Hearing Conservation Program

Question 0

OSHA action level for noise?

Answer 0

85 dBA

Question 1

OSHA requires audiometric testing baseline on employees entered into hearing conservation program within what time frame?

Answer 1

6 months.

OSHA requires audiogram must be performed within 6 months of an employee’s first exposure at or greater than 85 decibels, 8 hours TWA) and annually thereafter.

Question 2

OSHA PEL for noise

Answer 2

90 dBA 8 hour TWA

Question 3

Short term exposure level (STEL) of 115 dBA

Answer 3

15 min

Question 4

Hearing conservation program?

Answer 4

Work site surveillance: visual inspection & noise measurement and analysis
Medical surveillance
Audiometric testing
Engineer control
Hearing protection
Record keeping

Question 5

Which solvent has synergistic effect with noise to hearing lose?

Answer 5

Styrene

Question 6

Physical or chemical agents that have synergistic effects on hearing loss?

Answer 6

Vibration
Organic solvent (styrene)
CO
Ototoxic drugs eg. frusemide
Certain metals

Question 7

Conductive hearing loss?

Answer 7

Disruption of external or middle ear with normal inner ear function

Question 8

Sensorineural hearing loss

Answer 8

Damage medial to stapedial plate
   -cochlear (inner ear)
   -retrocochlear (auditory nerve)
Noise can irreversibly damage hair cells in Organ of Corti
Greater hearing loss at higher frequency
   -usually starts at 4000 Hz (4K notch)

Question 9

Unilateral hearing loss often seeing in what occupation?

Answer 9

Truck drivers (one window opens, close to one year)
Military person or police using firearms

Question 10

Medical disorder that could have unilateral hearing loss?

Answer 10

Acoustic neuroma

Meniere’s in adults

Question 11

Hearing speech is related to a hearing thresholds of

Answer 11

500 to 2000 Hz

Question 12

Noise induced hearing loss classically peaks at ?

Answer 12

4000 Hz

Question 13

Human voice is in the range of ?

Answer 13

300- 700 Hz

Question 14

Human ear can hear frequency in the range of?

Answer 14

20 - 20,000 Hz

Question 15

Human ear is most sensitive in the range of

Answer 15

1000- 4000 Hz

Question 16

The anatomical location of change that results in the Temporary threshold shift is at?

Answer 16

Organ of Corti

A chemical change in the composition of the fluid or a metabolic change in the hair cells themselves

Question 17

What is a STS (standard threshold shift)?

Answer 17

An average shift in either ear of of 10 dB or more at 2000, 3000, and 4000 Hz.

Question 18

At what frequency does noise induced hearing loss first show up on an audiogram ?

Answer 18

3k-6k Hz

Question 19

Anatomical damage of noise induced hearing loss?

Answer 19

Hair cell of inner eat

Question 20

What is the limit of hearing damage, currently suggested by AMA, before compensation should be awarded?

Answer 20

Average of 25 or less at 500, 1000, and 2000 Hz.

If >25 dB loss then compensation is suggested

Question 21

Decibels are measured on a logarithmic scale

Answer 21

Every time you add 5 dB, you double the sound, you need to half the time limit according to OSHA:
90 dB    8 hr
95 dB    4 hr
100 dB  2 hr
105 dB  1 hr
110 dB  30 min
115 dB  15 min

Question 22

Under OSHA standard, a STS (10dB) in either ear must be recorded on?

Answer 22

OSHA 300 log or MSHA Form 7000-1

Question 23

Employer is responsible for record keeping regarding employee noise exposure. How long does the Noise monitoring results need to be kept?

Answer 23

For at least 2 years

Question 24

How long has an employee’s Audio metric results be kept?

Answer 24

It must be maintained for the duration of the employment of the employee plus 30 years.

Question 25

NRR

Answer 25

Noise reduction rating for hearing protection devices:
The higher the number, the greater the protection.
Noises reduction
= (NRR - 7)/2

Question 26

After the determination that a employee’s audiometric test results show an STS, the employer must be notified within how many days?

Answer 26

21 days

Question 27

Is age adjustment necessary for STS?

Answer 27

Yes