Part 4.5

Question 1

A person wears an amplification system that consists of one microphone with a receiver in each ear. What does he wear?

a) body-aid
b) simple CROS
c) Y cord
d) BICROS
e) Binaural

Answer 1

c) Y cord

The key is that he is wearing the system. This is a tricky question which refers to an aid hooked on the belt and used like an ipod.

Question 2

Identifying clients and selecting the appropriate masking level with conductive hearing loss is

a) a simple procedure with few problems
b) very difficult without impedance tests
c) only difficult when one ear is non-functioning
d) no problem as long as there is less than 40 dB difference between the two ears

Answer 2

b) very difficult without impedance tests

Impedance tests are excellent for telling you what is happening physically with the ear.

Question 3

A battery achieves its ‘pumping’ action by

a) storing anode and cathode charges in an electrolyte
b) a process called OHMS LAW
c) removes electronics from the storage device
d) separating and holding the positive and negative charges onto two separate terminals

Answer 3

d) separating and holding the positive and negative charges onto two separate terminals

This is basic science

Question 4

The gain of a hearing instrument may be measured at

a) full on gain
b) reference test gain control setting
c) 50 dB input for AGC instruments
d) all of the above

Answer 4

d) all of the above

Question 5

The nerve fibers of the hearing nerve, at the point of maximal stimulation of the basilar membrane, will discharge (i.e. discharge and recover) at the rate of

a) up to 1 KHz, identical to stimulus frequency
b) 1000 times or cycles /sec.
c) 500 times or cycles /sec.
d) 750 times or cycles /sec.

Answer 5

a) up to 1 KHz, identical to stimulus frequency

The ear is alive, it is not a straight mathematical figure. The key is stimulus frequency.

Question 6

The pure tone audiometer is designed so that zero on the attenuator dial represents

a) 0.0002 dynes/cm sq.
b) average normal hearing for that frequency
c) the softest sound that the best ears can hear
d) the level of masking needed for that frequency

Answer 6

b) average normal hearing for that frequency

The machine is designed to test a human.

Question 7

The air conduction test should incorporate masking whenever there is a difference between the air conduction threshold in the test ear and the bone conduction threshold of the nontest ear of

a) 10 dB
b) 20 dB
c) 30 dB
d) 40 dB

Answer 7

d) 40 dB

Memorize the three rules of masking. This is important.

Question 8

The lowest frequency that goes to make up most complex sounds is

a) usually the loudest
b) said to predominate
c) called the fundamental frequency
d) a and c only
e) a, b, and c

Answer 8

e) a, b, and c

Question 9

Interaural attenuation values vary from person to person but it is greater at 250 Hz and less in the higher frequencies

True
False

Answer 9

True

Question 10

The aid is set at the reference test gain position. You have an input of 60 dB SPL from 200-5000 Hz and you express the difference between the input and the output as a curve. What have you measured?

a) full on gain
b) frequency range
c) attack and release times
d) basic frequency response
e) maximum power output

Answer 10

d) basic frequency response

Think your way through the answers. Response relates to curve, and is the only one that makes sense.

Question 11

Most aided measurements, including those done in a sound controlled environment, are ‘sound field’ measurements which can have ‘acceptable’ ambient noise levels of up to

a) 30 dB SPL
b) 40 dB SPL
c) 50 dB SPL
d) 60 dB SPL

Answer 11

b) 40 dB SPL

Straight memorization.

Question 12

The PTA, even when computed from only two frequencies, is a good indication of what the SRT will be

True
False

Answer 12

True

Question 13

Masking is employed during hearing testing to

a) eliminate the ‘automatic finger’ response
b) eliminate participation of the non-test ear
c) improve the threshold sensitivity of the test ear
d) obtain all of the above

Answer 13

b) eliminate participation of the non-test ear

You are trying to make sure sound doesn’t travel across the skull.

Question 14

The spectrum of input signals on the hearing aid microphone

a) is the same for all styles of hearing aids
b) is affected by the head and body of a hearing aid wearer
c) is unaffected by microphone placement
d) is unchanged by the pinna effect of the ear

Answer 14

b) is affected by the head and body of a hearing aid wearer

Visualize what each answer is saying.

Question 15

CROS (non-occluding) type earmolds are useful when it is necessary to significantly reduce frequencies below

a) 250 Hz
b) 500 Hz
c) 1000 Hz
d) 2000Hz

Answer 15

c) 1000 Hz