CAOHC Exam Questions with Correct Answers

CAOHC Exam Questions with Correct Answers Unprotected exposure to hazardous noise causes: - answerTemporary and/or permanent hearing loss Temporary and/or permanent tinnitus (ringing, buzzing in ears) Occupational noise sources - answerAgriculture, mining, railroads • Manufacturing - largest hazardous noise-exposed population • Machinery, weapons, vehicles, tools, equipment Noise-Induced Illness: - answerhearing loss and tinnitus Occurs gradually, over time, from repeated exposures Noise-Induced Injury: - answerhearing loss and tinnitus Occurs from one significant exposure or event Recreational noise sources - answerLawn care, power tools, equipment, firearms, music, motorcycles AUDITORY EFFECTS OF NOISE EXPOSURE - answerLoss of hearing sensitivity • Tinnitus • Missing parts of conversation • Slower, inaccurate localization • Increased errors, safety mishaps Non-auditory effects of noise exposure - answerRaise blood pressure • Raise heart rate • Increase stress hormone levels • Disrupt healthy sleep patterns • Result in possible reassignment to a different job • Result in embarrassment, frustration, and social withdrawal 4 P'S OF NOISE-INDUCED HEARING LOSS (NIHL) - answer1)Painless 2) Progressive 3) Permanent 4) Preventable Purpose of hearing conservation program - answer• Prevent occupation-related NIHL • Job retention • Reduce costs of hearing loss: > $240 million per year • Promote healthy hearing and quality of life HCP major elements - answer- noise hazard assesment - noise controls - audiometric monitoring -hearing protection devices -hearing conversation education -recordkeeping -program evaluation CAOHC MISSION - answerAdvancing best practices in occupational hearing conservation worldwide, through credentialing, standards, education, and advocacy. CAOHC VISION - answerA world without occupational hearing loss engineering controls - answerprimary means to reduce or control noise, dampen, enclose, or isolate noise - use HOD obly after engeneering controls prove unfeasible administrative controls - answerpolicies and procedures implemented to reduce noise exposure -standard operating proceedures (shift rotation, time in noise limitations) VA COHC scope of practice - answerIn accordance with VHA DIRECTIVE 1170.02 Checks and calibration of audiometric instrumentation • Otoscopic screening and pure-tone air conduction threshold testing, for the purpose of a hearing conservation program • Otoscopy and pure-tone air conduction threshold testing without interpretation for established patients • Proper fitting and training of various personal hearing protection devices • Basic counseling of employees concerning hearing conservation test results and employee referral sound - answerany pressure change or vibration tht is propagated in a medium vibration - answersound source causes alternating presssure chances in the air molecules sound wave - answercompressoin+rarefraction compression - answermolecules are forced together causing areas of high pressure, mediums become compressed rarefaction - answermolecules separate from each other causing areas of low negative pressure, medium becomes more spread out sound wave - answera series of pressure changes in compression and rarefaction cycles that transfer energy sine waves - answergraphic representaion of the simplest sound wave, whih is a single frequency, or a pure tone constnt intensity complex sounds - answerconsists of many frequencies 2 parameters that make noise hazadours is - answerintensity and time noise damage frequency range - answer3k-6k most sensitive area of sound detection in humans - answerhz dB SPL - sound pressure level - answerthe amount of sound energy in the atmosphere around us dB HL - answer- built into audiometer and reflected on audiograms - determined by testing the hearing of a large group of young normal hearing people and averaging the resu