HAC Hearing Aid Fitting & Adjustment 3

Question 1

Which compression parameter determines the input level at which the hearing aid transitions from linear to compressed amplification?

Accepted Answer

Kneepoint (compression threshold)

Answer

The kneepoint (or compression threshold) is the input SPL level above which compression begins to reduce gain.

Question 2

A dispensed BTE hearing aid produces occlusion effect complaints. The patient says their own voice sounds 'boomy.' What is the best solution?

Accepted Answer

Switch to an open-fit or vented earmold

Answer

An open fitting or vented earmold allows low-frequency energy from the patient's own voice to escape rather than resonating in the occluded canal.

Question 3

What is the recommended maximum output (OSPL90) verification procedure to ensure the hearing aid will not cause loudness discomfort?

Accepted Answer

Compare OSPL90 to the patient's uncomfortable loudness level (UCL)

Answer

OSPL90 should be set so that the maximum output does not exceed the patient's UCL, protecting against uncomfortable loudness or further hearing damage.

Question 4

Which feature allows a hearing aid to automatically switch programs based on the acoustic environment?

Accepted Answer

Automatic environment classification

Answer

Automatic environment classification uses signal processing algorithms to detect acoustic scene characteristics and seamlessly switch to the most appropriate program.

Question 5

When verifying a hearing aid with probe-microphone measures, the probe tube should be positioned approximately how far from the eardrum?

Accepted Answer

28 mm from the tragus notch

Answer

Positioning the probe tube approximately 28 mm from the tragus notch (about 5 mm from the eardrum) ensures accurate measurement of SPL near the tympanic membrane.

(HAC) Hearing Aid Certification Practice Test

(HAC) Hearing Aid Certification Practice Test

HAC Hearing Aid Fitting & Adjustment 3