CAOHC 2024 Exam Solutions

CAOHC 2024 Exam Solutions The missions of CAOHC include: - ANSWER- guiding industry on successful implementation of hearing conservation programs NRR calculations are based on an EPA specification that uses a withdrawn ANSI standard. - ANSWER- true Age corrections values are determined by: - ANSWER- Consulting tables published in Appendix F of the regulations Continuous noise is defined as noise lasting longer than: - ANSWER- 1sec Administrative controls to limit noise exposure include which of the following? - ANSWER- Limiting the time a worker spends at a noise source What type of hearing loss can be attributed to noise? - ANSWER- sensorineural State hearing regulations must meet or exceed federal regulations. - ANSWER- true If a daily calibration threshold is off by more than 5 dB, the audiometer must be acoustically calibrated. - ANSWER- true in addition to the OSHA requirements, FRA requires what datum on audiograms? - ANSWER- audiometer model When visually inspecting an ear canal, an otoscope should be held like a hammer. - ANSWER- false No follow-up is required for an STS if a physician determines the loss was not caused on the job. - ANSWER- true Audiometric testing is also known as hearing screening. - ANSWER- false When a worker's exposure reaches the 'action level', the employer must: - ANSWERinclude the worker in the hearing conservation program Which of the following is true about banded earplugs? - ANSWER- They are useful in intermittent noise environments What is the document MSHA requires to report hearing loss incidents? - ANSWERform 7000-1 FRA requires worker training within 180 days of enrollment in a hearing conservation program. - ANSWER- true What is the amount of attenuation achieved when earplugs are worn in combination with earmuffs? - ANSWER- 5 dB more than the higher attenuation of the two devices Which of the following is NOT an occupational noise regulatory body? - ANSWER- CDC Hertz is a unit of? - ANSWER- sound frequency During acoustic calibration no adjustments are made to an audiometer. - ANSWER- true functional hearing loss is also known as pseudohypacusis. - ANSWER- true Which of the following is NOT a datum OSHA requires on audiograms? - ANSWERworkers birthday OSHA defines a 'persistent STS' as an STS lasting more than: 21 days 30 days 45 days 60 days - ANSWER- none of the above What is the first thing you should do when fitting earplugs? - ANSWER- check canal for any occlusions Properly fitted earmuffs should cause the wearer's voice to sound deeper or muffled. - ANSWER- true Which of the following statements regarding NRR are true? Real world attenuation is, on average, about one-third to one-half of the NRR A higher NRR does not accurately reflect better attenuation in the workplace Earplug attenuation varies widely among a group of wearers, regardless of NRR - ANSWER- all of the above Which of the following is a method to verify proper plug insertion? - ANSWER- Acoustic check observing noise level change when cupping hands over ear