Dear Sir
Thanks for participation into the thread and come up with your answers...
Dear Kesava Sir
Expect to get your feedback with a source on web where we can get all the desired results related to occupational noise...
From India
713Thanks for participation into the thread and come up with your answers...
Dear Kesava Sir
Expect to get your feedback with a source on web where we can get all the desired results related to occupational noise...
From India
Dear Neeraj
Thanks you, all the answers you gave are right.
One that is missing from yours can be noted from the answers given below.
SAMPLE QUESTIONS
1. The reference sound pressure is defined as:
O0.00002N/mē
20 ĩa
Both A and B
2. At what frequency are A, B, and C weighting scales equal?
1000 Hz
3. A type II sound level meter has an accuracy of
+/-1 db
4. Determine the total percent dose for the following noise measurements:
1 hour @ 85 dB
3 hours @ 95 dB
0.5 hours @ 105 dB
3.5 hours @ 80 dB
142%
5. What is the cumulative resultant noise exposure (approximately) for three machines with the following noise ratings (hint: use the short cut method)?
1. 89 dB
2. 92 dB
3. 99 dB
100 dB
6. What is the SPL at 200 feet if the SPL at 20 feet is 103 dB?
83 dB
SPL2 = SPL1 + 20 log (d1 / d2)
SPL2 = 103 + 20 log (20/200)
SPL2 = 83 dB
7. At 30 feet away one piece of equipment registers a SPL of 80 dB. A second piece of equipment at 30 feet away registers a SPL of 85 dB. What is the SPL when both units are operating at 30 feet away?
86 dB
8. An Octave Band analyzer is defined as an instrument to determine
the frequency distribution of sound energy
9. Two separate noise sources of 98 dBA and 96 dBA respectively are installed and operated together. What is the combined noise level?
b. 100 dBA
10. Theoretically, the minimum number of sound pressure level measurements needed to determine the sound power output from a non-directional noise source in a free field is
one
11. Which classification of noise is described as: sharp burst of sound, lasting less than 0.5 seconds, and repeated less than 1 time per second?
Impact
12. What is NRR?
The noise reduction rating of hearing protection.
13. Why is audiometric testing required?
To test for any hearing loss during your employment.
14. Where are the Noise Dosimeters to be clipped?
Close to the ear (In to the collar)
Regards,
Kesava Pillai
From India, Kollam
Thanks you, all the answers you gave are right.
One that is missing from yours can be noted from the answers given below.
SAMPLE QUESTIONS
1. The reference sound pressure is defined as:
O0.00002N/mē
20 ĩa
Both A and B
2. At what frequency are A, B, and C weighting scales equal?
1000 Hz
3. A type II sound level meter has an accuracy of
+/-1 db
4. Determine the total percent dose for the following noise measurements:
1 hour @ 85 dB
3 hours @ 95 dB
0.5 hours @ 105 dB
3.5 hours @ 80 dB
142%
5. What is the cumulative resultant noise exposure (approximately) for three machines with the following noise ratings (hint: use the short cut method)?
1. 89 dB
2. 92 dB
3. 99 dB
100 dB
6. What is the SPL at 200 feet if the SPL at 20 feet is 103 dB?
83 dB
SPL2 = SPL1 + 20 log (d1 / d2)
SPL2 = 103 + 20 log (20/200)
SPL2 = 83 dB
7. At 30 feet away one piece of equipment registers a SPL of 80 dB. A second piece of equipment at 30 feet away registers a SPL of 85 dB. What is the SPL when both units are operating at 30 feet away?
86 dB
8. An Octave Band analyzer is defined as an instrument to determine
the frequency distribution of sound energy
9. Two separate noise sources of 98 dBA and 96 dBA respectively are installed and operated together. What is the combined noise level?
b. 100 dBA
10. Theoretically, the minimum number of sound pressure level measurements needed to determine the sound power output from a non-directional noise source in a free field is
one
11. Which classification of noise is described as: sharp burst of sound, lasting less than 0.5 seconds, and repeated less than 1 time per second?
Impact
12. What is NRR?
The noise reduction rating of hearing protection.
13. Why is audiometric testing required?
To test for any hearing loss during your employment.
14. Where are the Noise Dosimeters to be clipped?
Close to the ear (In to the collar)
Regards,
Kesava Pillai
From India, Kollam
Dear Keshav
My hearful gratitude for such an excellent post.
Regarding Q-10 I wish to have a bit more insight - if you can help.
Frankly I did not and am not able to catch the question - even when the answer is 1.
Is it related to SPL monitoring in congested plants?
Again many thanks for excellent post - keep posting. I am going to post these question to our corporate HSE too.
Regards
From India, Mumbai
My hearful gratitude for such an excellent post.
Regarding Q-10 I wish to have a bit more insight - if you can help.
Frankly I did not and am not able to catch the question - even when the answer is 1.
Is it related to SPL monitoring in congested plants?
Again many thanks for excellent post - keep posting. I am going to post these question to our corporate HSE too.
Regards
From India, Mumbai
Dear Neeraj
In measuring sound we divide the field as follows:
Free Fields
Sound radiates from a point source spherically
The power in the sound source is distributed across the surface of the sphere.
No contribution to measured field from reflections.
Reverberant field :
Enclosed or partially enclosed space
Sound reflected repeatedly
Near Field :
Less than one source distance from source
Highly variable change in SPL with distance.
Far Field:
Several source distance away
Predictable sound behavior with distance
Source act as a point source.
Since in a free field there is no contribution to measured field from reflections we need only one reading.
Hope the information is useful
Regards,
Kesava Pillai
From India, Kollam
In measuring sound we divide the field as follows:
Free Fields
Sound radiates from a point source spherically
The power in the sound source is distributed across the surface of the sphere.
No contribution to measured field from reflections.
Reverberant field :
Enclosed or partially enclosed space
Sound reflected repeatedly
Near Field :
Less than one source distance from source
Highly variable change in SPL with distance.
Far Field:
Several source distance away
Predictable sound behavior with distance
Source act as a point source.
Since in a free field there is no contribution to measured field from reflections we need only one reading.
Hope the information is useful
Regards,
Kesava Pillai
From India, Kollam
Community Support and Knowledge-base on business, career and organisational prospects and issues - Register and Log In to CiteHR and post your query, download formats and be part of a fostered community of professionals.
Occupational Safety, Health & Working Conditions Code 2019.pdf
Compensation Benchmarking Survey.doc