IHS Exam with Complete Solutions

In general, mold modifications are as follows: - ANSWER-Venting affects lows, damping the midrange and horn effects boost highs. Basic verification involves: - ANSWER-checking MCL and UCL in quiet and noise. Sound field is - ANSWER-a controlled environment The configuration and height of the tympanogram can be a factor in deciding the proper matrix for the fitting of a hearing aid: - ANSWER-A high Type A tells us to decrease the output by 2-3 dB You cannot use feedback checks when - ANSWER-checking the telephone coil Verification procedures: - ANSWER-Check the accuracy of your fitting. The problems produced by excessive ambient noise are - ANSWER-greater for the lower frequencies than the higher frequencies The decibel is - ANSWER-a ratio between two intensities REUR measurement are taken in - ANSWER-an open human ear canal When a hearing aid is dead, you can check the receiver and microphone function by: - ANSWER-turning on the instrument telecoil The dividing line between the external and middle ear is the - ANSWER-tympanic membrane The cochlea, acting as a frequency analyzer, distributes acoustic stimuli to places along the basilar membrane according to frequency. This forms the basis of a hypothesis called the: - ANSWER-Place Theory An organic disorder is when there is damage to: - ANSWER-The hearing mechanism, the neural pathways and the brain. The speed of sound in air, in feet per second, is : - ANSWER-1100 Properly selected hearing instruments should allow: - ANSWER-The patient to wear an instrument at a comfortable loudness level, improved communication and have better hearing aided. Crystal microphones and receivers: - ANSWER-are very fragile Which of the following is not a coupler used for measuring hearing aid performance? - ANSWER-Zwisks Ear Simulator Small diameter tubing of SIA hearing aids has the effect of : - ANSWER-reducing the high frequency gain The function of a microphone is to : - ANSWER-convert acoustic energy into electrical energy Vent an earmold : - ANSWER-is the most common modification made on an earmold When a new hearing instrument has feedback at the patients comfortable level, the problem is usually: - ANSWER-too much wax in the ear canal With SIE-S hearing aids: - ANSWER-The only signal is from the hearing aid and phrase effects from a vent are not an issue. The most comfortable level is: - ANSWER-About 45 dB HL or 65 dB SPL for normal ears Any complex sound can be broken down into individual frequencies by a technique known as: - ANSWER-Fourier Spectral analysis The adult ear canal: - ANSWER-rises upward and forward, then descends to the drum. An effective verification is: - ANSWER-a measure able improvement in communication Which of the following is not included in correct test protocols? - ANSWER-plugging the hearing aid vent to control feedback Most conducive losses: - ANSWER-Are medically correctable, display a breakdown or obstruction in middle ear and display good discrimination The T position on a hearing aid switch can be used to - ANSWER-amplify a telephone conversation, couple hearing aid into a loop inductor, couple directly into the audio of a radio or tv The following components can change or modify the frequency response of a hearing instrument: - ANSWER-a microphone Afferent fibers: - ANSWER-transmit from the cochlea to the brain. User satisfaction must include: - ANSWER-patient preferences The following measurements use SPL as a reference: - ANSWER-Probe microphones, sound field aided thresholds, and ANSI specifications