital signal processing, a set of mathematical steps involving multiplication, addition, and subtraction is referred to as:

Back 44

algorithm

Front 45

The number 512 would have a binary code of:

Back 45

100000000

Front 46

The sampling rate:

Back 46

*refers to how often the waveform amplitude is measured
*has a direct bearing on the frequency bandwidth of the hearing instrument
*must be at least twice as fast as the highest desired frequency

Front 47

Quantization is related to:

Back 47

number of bits

Front 48

The number of bits impact the:

Back 48

dynamic range of the hearing instrument

Front 49

Imaging occurs during the:

Back 49

digital to analog conversion stage

Front 50

List 3 items related to SIE-O fitted hearing aids

Back 50

*the occlusion effect is minimized
*the speaker uses a soft silicone dome or molded, vented acrylic tip to secure the speaker in the ear canal
*allows for more gain than does a SIA instrument

Front 51

Which statement is correct relative to the comparison between the SIE-O and SIE-S hearing instrument styles?

Back 51

the SIE-S provides greater acoustic advantages than does the SIE-O

Front 52

SIA hearing aids are designed primarily to:

Back 52

reduce occlusion and the occlusion effect

Front 53

SIA open-fit hearing aid applicable gains, without feedback cancellation, shows that the maximum stable gain before feedback to be closest to:

Back 53

20 dB

Front 54

The Vent as a two-channel device, is identified with:

Back 54

any open fit or vented hearing aid

Front 55

Small diameter tubing of SIA hearing aids has the effect of:

Back 55

reducing the high-frequency gain

Front 56

With SIE-S hearing aids:

Back 56

the only signal is from the hearing aid and phase effects from a vent are not an issue

Front 57

Evidence suggests that the practical, maximum stable high-frequency gain of an open-fit device, when feedback cancellation is activated, is closest to:

Back 57

30dB

Front 58

Performance verification of SIA, SIE-O, and SIE-S hearing aid fittings is best made by:

Back 58

real-ear probe microphone measurements

Front 59

Name 3 advantages of both the SIA and SIE hearing aid fittings:

Back 59

*cosmetic improvement, rendering the instrument essentially 'invisible' when worn
*improved efficiency in the dispensing office
*same-session fit with patient having an opportunity to experience immediately the final fit (cosmetics, sound, comfort)

Front 60

Does a programable hearing aid cost more than an analog hearing aid?

Back 60

Programable hearing aid cost more

Front 61

When you cup your hand behind the ear, sound:

Back 61

increases by 5-8 dB

Front 62

The first patent for a telephone type hearing instrument was in:

Back 62

1892

Front 63

The first electric hearing instrument

Back 63

collected and amplified sound

Front 64

The carbon granule microphone:

Back 64

caused static and fading with body movement

Front 65

Desk and suitcase sized hearing instruments, popular in the 1920's, had more gain and clarity because of:

Back 65

vacuum tube amplifiers

Front 66

Wearable instruments were a result of:

Back 66

the miniature vacuum tube

Front 67

Crystal microphones and receivers:

Back 67

are very fragile

Front 68

A FET changed the high impedance problems of the:

Back 68

ceramic microphone

Front 69

Magnetic microphones:

Back 69

have a good frequency response in the speech range

Front 70

The miniature vacuum tube was introduced in about:

Back 70

1938

Front 71

The three major concepts in the use of electricity are:

Back 71

current, voltage and resistance

Front 72

A capacitor:

Back 72

blocks the low frequencies and passes the high frequencies

Front 73

A resistor:

Back 73

restricts the flow of electrons

Front 74

'Energy cannot be created or destroyed' is:

Back 74

the law of conservation of energy

Front 75

The following is not a transducer:

Back 75

volume control

Front 76

Electrical energy uses the atom. Atoms:

Back 76

are electrically neutral

Front 77

Part of the basic law of electrical energy is:

Back 77

protons attract electrons

Front 78

To produce current:

Back 78

electrons move from atom to atom

Front 79

A greater flow of current produces:

Back 79

more volume

Front 80

Semi-conductors act like a conductor with the application of:

Back 80

heat, light or an electric field

Front 81

The function of a microphone is to:

Back 81

convert acoustic energy into electrical energy

Front 82

Coupling in a hearing instrument refers to connecting:

