CAOHC Hearing Protection Device Fitting 2

Question 1

What is the Noise Reduction Rating (NRR) and how is it used?

Accepted Answer

A laboratory-tested attenuation rating used with a correction formula to estimate real-world protection

Answer

The NRR is derived from laboratory testing under ideal conditions. A correction formula must be applied to estimate real-world protected exposure levels.

Question 2

When fitting foam earplugs, what is the correct insertion technique?

Accepted Answer

Roll the plug into a thin cylinder, pull the pinna up and back, then insert and hold until expanded

Answer

Proper foam earplug insertion requires rolling tightly, pulling the pinna up and back to straighten the canal, and holding in place until fully expanded.

Question 3

What factor most commonly causes hearing protectors to provide less attenuation than their NRR indicates?

Accepted Answer

Improper fit and inconsistent wear by the user

Answer

The primary reason for reduced real-world attenuation is improper fit and inconsistent wearing by employees.

Question 4

What advantage do custom-molded earplugs offer over disposable foam plugs?

Accepted Answer

Consistent fit and attenuation due to being shaped to the individual ear canal

Answer

Custom-molded earplugs provide a personalized and consistent fit that can reduce variability in real-world attenuation.

Question 5

When is dual hearing protection (earplugs plus earmuffs) recommended?

Accepted Answer

When workplace noise exceeds 100 dBA TWA

Answer

Dual protection is recommended when noise levels exceed 100 dBA TWA, as single protectors may not provide sufficient attenuation.

CAOHC - Council for Accreditation in Occupational Hearing Conservation Practice Test

CAOHC - Council for Accreditation in Occupational Hearing Conservation Practice Test

CAOHC Hearing Protection Device Fitting 2