CAOHC Exam Questions With 100% Correct Answers 2024, Exams of Advanced Education

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CAOHC Exam Questions With 100%

Correct Answers 2024

CAOHC - Correct Answer-Council for Accreditation in Occupational Hearing Conservation OHC - Correct Answer-Occupational Hearing Conservationist Effects of Noise - Correct Answer-Physiological and Psychological NIHL - Correct Answer-Noise Induced hearing Loss Physiological effects of Noise - Correct Answer-NIHL, tinnitus, heart disease (etc.) Psychological effects of Noise - Correct Answer-Startle, annoy, disrupt (etc.) TTS - Correct Answer-Temporary Threshold Shifts

PTS - Correct Answer-Permanent Threshold Shifts Divisions of the Ear - Correct Answer-Outer, Middle, Inner Conductive Hearing Loss - Correct Answer-Breakdown in transmission of sound through the outer or middle ear Sensorineural Hearing Loss - Correct Answer-Damage to inner ear or nerves that carry signals from inner ear to brain Mixed hearing loss - Correct Answer-Conductive and sensorineural losses takes place simultaneously Outer Ear Structure - Correct Answer-Auricle (pinna) and External Auditory Meatus (Canal) Outer Ear Problems - Correct Answer-Cerumen, Infection, Foreign Body Ossicles - Correct Answer-Malleus, Incus, Stapes

Middle Ear Structures - Correct Answer-Ossicles, Eustachian Tube Middle Ear Problems - Correct Answer-Otitis Media, Perforated membrane Inner Ear Structures - Correct Answer-Cochlea (Hearing), Vestibular System (Balance) Inner Ear Problems - Correct Answer-Noise, Presbycusis Permanent Hearing Loss - Correct Answer-Sensorineural Ototoxins - Correct Answer-Cause sensorineural hearing loss Definition of Sound - Correct Answer-Any pressure change in air, water, or other medium which the human ear can detect What is necessary for Sound? - Correct Answer-Source of Energy, Vibrating body, Medium, Receiver

Frequency - Correct Answer-Pitch Intensity - Correct Answer-Loudness Duration - Correct Answer-Time Range of human hearing - Correct Answer-20 - 20,000 Hz Sound pressure levels (SPL) measurements - Correct Answer- Decibel (dB) 100 dB + 100 dB =? - Correct Answer-103 dB Inverse Square Law - Correct Answer-Double distance from sound source decreases SPL by 6 dB Steady state noise - Correct Answer-Sound that lasts longer than 0.5 seconds Impulse/Impact noise - Correct Answer-Sound that lasts less than 0.5 seconds

A-weighting - Correct Answer-Filters a measured sound to capture sounds considered hazardous. (Excludes some low and high frequency sounds.) 29 CFR 1910.95 - Correct Answer-Noise exposure standard NIOSH - Correct Answer-National Institute for Occupational Safety and Health (part of CDC) OSHA Action Level (AL) - Correct Answer-85 dBA HCP - Correct Answer-Hearing Conservation Program HCP includes: - Correct Answer-Annual training, annual audio monitoring, availability of HPD HPD - Correct Answer-Hearing Protective Devices OSHA Permissable Exposure Limit (PEL) - Correct Answer- dB

TWA - Correct Answer-Time weighted average OSHA exchange rate - Correct Answer-5dB NIOSH/ACGIH exchange rate - Correct Answer-3dB 5 "C's" (barriers) - Correct Answer-Comfort, Convenience, Communication, Cost, Culture Dosimetry - Correct Answer-Calculates noise exposure Standard Threshold Shift (STS) - Correct Answer-Change in hearing threshold, of an average of 10dB or more at 2000/3000/400 Hz. Recordability - Correct Answer-STS of 10dB or more, work related, hearing loss Hearing Threshold Levels (HTL) - Correct Answer-Lowest intensity level to which the subject responds at least 50% of the time.

Functional Calibration - Correct Answer-Listening and visual check Biological calibration - Correct Answer-Daily, conducting audio with known stable thresholds. Bio-acoustic simulator - Correct Answer-Artificial ears used to calibrate microprocessor Acoustical Calibration - Correct Answer-Annually Exhaustive Calibration - Correct Answer-Every 2 years Failed Daily Calirbation causes - Correct Answer-Improper earphone placement on bio-acoustic simulator OSHA HPD Requirements - Correct Answer-Mandatory use at 85 dBA after STS has been confirmed and before baseline Best type of hearing protector - Correct Answer-One that is worn and worn properly

Noise Reduction Rating (NRR) De-rating % - Correct Answer- 50% Earplug Care - Correct Answer-Wash with warm soap and water Earplug check - Correct Answer-Visual, acoustic, tug test Normal Hearing - Correct Answer-0-25 dB Symmetrical Hearing Loss - Correct Answer-(Sensorineural) Unilateral Hearing Loss Causes - Correct Answer-Childhood disease, neuroma (etc.) Asymmetrical Hearing Loss - Correct Answer- Rising Configuration - Correct Answer-Conductive loss

Downward sloping audiogram - Correct Answer-Most common pattern Crossover - Correct Answer-Sound in test ear crosses over through the skull Retesting thresholds conditions - Correct Answer->5 dB difference at 1000 Hz, more than 60dB difference in ears, significant loss at 500 Hz NIOSH Noise exposure record retention - Correct Answer- yrs NIOSH Audiometric record retention - Correct Answer- duration of employment + 30 yrs Audiometric Calibration record retention - Correct Answer- yrs Professional Supervisor - Correct Answer-Physician or Audiologist