CAOHC Noise Measurement and Control 3

Question 1

What does a noise dose of 200% indicate about a worker exposure?

Accepted Answer

The worker received twice the maximum allowable daily noise exposure

Answer

The worker was exposed to 200 dBA

Answer

The sound level meter was improperly calibrated

Answer

The worker needs a hearing test repeated twice

Question 2

What is the purpose of noise contour mapping in a workplace?

Accepted Answer

To create a visual representation of noise levels across the facility for identifying high-exposure areas

Answer

To measure each individual worker personal noise exposure

Answer

To determine the frequency content of machinery noise

Answer

To calculate the building acoustic insulation rating

Question 3

Which engineering control technique reduces noise by preventing vibration transmission between machinery and structures?

Accepted Answer

Vibration isolation using resilient mounts or pads

Answer

Acoustic absorption panels on walls

Answer

Administrative rotation of workers

Answer

Increasing the distance between workers and equipment

Question 4

What is the threshold level setting on a noise dosimeter and why is it important?

Accepted Answer

The minimum sound level below which the dosimeter does not accumulate dose, set at 80 dBA for OSHA

Answer

The maximum level the dosimeter can measure

Answer

The sound level at which the alarm activates

Answer

The calibration reference level

Question 5

How does doubling the distance from a point noise source affect the sound level in a free field?

Accepted Answer

Sound level decreases by approximately 6 dB

Answer

Sound level decreases by approximately 3 dB

Answer

Sound level decreases by approximately 10 dB

Answer

Sound level remains unchanged

Question 6

What does the term criterion level mean in noise dosimetry?

Accepted Answer

The constant noise level that produces a 100% dose over the measurement duration

Answer

The maximum peak level the dosimeter can measure

Answer

The noise level at which hearing damage first occurs

Answer

The background noise level in the test environment