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