HAC Assistive Listening Device Technology 2

Question 1

Which type of FM system transmitter is most appropriate for use in a large auditorium or lecture hall?

Accepted Answer

Soundfield FM transmitter

Answer

Soundfield FM transmitters distribute amplified sound evenly throughout a large space using multiple ceiling or wall-mounted speakers.

Question 2

A patient reports that their telecoil-equipped hearing aid picks up significant interference from fluorescent lighting. What is the most likely cause?

Accepted Answer

Electromagnetic interference from the lighting ballast

Answer

Fluorescent lighting ballasts emit electromagnetic fields that can be detected by telecoils and perceived as buzzing or humming interference.

Question 3

What does the HAC Act require of wireline telephones manufactured in the United States?

Accepted Answer

They must be compatible with hearing aids in microphone and telecoil modes

Answer

The Hearing Aid Compatibility Act requires wireline telephones to be compatible with hearing aids in both acoustic (microphone) and inductive (telecoil) coupling modes.

Question 4

An infrared ALD system fails to work when a patient moves to a seat near a window with direct sunlight. What is the most likely reason?

Accepted Answer

Sunlight contains infrared radiation that overwhelms the receiver

Answer

Infrared systems are susceptible to interference from bright light sources, including sunlight, which contains infrared wavelengths that can mask the transmitted signal.

Question 5

Which coupling method is used when a patient with a telecoil-equipped hearing aid uses a neck loop connected to an FM receiver?

Accepted Answer

Inductive coupling

Answer

A neck loop creates a magnetic field around the head, and the hearing aid's telecoil picks up this field inductively.

(HAC) Hearing Aid Certification Practice Test

(HAC) Hearing Aid Certification Practice Test

HAC Assistive Listening Device Technology 2