Deck 23: Noise and Vibration Hazards

Question 1

Sound is any change in pressure that can be detected by the ear.

Answer 1

True

Question 2

If the maximum permitted exposure level for an 8-hour workday is 87 dB(A), with an exchange rate of 2 dB, what is the exposure limit for 2 hours?

A) 83 dB(A)
B) 85 dB(A)
C) 87 dB(A)
D) 89 dB(A)
E) 91 dB(A)

Answer 2

83 dB(A)

Question 3

Hand-arm vibration syndrome (HAV) is a form of Raynaud's syndrome that afflicts workers who use vibrating power tools frequently over time.

Answer 3

True

Question 4

The fundamental hazard associated with excessive noise is hearing loss.

Question 5

The unit of measurement for sound is the decibel, or one-tenth of a bel.

Question 6

Noise can be eliminated at its source by enclosing the source.

Question 7

Legislation in each Canadian jurisdiction requires that employees be protected from excessive noise in the workplace.

Question 8

Which hearing protection device provides the best filtering of a broad range of frequencies?

A) Enclosures
B) Earplugs
C) Superaural caps
D) Flat-attenuation HPDs
E) Canal-cap-style HPDs

Question 9

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) Sound and vibration can have a wide range of frequencies
E) All of the above

Question 10

Medical professionals have not yet established a procedure for determining if there is a causal relationship between workplace noise and hearing loss.

Question 11

As the duration of the exposure is decreased, the permissible level is decreased.

Question 12

What sound level would most likely be encountered in a quiet office setting?

A) 6 dB(A)
B) 20 dB(A)
C) 50 dB(A)
D) 90 dB(A)
E) 110 dB(A)

Question 13

Fit testing is an important prerequisite for effective noise protection.

Question 14

To decrease the risk of hearing loss, exposure to noise should be limited to a maximum 8-hour, time-weighted average of 90 dB(A).

Question 15

In most Canadian jurisdictions, what level of dB(A) is considered the maximum limit of continuous exposure over eight hour days without protection?

A) 150
B) 115
C) 85
D) 20
E) 3

Question 16

Conducting noise surveys involves measuring noise levels at different locations in the workplace.

Question 17

The exchange rate indicates the increase in sound level that is permitted as the time of exposure is doubled.

Question 18

The threshold of hearing is the maximum level of sound that can be perceived without experiencing pain.

Question 19

The human ear is most sensitive at about 500 Hz.

Question 20

Lex. This is an abbreviation for average exposure level adjusted for an 8-hour day.

Question 21

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) Noise can be reduced at its source through tool selection.
E) All of the above

Question 22

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) Engineering controls
E) Passive noise reduction

Question 23

Which form of noise control is considered to have the least practical application in industrial settings?

A) PPE
B) Engineering controls
C) Administrative controls
D) Sound-absorbing materials
E) Ear muffs

Question 24

Raynaud's syndrome is also known by which term?

A) Noise-induced hearing loss
B) Sensorineural loss
C) Tinnitus
D) Threshold shift
E) Hand-arm vibration syndrome

Question 25

Trying out HPDs to determine how they fit with an individual's anatomical features is known as what?

A) Trial PPE run
B) Fit testing
C) PPE testing
D) PPE run-through
E) Attenuation