CAOHC Study Guide 2024 Latest Update 2024- 2025 115 Questions and 100% Verified Correct Answers Guaranteed A+ At First Attempt
- CORRECT ANSWER: State and local requirements must MEET or EXCEED federal
standards.
OHC/Employers must follow MOST
DOD different than OSHA- more proactive; 3 dB Exchange Rate, lower PEL.
15. State and local requirements - CORRECT ANSWER: must MEET or EXCEED
federal standards
18. - CORRECT ANSWER: PEL - 90 dBA 8 hour TWA- above that needs HP; Action
Level:-85dBA or greater 8 hour TWA -requires employer to start HCP and make HPDs available. Exchange Rate - 5db US; 3dB Europe and some professional groups.
20. - CORRECT ANSWER: To find out an individual's noise exposure, DOSIMETRY is
best.
- - CORRECT ANSWER: Weighting scales when measuring noise: dbA-used for
regulatory OSHA compliance in hearing conservation
- - CORRECT ANSWER: You have 6 months to establish a baseline but if you use a
mobile service, you have ONE YEAR to establish the baseline!
24. - CORRECT ANSWER: If you are exposed to greater than 90dBA, youi must wear
hearing protection. If you have a shift, different hearing protection must be fit and employee must be retrained in their use. If you are exposed to between 85-90dBA, you are in HCP but do NOT have to wear HP UNLESS you have a shift in hearing. Then you MUST be fit and trained to use hearing protection.
25. - CORRECT ANSWER: Sound is described by its frequency, amplitude and
temporal characteristics (steady state, intermittent, impact/impulse),
- - CORRECT ANSWER: Frequency is measured in cycles per second (cps) or Hertz;
Amplitude of Sound Pressure Level is measured in decibels (dB).
27. - CORRECT ANSWER: Decibels are NOT linear and cannot be added. Two sound
sources cannot be added nor 2 HPDs. .
28. - CORRECT ANSWER: Aubible frequencies at birth 20-20,000 cps. Audible
amplitude level approx 0 dB to 120 dB. 1 / 2
29. - CORRECT ANSWER: Who diagnoses ear disease? ....An ENT!
30. - CORRECT ANSWER: Outer ear (pinna/auricle) collects sound and provides
resonant amplification. Middle ear (ossicles- hammer, anvil, stirrup) is an acoustic transformer, provides pressure equalization and protects inner ear. Inner Ear codes intensity and frequency of sound on basilar membrane and sends signal to brain up 8th Cranial Nerve -Auditory Nerve.
31. - CORRECT ANSWER: The Eustachian tube provides drainage and keeps pressure
equal with the outside.
- - CORRECT ANSWER: The semi-circular canals control your balance. Also called
labrynth.
- - CORRECT ANSWER: Conductive loss - usually treatable; usually flat wave form
and worse in lower frequencies. Sensorineural is usually NOT
- - CORRECT ANSWER: Medical causes of hearing loss: Cerumen, Infection,
Eustachian tube dysfunction, diseases of the ossicles -otosclerosis. These cause
CONDUCTIVE LOSSES.
- - CORRECT ANSWER: Presbycusis: hearing loss as a result of age.
Sociocusis/loss from noisy society. Hyperacusis/overly sensitive to sound..
36. - CORRECT ANSWER: Best hearing - 1-4kHz, Speech - 250-4000Hz, Required test
frequencies -500Hz - 6kHz (8kHz is BEST PRACTICE); NIHL - 3-6kHz.
37. - CORRECT ANSWER: Audiometric tests provide the cornerstone to your HCP.
38. - CORRECT ANSWER: Audiometry is the term used to describe formal
measurement of hearing.
39. - CORRECT ANSWER: Hearing testing is a means of evaluating an individual's
overall hearing function
40. - CORRECT ANSWER: Visual exam NOT required before audio but GOOD
PRACTICE id. Contraindications for performing test, documents size and shape of ear canal for earplug fitting. .
41. - CORRECT ANSWER: Give examples of some questions you need to ask on a
aural history form?
- - CORRECT ANSWER: Never test someone with hearing aids in. Take out and test.
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