CAOHC Study Questions with Correct Answers

CAOHC Study Questions with Correct Answers Elements of a Hearing Conservation Program - Answer-1. Noise Measurement 2. Engineering and administratice controls 3. Monitoring Audiometry 4. Hearing Protection 5. Employee Training 6. RecordKeeping 7. Progeam Evaluation Compression - Answer-Area of high pressure Rarefaction - Answer-Low pressure stage 3 primary parameter of sound - Answer-1. Frequency 2. Intensity 3. Temporal characteristics Frequency - Answer-= Pitch = Hertz Loudness - Answer-= Intensity = decibel Time Weighted Average (TWA) - Answer-an evaluation of exposures that are time- weighted over an established period. It allows the exposure levels to be averaged generally over an 8-hour time period Linear - Answer-Decibel scale that represents a flat linear response with no weighting auditory ossicles - Answer-malleus (hammer), incus (anvil), stapes (stirrup) outer ear - Answer-auricle (pinna) and external auditory canal middle ear - Answer-auditory ossicles Tympanic membrane Eustachian tube Inner ear - Answer-Semicircular canals Vestibule Cochlea Auditory nerve 3 types of hearing loss - Answer-1. conductive 2. sensorineural 3. mixed conductive loss - Answer-Affect low frequency hearing (primarily at 500 Hx and 1000 Hz) associated with the hearing of vowels Cochlea is not damaged, but has physical blockage or disruption interfering with sound being conducted or transmitted to the cochlea How can conductive hearing loss be treated? - Answer-Usually medically or surgically corrected sensorineural hearing loss - Answer-Due to noise and aging. Generally affect high frequency hearing (2000Hz to 8000Hz) associated with hearing of consonants Cochlea is damaged Loss is usually permanent and irreversible cholesteatoma - Answer-Tumorous growth from collected skin and infection Presbycusis hearing loss - Answer-age related hearing loss noise-induced hearing loss (NIHL) - Answer-Gradually progressive loss of hearing sensitivity due to years of continuous exposure to moderate level harmful noise Most prevalent type of hearing loss in workplace - Answer-N I H L ANSI (American National Standards Institute) - Answer-Outlines common sense components that should be included in all instructions for manual testing Types of calibration - Answer-1. Functional 2. Acoustic 3. Exhaustive Functional Calibration - Answer-Daily Listening and visual check when being used Acoustic Calibration - Answer-- Measuring audiometer function with professional equipment annually by technician exhaustive calibration - Answer-every 2 years Bio-acoustic simulator - Answer-Can be used in place of an actual test subject for functional calibration Basic hearing test used in hearing conservation program is called - Answer-Air conduction noise notch - Answer-refers to the characteristic dip in hearing sensitivity at around 4,000 Hz that is associated with an audiogram for a patient who has noise-induced hearing loss NIHL alone does not produce a loss greater than. in high frequency and dB HYL in the lower frequency - Answer-75dB and 40 dB STS - Answer-Standard Threshold Shift How does Hearing conservation amendment define STS - Answer-Change in hearing relative to baseline audio gram of an average of 10dB or more at 2,3 and 4 Hz in either ear OSHA F/U for STS - Answer-Written notification within 21 calendar days Re-fitting of HPD Retraining in use of hearing protectors Who reviews problem audiograms - Answer-Audiologist, otolaryngologist, or physician What log does OSHA use to record hearing loss and when was it effective - Answer-Log 300 Effective Jan 1 2003 OSHA recordable rate - Answer-STS of 10 25dB HL or greater (no age adjustment) OSHA standard for hearing loss - Answer-29 CFR 1910.95 OSHA retest - Answer-Within 30 days OSHA retest confirms STS, and confirms it is work related, how long do you have to record? - Answer-Within 7 calendar days Otological Referral Criteria for Occuptional Hearing Conservation Program - Answer- American academy of otolaryngology-head and neck surgery developed this system of referral criteria- commonly used by program managers Goal of criteria is to identify significant changes that may not only influence speech communication but may be of medical nature sound level meter - Answer-measures intensity of sound pressure emanating from a source Noise Dosimeter - Answer-Records noise energy to which the employee is exposed to during the work shift. Noise dosimeter are usually representative of employee noise exposure - Answer-ARE NOT When is it easier to use noise dosimeter - Answer-When performing personal noise monitoring Can noise dosimeter be worn by employee - Answer-Yes Booth certifications - Answer-Used sound level meter to determine if hearing testing booth meets required standards. OCTAVE BAND ANALYZER is required Premolded Earplugs - Answer-Made of vinyl/silicone rubber type Durable and flexible Can be reused Needs cleaned