Haad exam for Audiologist 3 DHA MOH DHCC

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MOH DHA HAAD EXAM PRACTICE QUESTIONS

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Please Like and Subscribe so that we can make more videos for you ! Thank you ! 21. The correct answer is (C). The guidelines clearly indicate that A B R is the screening tool to be used in the neonatal intensive care unit (N I C U). For an infant in the well-baby nursery, O A E can be used for screening, but A B R could also be used. (D) and (E) is incorrect because A S S R is not a recommended screening tool. (A) and (B) are incorrect because O A E is not recommended for use in the N I C U. 22. The correct answer is (C). 35 d B A or less and 0.6 second or less capture the recommendations for any core learning space with an enclosed volume below 10,000 cubic feet. (A) and (B) are incorrect because the noise levels indicated are stricter than the recommendations, which were designed for practical application in school settings. (D) is incorrect because by the A N S I guidelines, the classroom acoustics indicated would exceed the recommended noise levels for an unoccupied classroom. Also, the acoustics indicated by (B) and (D) would allow reverberation times that exceed the recommendations for classrooms. 23. The correct answer is (A). The patient is complaining that loud sounds are too loud, which suggests that the M P O is set higher than the patient’s loudness discomfort level. When the M P O is set too high, loud input levels continue to receive additional gain, which makes loud inputs too loud. (B) is incorrect because a narrow dynamic range means the M P O is likely set lower than it should be, reducing the usable range of audibility available to the patient. A narrow dynamic range and low M P O setting typically negatively affect speech understanding and would not make loud sounds such as door slams sound uncomfortably loud. If the problem was the occlusion effect, the patient would be complaining that his or her own voice was too loud, not external sounds. In fact, if the patient was experiencing the occlusion effect, sounds such as doors slamming may actually sound more comfortable. Therefore, (C) is incorrect. The directivity index is a measurement that quantifies the amount of directionality provided by the polar plot of the hearing aid. A low directivity index implies poor directionality and typically poor speech understanding. It is not a direct measure of loudness. Therefore, (D) is incorrect. 24 The correct answer is (C). Decreasing the output compression threshold effectively lowers the M P O of the hearing aid so that loud sounds do not receive any additional gain above the output compression threshold. Setting the output compression threshold below the patient’s loudness discomfort level ensures that loud sounds are not too loud. (A) is incorrect because using expansion adjusts gain for soft sounds, not loud sounds. (B) is incorrect because using frequency lowering focuses on adjusting the frequency range where gain is applied rather than on the level of gain adjustment. (D) is incorrect because decreasing the input compression ratio results in decreasing gain for soft sounds rather than loud sounds. 25. The correct answer is (B). Starting at 34 d B, intensity will increase by 3 d B each time the number of sources is halved. So going from 1 to 2 sources/fans will increase the intensity from 34 d B to 37 d B A. Doubling the number of sources again, from two to four sources/fans, will increase the intensity another 3 d B to 40 d B A. (A) is incorrect because mathematically starting at 39 d B A and increasing twice by 3 d B will bring the total to 45 d B A, which exceeds the allowable maximum of 40 d B A. (C) is incorrect because mathematically starting at 28 d B A and increasing twice by 3 d B will bring the total to 34 d B A, which is below the allowable maximum of 40 d B A. (D) is incorrect because mathematically starting at 20 d B A and increasing twice by 3 d B will bring the total to 26 d B A, which is below the allowable maximum of 40 d B A. 26. The correct answer is (A). The thin or absent bony covering of the superior semicircular canal (S S C) allows pressure from the external auditory canal to be transferred to and stimulate the S S C, resulting in dizziness. (B) is incorrect because tinnitus is not associated with S S C D. (C) is incorrect because a persistent feeling of spinning is not associated with S S C D. Dizziness with S S C D is intermittent and associated with loud sounds or pressure changes. (D) is incorrect because difficulty walking is not associated with S S C D. 27. The correct answer is (C). c V E M P s are myogenic responses elicited by acoustic stimulation of the otolithic organs, specifically, the saccule. The saccule is innervated by the inferior branch of the vestibular nerve, which has been shown to project to the lateral vestibular nucleus, the origin of fibers that descend by way of the lateral vestibular tract to anterior horn cells, which affect the contraction of the sternocleidomastoid muscle, the source of c V E M P s. (A) is incorrect because bithermal calorics activate the horizontal semicircular canal, which is innervated by the superior branch of the vestibular nerve. (B) is incorrect because the head shake test activates the horizontal semicircular canals, which are innervated by the superior branch of the vestibular nerve. (D) is incorrect because o V E M P s are thought to be generated by acoustic activation of the utricle, which is innervated by the superior branch of the vestibular nerve. 28. The correct answer is (C). Localization in the horizontal plane (which is the task required to locate voices in a group) is based on the spatial cues of interaural time and intensity. (A) is incorrect because pinna filtering is not distorted with in-thecanal hearing aids, and pinna cues are primarily used for vertical localization. (B) is incorrect because ear-canal resonance is not eliminated by hearing aids; ear-canal resonance is altered by hearing aids. (D) is incorrect because divided attention is not needed to locate a single source. 29. The correct answer is (D). SNR loss is defined as the increase in signal-to-noise ratio required by a listener to obtain a 50% correct score as compared to normal performance. Listeners with normal hearing achieve a 50% correct score at a 2 dB SNR. Therefore, if the person with a hearing loss requires the signal to be at 12 dB, the SNR loss is calculated by subtracting 2 dB (normal performance) from 12 dB (impaired performance). (A) is incorrect because 12 minus 2 is not −4 dB, and an SNR loss of −4 dB implies excellent speech perception. (B), and (C) are incorrect because they do not give the correct levels. 30. The correct answer is (B). The case description specifies manufacturing, which falls under general industry and therefore under the authority of the Occupational Safety and Health Administration. (A) is incorrect because the National Institute for Occupational Safety and Health (N I O S H) is an advisory institute that does not make regulations. (C) is incorrect because the Mine Safety and Health Administration does not establish regulations for manufacturing. (D) is incorrect because the Federal Railroad Administration does not establish regulations for manufacturing.