DRC - Noise

What is the main purpose of Damage Risk Criteria (DRC)?

• To assess the impact of noise on wildlife
• To regulate the use of personal protective equipment
• To measure the intensity of noise exposure
• To determine the maximum allowable noise exposure levels

What is the concept of permissible exposure level (PEL) in relation to DRC?

• Maximum allowable noise exposure considered to be one full dose of noise
• Minimum noise exposure level for safety
• Noise exposure level that varies based on age
• Average noise exposure level over a 24-hour period

What does Percentage Risk (PR) measure in the context of DRC?

• The duration of noise exposure
• The frequency of noise exposure
• The total number of individuals exposed to noise
• Difference between the percent of individuals exposed to noise who reach impairment and those not exposed

What is the maximum noise exposure limit set by OSHA for 8 hours?

• 90 dBA
• 85 dBA
• 95 dBA
• 100 dBA

What is the 5 dB trading rule based on?

• Equal-risk principle
• Equal-energy concept
• Equal-TTS principle
• Equal-exposure concept

What was demonstrated by Fletcher and Munson in 1933 through the equal loudness curves?

• The human ear is more sensitive to middle frequencies than lower frequencies
• The human ear is more sensitive to high frequencies than middle frequencies
• The human ear is not sensitive to low frequencies
• The human ear is equally sensitive to all frequencies

Why is the A-weighted sound level frequently used in the context of hearing conservation?

• It gives a good estimation of the threat to human hearing
• It is less accurate than other weighting options
• It is easier to calculate
• It emphasizes high frequencies

Which frequency weighting option is commonly used in the context of hearing conservation?

• A-weighted
• F-weighted
• C-weighted
• D-weighted

How can noise exposure interact with other exposures to augment hearing loss?

• With temperature changes
• With sunlight exposure
• With ototoxins and vibrations
• With humidity levels

What is the main purpose of conducting noise measurements in the context of hearing conservation?

• To monitor employee productivity
• To evaluate if employees are following safety protocols
• To identify the loudest machines in the workplace
• To determine if noise levels are hazardous to safety and hearing