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CAOHC_Chapter 2 EXAMS (1)
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CAOHC_Chapter 2 EXAMS (1)
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CAOHC_Chapter 2 EXAMSWhich is true about the characteristic of sound called "frequency"?
a. It describes the loudness of a noise source
b. It is measured in decibels
c. It is measured in Hz
d. It is considered low when under 2000Hz - ANS-c. It is measured in Hertz
Which of the following is true about amplitude and intensity of sound?
a. It is measured in Hertz
b. It is measured in decibels
c. It only refers to impulse noise
d. It is measured in frequency - ANS-b. It is measured in decibels
An impulse or impact sound can best be described in all these ways except:
a. an intense sound with short duration
b. a sound that should be quantified in a noise survey
c. a noise lasting less than one second
d. a sound with mostly high frequencies - ANS-d. A sound with mostly high frequencies
An example of a complex sound can best be described as:
a. A decibel reading over 90dB on an A-weighted scale
b. A "pure" tone with amplitude
c. A sound with varying frequency, amplitude, and temporal characteristics
d. The sound in an audiometric test - ANS-C. A sound with varying frequency, amplitude and
temporal characteristics
Temporal characteristics of sound include all of these except:
A. Continuous
B. Intermittent
C. Steady state
D. Pure tone - ANS-D. Pure tone
Noise surveys use decibels to measure sound. Decibels measure:
a. the amplitude of sound
d. weighting networks
c. the weighted scale of frequency
d. only pure tones - ANS-a. the amplitude of sound
Different weighting networks are used in measuring sounds depending on what you are
measuring. Which one of these statements about weighting networks is false?
a. There are three main weighting networks: A, C and Z
, b. "A" is used for calculating hearing protection Noise Reduction Rating(NRR)
c.In "A" weighting, less importance or "weight" is given to low frequencies as it is to high
frequencies
d. Most occupational noise data is presented using the "A" weighted scale - ANS-b. "A" is used
for calculating hearing protection Noise Reduction Rating(NRR)
In measuring sound, "Z" weighting is described by all of the following except"
a. It is unweighted across the human frequency range of 20 to 20,000 Hz
b. It is only used by the military to measure impact sound
c. It is mostly used for measuring impulse sounds like that generated by weapons
d. "Z" measurements are unweighted and therefore referred to as just dB - ANS-b. It is only
used by the military to measure impact sound
The components of a hearing conservation program should include all of the following except:
a. engineering controls to reduce noise levels
b. the use of hearing protection
c. annual audiometric testing
d. annual training to measure noise levels - ANS-d. annual training to measure noise levels
If the sound in an area is currently at 82 dB(A) and another piece of equipment is added with a
sound level of 82 dB(A), what is the best way to determine the new sound level?
a. Add the two numbers for a total of 164 dB(A)
b. Average the two numbers, which is 82 dB(A)
c. Create an equation using the formula provided in the dB(A) table
d. Add the sound levels causing a 3 dB increase for a value of 85 dB - ANS-d. Add the sound
levels causing a 3 dB increase for a value of 85 dB
All of the following statements about time-weighted average are true except:
a. It is often "normalized" to 8 hours
b. it calculates amplitude or dB(A) and the duration of noise exposure
c. it changes if employees work more than 8-hour shifts
d. it is used to determine noise levels that a worker is exposed to at the moment - ANS-d. it is
used to determine noise levels that a worker is exposed to at the moment
According to OSHA, the Action Level(AL) at which workers should be included in a hearing
conservation program occurs when they are:
a. exposed to a consistent sound lebel of 85 dB (A) for an entire 8-hour shift
b. exposed to a sound level of 80db(A) for 7.5 hours and 100 dB(A) for 30minutes
c. exposed to a sound level of 80 dB(A) for 4 days of the week and 100dB (A) for one day of the
week
d. all of the above - ANS-a. exposed to a consistent sound lebel of 85 dB (A) for an entire
8-hour shift
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