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PH 136 > Noise Pollution > Flashcards

Noise Pollution Flashcards

1
Q

Differentiate acoustic waves fr sound waves

A

We can’t hear all acoustic waves, but we can hear all sound waves.

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2
Q

Differentiate sound from noise.

A

Not all sounds are noises.

noise = Unwanted sound or sound that is loud, unpleasant or unexpected; disagreeable or undesired sound

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3
Q

non-steady noise vs impulsive noise. What is the difference?

A

time duration

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4
Q 
identify type of noise: Noise with negligibly small fluctuations of sound pressure level within the period of observation.
A. steady noise
B. fluctuating noise
C. intermittent noise
D. impulsive noise
A

A

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5
Q 
Which are the subtypes of non-steady noise? Differentiate the two.
A. steady noise
B. fluctuating noise
C. intermittent noise
D. impulsive noise
A

B and C

B.Fluctuating Noise - variations are always above the background noise
C.Intermittent Noise - variations sometimes go below the background noise

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6
Q 
noise for which the level changes continuously and to a great extent during the period of observation
A. steady noise
B. fluctuating noise
C. intermittent noise
D. impulsive noise
A

B

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7
Q 
Consists of one or more bursts of sound energy, each of a duration less than about 1 second.
A. steady noise
B. fluctuating noise
C. intermittent noise
D. impulsive noise
A

D

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8
Q 
Classify noise accdg to source.
A. peeling of fruits
B. automobiles
C. generator sets
D. hospitals
A

A. domestic
B. commercial
C. industrial
D. commercial

commercial: goods, services DELIVERY
industrial: PRODUCTION

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9
Q

Frequency where human hearing is most sensitive @ hearing

A

500-6000 Hz

but humans can hear from 20-20,000 Hz

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10
Q

Enumerate 3 things to consider in sound measurement

A
  1. Frequency content of the sounds (higher frequency,
    more harmful to humans)
  2. Overall sound pressure levels
  3. Variations of these levels with respect to time.
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11
Q

False about sound pressure
A.raw measurements xpressed in terms of decibels
B.measured on a logarithmic scale
C.measure of vibrations in the air which make up sound

A

A

Expressed in terms of a datum pressure corresponding to the lowest sound pressure which the young normal ear can detect, now called the sound pressure level, Lp (or SPL).

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12
Q

main purpose of sound weighting

A

to determine the relative strengths of frequency components making up a particular environmental noise.

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13
Q 
Which sound weighting technique is the most common?
A. A-Weighting
B. B-Weighting
C. C-Linear Frequency Weighting
D. D-Linear Frequency Weighting
A

A

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14
Q

False about A-Weighting
A. Weights high frequencies as less important than mid-
and low-range frequencies.
B. Tries to approximate the frequency response of our
hearing system.
C. Prioritize certain frequencies

A

A

low frequencies - less priority

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15
Q

False about C- Frequency Weighting
A. Used to determine a time-integrated “peak” level with a time constant of no more than 0.05 ms.
B. used if the actual instantaneous pressure cannot be determined
C. for consistently soft noises

A

C

loud dapat

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16
Q

Pain threshold for noise – approx. __

give a range!

A

120-130 dB

17
Q

Maximum of ___ -
acceptable for occupational noise in PH

Give value & frequency

A

90 dB (for 8 hrs/day or 40 hrs/week) i

18
Q

differentiate fast-response from slow-response measuring instrument for noise

A

Fast-response – time constant of 0.125 s; intended to approximate the time constant of the human hearing system.
Slow-response – time constant of 1 second; intended to make it easier to obtain an approximate average value of fluctuating levels from simple meter readings.

19
Q

Constant noise → __
Varying noise levels → __
(Slow-response, Fast-response)

A

 Constant noise → Fast-response

 Varying noise levels → Slow-response

20
Q

Measuring instruments for noise are placed where?

A

nearest people, at the ear level.

21
Q 
sound level meters: laboratory reference standard
A.Type 0 
B.Type 1 
C.Type 2 
D.Type 3
A

A

22
Q 
sound level meters: general field application
A.Type 0 
B.Type 1 
C.Type 2 
D.Type 3
A

C

23
Q 
sound level meters: field noise survey
A.Type 0 
B.Type 1 
C.Type 2 
D.Type 3
A

D

24
Q 
Which does not increase because of noise?
A. respiratory rate
B. metabolic rate
C. pupillary size
D. number of RBCs
A

D

25
Q 
Which is not a non-auditory health effect of noise pollution?
A.nervous pain
B.buzzing in the ears
C.somnolence
D.Stress induced gastritis
A

C

sleeplessness dapat

26
Q

identify: temporary loss of hearing after going from loud place to a quiet one

A

Transient threshold shift

27
Q

As age increases, ability to hear decreases. what is this called?

A

presbycusis

28
Q

differentiate reactive from dissipative muffler

A

reactive - low freq/small exhausts

dissipative - high frew/large exhausts

29
Q

what is reverberation control?

A

Addition of sound absorbing material to reverberant

spaces to reduce reflected noise fields

30
Q

differentiate emission from immersion

A

Emission – generation

Immision – injection or addition

31
Q 
Which area requires quietness (i.e. hospital)?
A. AA
B. A
C. B
D. C
E. D
A

A

32
Q 
Which area is for residential purposes?
A. AA
B. A
C. B
D. C
E. D
A

B

33
Q 
Which area is a light industrial area?
A. AA
B. A
C. B
D. C
E. D
A

D

34
Q 
In eng'g measures to control noise, give one example of:
A. source modification
B. transmission reduction
C. passive protection
D. traffic management
A

A - low noise road surface, changing engine
B - enclosures around machinery, noise screen
C - ear muffs, insulation of dwelling
D - speed limit, electronic guidance of traffic flow

PH 136 (18 decks)

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