Back 82

one stage of an amplifier to the next

Front 83

The 'T' position on a hearing aid switch can be used to:

Back 83

*amplify a telephone conversation
*couple a hearing aid into a loop inductor system
*couple directly into the audio of a radio or TV set with a separate induction coil

Front 84

The following components can change or modify the frequency response of a hearing instrument:

Back 84

a microphone

Front 85

The following is a transducer:

Back 85

electret microphone

Front 86

Amplifiers:

Back 86

generate distortion

Front 87

A linear amplifier has a 1:1 relationship. This means that if you rotate the volume control on a linear aid, you change:

Back 87

the gain and output

Front 88

Hard peak clipping occurs in a:

Back 88

a class A amplifier

Front 89

Peak rounding:

Back 89

causes harmonic distortion above the knee

Front 90

There are two types of compression - input and output. The difference is:

Back 90

the placement of the feedback loop

Front 91

The signal/noise ratio of a hearing aid response is:

Back 91

the difference in decibels between the signal and the noise in the system

Front 92

Acoustic gain is measured in:

Back 92

decibels SPL

Front 93

High Frequency Average (HFA) full-on gain is measured by averaging the gain at:

Back 93

1000, 1600 and 2500 Hz

Front 94

High Frequency Average SSPL 90 (HFA SSPL 90) refers to:

Back 94

high frequency average saturation sound pressure level with a 90 dB SPL input

Front 95

The Saturation Sound Pressure level should:

Back 95

directly relate to the client's UCL

Front 96

ANSI standards can compare:

Back 96

one instrument to another

Front 97

The SSPL90 curve measures:

Back 97

all the tones across frequency

Front 98

All ANSI instrument measurements are:

Back 98

SPL

Front 99

Input sound pressure is measured:

Back 99

at the microphone opening of the hearing instrument

Front 100

Gain control is another name for:

Back 100

volume wheel

Front 101

A small pressure vent (0.020 to 0.030) in an earmold will:

Back 101

*have little or no effect on frequencies above 400 Hz
*generally reduce levels at frequencies below 200 Hz
*reduce atmospheric pressure build-up

Front 102

A long canal on the earmold has the effect of:

Back 102

accentuating the low frequencies

Front 103

Venting an earmold:

Back 103

is the most common modification made on an earmold

Front 104

The non-occluding earmold is excellent to use on:

Back 104

a CROS fitting

Front 105

Earmolds have two important parts:

Back 105

outer appearance and canal acoustics

Front 106

The greatest acoustic change in an earmold or ITE is:

Back 106

parallel venting

Front 107

The greatest deciding factors in material selection for an earmold are:

Back 107

power requirements

Front 108

To shift the resonant peak upward between 1500-3000 Hz, use:

Back 108

larger bore diameter

Front 109

In general, mold modifications are as follows:

Back 109

venting affects lows, damping the midrange and horn effects boost highs

Front 110

Which molds have the same outer appearance:

Back 110

skeleton and 2 HF

Front 111

Residual hearing, in combination with the hearing instrument, will:

Back 111

help improve communication

Front 112

At night, the battery in the instrument:

Back 112

can be left in the open battery door

Front 113

A BTE instrument, properly attached:

Back 113

fits the contour of the ear

Front 114

An advantage of a CIC fitting is:

Back 114

*reduced acoustic feedback during phone use
*decreased wind noise

Front 115

When adjusting the volume control, the patient must:

Back 115

find an area on the control where sounds are comfortable

Front 116

When a standard instrument has a telephone coil, the patient:

Back 116

*switches to the 'T' position
*needs to increase the volume control

Front 117

Advise the patient to wear the instrument:

Back 117

regularly on a daily basis

Front 118

Binaural amplification allows the patient to:

Back 118

wear both instruments at a quieter volume setting

Front 119

The patient maintains the instrument by:

Back 119

keeping it clean and free of wax

Front 120

Teach the patient to:

Back 120

operate the OTM switches and noise switches

Front 121

Basic verification involves:

Back 121

checking MCL and UCL in quiet and noise

Front 122

Verification procedures:

Back 122

check the accuracy of your fitting

Front 123

An effective verification is:

