Chapter Twenty-Two – NOISE AND VIBRATION HAZARDS
TRUE OR FALSE: Place T or F in the space provided.
_____1. Sound is any change in pressure that can be detected by the ear.
_____2. The unit of measurement for sound is the decibel, or one-tenth of a
bel.
_____3. The fundamental hazard associated with excessive noise is hearing
loss.
_____4. Conducting noise surveys involves measuring noise levels at all
locations in the workplace.
_____5. Noise can be eliminated at its source by enclosing the source.
_____6. Federal regulations require that employees be protected from
excessive noise in the workplace.
_____7. Medical professionals have not yet established a procedure for
determining if there is a causal relationship between workplace noise and
hearing loss.
_____8. The threshold of hearing is the maximum level of sound that can be
perceived without experiencing pain.
_____9. Fit testing is not an important prerequisite for e.ective noise
protection.
_____10. To decrease the risk of hearing loss, exposure to noise should be
limited to a maximum 8-hour, time-weighted average of 90 DBA.
_____11. With PPE 6t is not important in most cases.
_____12. Impulsive noise reduction involves reducing peak impulse
transmission based on the use of PESDs.
_____13. The EPA is replacing its method of using a single number to rate
HPDs with a sliding scale showing the low and high range of estimated
protection provided.
MULTIPLE CHOICE: Circle the letter before the correct answer.
1. Sound and vibration are very similar. Which of the following statements
are true?
A. Sound relates to a sensation
B. Vibration is inaudible
C. Vibration is perceived through the sense of touch
D. All of the above
2. What level of DBA is considered the maximum limit of continuous
exposure over eight hour days without protection?
A. 150
B. 3
C. 90
D. 20
3. Identifying and assessing hazardous noise conditions in the workplace
involve which of the following?
A. Conducting periodic noise surveys
B. Conducting periodic audiometric tests
C. Record keeping and follow up action
D. All of the above
4. Noise is distinguished from sound by which of the following factors?
A. Intensity of noise
B. Unwanted sound
C. Type of noise
D. Duration of exposure
5. Noise control strategies include which of the following?
A. Noise can be reduced at the receiver by enclosing the worker
B. Noise can be reduced along its path by moving the source farther
away
C. Noise can be reduced at its source by enclosing the source
D. All of the above
6. Which of the following is the name given to reduction of sound
transmission using materials and/or structural elements?
A. Active noise reduction
B. Parallel noise reduction
C. Structural noise reduction
D. Passive noise reduction
7. Trying out HPDs to determine how they 6t with an individual’s anatomical
features is known as what?
A. Trial PPE run
B. Fit testing
C. PPE testing
D. PPE run through
13. T
7. B
1. De6ne the term sound.
2. What is the di.erence between sound and noise?
Noise is unwanted sound. Consequently, the di.erent between noise
and sound is in the perception of the person hearing it.
3. Di.erentiate between sound and vibration.
4. Describe the relationship between the pitch of sound and the cycle of
sound waves.
5. List and brieCy explain the three broad types of industrial noise.
6. Describe the various physiological problems associated with excessive
noise.
7. List four factors that a.ect the risk of hearing loss from exposure to
excessive noise.
8. At what sound level is it necessary to begin using some type of personal
protection?
10. Give a brief description of OSHA 29 CFR 1910.95, Hearing Conservation
Amendment.
11. What factors do medical professionals consider in making determinations
of causal relationships relating to hearing loss?
12. De6ne the following terms: follow-up, noise survey, audiometric testing.
It is important to follow-up on even the slightest evidence of change
of physiological damage.
Noise surveys are surveys involving noise levels at di.erent
locations in the workplace.
Audiometric testing measures the hearing threshold of employees.
13. List three appropriate follow-up activities when an audiometric test
reveals hearing loss in an employee.
14. Di.erentiate between engineering and administrative controls.
15. What is HAV? How can it be prevented?
16. Explain the four classification of HPDs that are widely used.
17. Explain the main components of an evaluation of a hearing loss
prevention program.