Sound Level Meter

Question 1

What is a confounding factors when measuring personal noise exposure?

Answer 1

variability of noise over time

Question 2

What are examples that affect variability of noise over time?

Answer 2

a) total time of noise exposure, b) changes in noise spectra (intensity and frequency), c) temporal patterns of noise

Question 3

Individual average noise exposure levels are…

Answer 3

primarily dictated by their work cycle

Question 4

To determine individual noise exposure levels, time weighted averages are obtained:

Answer 4

a) for each homogenous group of workers, b) for an entire work shift

Question 5

What is the goal of noise surveys?

Answer 5

obtain best estimate of noise exposure level on a typical work day

Question 6

Best estimates of noise exposure levels are obtained when…

Answer 6

monitoring is close to the most exposed ear

Question 7

Determining personal risk for occupational hearing loss requires…

Answer 7

instrumentation that quantifies and permits computation of an average of changes in sound pressure levels over time

Question 8

Methods of measuring personal noise exposure over time:

Answer 8

a) manual recording, b) automatic recording (integrating SLM)

Question 9

Manual sampling works well with…

Answer 9

continuous steady-state noise

Question 10

A short manual noise sampling of a continuous steady-state noise is…

Answer 10

representative of noise pattern for the day

Question 11

A manual noise sample is used to…

Answer 11

project noise exposure (dose) from a sample

Question 12

Manual sampling with SLM does not work well with:

Answer 12

a) fluctuant noise, b) mobile workers with unpredictable work cycles

Question 13

SLM with manual charting of fluctuant noises can be impractical for these reasons:

Answer 13

a) must follow employee around, b) record sound events associated with different settings and specific SPL, c) requires someone to be present for the duration of the noise survey

Question 14

Accuracy of averaged manual sampling is compromised because:

Answer 14

a) limit of hours that a noise survey can be done, b) a limited number of samples can be obtained, c) noise level information between samples will be missed

Question 15

A way to automate noise sampling is by using…

Answer 15

integrating sound level meters such as dosimeters

Question 16

Dosimeters provide…

Answer 16

a) an average noise exposure value by integrating noise levels into an ongoing average periodically, b) a single digit value but cannot identify specific noise events/sources for you

Question 17

Integrating SLMs have multiple functions such as:

Answer 17

a) give single number dB or dose values for the time period monitored, b) project time weighted dBA or dose averages for 8 house, c) simultaneously average for a variety of measuring criteria

Question 18

Features of sophisticated integrating sound level meters:

Answer 18

a) have memory and can provide histograms of averages by minutes or hours, b) can get printout of histograms to determine noise cycles, c) cannot get information on specific events unless surveyor is present