Back 123

a measurable improvement in communication

Front 124

Functional gain of the instrument:

Back 124

is one method of fitting verification

Front 125

Speech tests measured through the audiometer circuit:

Back 125

are 20 dB less because of ANSI Standards

Front 126

Ideally, when presenting recorded words in noise:

Back 126

the words are 10 dB louder than the noise

Front 127

Sound field is:

Back 127

a controlled environment

Front 128

Most patients use enough gain in the hearing instrument to understand quiet speech at a level of:

Back 128

55 dB SPL

Front 129

When UCL's are not balanced, a loud signal is perceived as:

Back 129

lateralizing to the ear with the higher output

Front 130

The following measurements use SPL as a reference:

Back 130

*probe microphones
*sound field aided thresholds
*ANSI specifications

Front 131

Which of the following is not a coupler used for measuring hearing aid performance:

Back 131

Zwisks Ear Simulator

Front 132

A Real Ear Measurement System incorporates all of the following:

Back 132

Signal Generator, Reference Microphone, Measurement Microphone, Display Device

Front 133

REUR Measurements are taken in:

Back 133

an open human ear canal

Front 134

At what distance from the Tympanic Membrane should the end of the probe tube be placed:

Back 134

within 5 millimeters

Front 135

When testing compression hearing aids which signal type is best to use:

Back 135

Fast Fourier Transform

Front 136

Loud speaker placement should be:

Back 136

1 meter at 45° azimuth

Front 137

Which of the following are included in correct test protocols:

Back 137

*adjusting the Probe Tube to minimize Standing Waves
*using the same stimulus type and level for all measurements
*inserting the instrument with the power turned off

Front 138

RESR Measurements for compression hearing aids have been replaced with:

Back 138

Real Ear aided responses

Front 139

Which of he following Real Ear targets has been documented to be the best for non-linear hearing aids:

Back 139

none have been proven to be better than any other

Front 140

Insertion Loss occurs when:

Back 140

The level in the ear canal with a hearing aid inserted is less than the input level

Front 141

Follow-up care is a variety of procedures which comprise:

Back 141

*long term management of the client's needs and use of amplification
*a process which never ends while the client is under the care of the hearing aid specialist
*bringing out the best that the instrument can give

Front 142

Emphasizing counseling to maximize amplification benefits is:

Back 142

a program that should start before the fitting

Front 143

Aural rehabilitation:

Back 143

continues for as long as the patient wears an instrument

Front 144

Patients are always aware of:

Back 144

the way they hear today

Front 145

When the patient experiences difficulties, one of the problems could be:

Back 145

*a procedural flaw in the original hearing loss assessment
*an error in judgement in hearing instrument selection
*misestimation of some aspect of the hearing problem

Front 146

User satisfaction must include:

Back 146

patient preference

Front 147

Client acceptance involves counseling on:

Back 147

*emotional and social concerns
*attitude and motivation

Front 148

Friends and family help patients wearing hearing instruments to hear better by:

Back 148

combining visual clues

Front 149

Your counseling avoids:

Back 149

unreasonable expectations

Front 150

Family and friends can have a negative influence on the patient by:

Back 150

expressing frustration that the patient does not have 'normal' hearing

Front 151

When a hearing aid sounds weak, hollow, distorted, or intermittent, the first check is:

Back 151

a weak battery

Front 152

An otoscope helps when cleaning the:

Back 152

receiver

Front 153

When a hearing aid is dead, you can check receiver and microphone function by:

Back 153

turning the instrument to telecoil

Front 154

A hearing aid that works with the battery door slightly open, but shuts off when you close the door has:

Back 154

wires touching the battery

Front 155

You CANNOT use feedback checks when:

Back 155

checking the telephone coil

Front 156

An earhook damper is plugged when, during a feedback check:

Back 156

the instrument feeds back only when the coupler is removed

Front 157

A sign of a dirty volume control is:

Back 157

intermittent static

Front 158

Reduction of background noise can be improved by:

Back 158

directional microphones

Front 159

When a new hearing instrument has feedback at the patient's comfortable level, the problem is usually:

Back 159

too much wax in the ear canal

Front 160

An ITE or Canal aid has internal feedback when:

Back 160

the receiver tubing is not completely sealed to the sound bore