Hearing Conservation

Question 1

What is effective quiet?
Continuous noise?
Interrupted noise?
Intermittent noise?
Time-varying noise?

Answer 1

Noise that:

• is too soft to cause TS
• remains above EQ
• is on for long periods above EQ
• is broken up by short breaks of EQ
• stays above EQ but varies over time

Question 2

What is impulse noise?

What is impact noise?

Answer 2

• Transient noise produced by the sudden release of energy and exceeds 140dBSPL
• Transient noise caused by impact between objects and is usually less than 140dBSPL

Question 3

What is equivalent level?

Answer 3

Measurement taken when noise varies in duration and intensity during a period of time

Question 4

The equivalent level for a 24 hour period is expressed as:

Answer 4

Leq(24)

Question 5

Noise surveys collect a time-weighted average to identify which employees are exposed to greater than or equal to _ dBA TWA

Answer 5

85 dbA TWA

Question 6

What is a sound level meter?

Answer 6

Measures the magnitude of sound in a single moment

Question 7

What is a Dosimeter?

Answer 7

Device used to record the amount of sound exposure that accumulates over an entire work day

Question 8

Recovery from noise exposure is expected to occur within _ hours after the noise ends

Answer 8

16 hours

Question 9

Recovery can be delayed if the noise is intermittent, lasts longer than 8-12 hours, or if the temporary threshold shift is greater than _ dB

Answer 9

40 dB

Question 10

The weakest SPLs that cause a temporary threshold shift are 75 to 80 dB for _ noise

Answer 10

Broadband noise