CSCS Noise and Vibration 4

Question 1

What does the Control of Noise at Work Regulations 2005 require employers to carry out?

Accepted Answer

A noise risk assessment to identify workers at risk and determine what actions are needed

Answer

The Regulations require employers to carry out a noise risk assessment where workers are likely to be exposed to noise at or above the lower exposure action value. The assessment must identify who is at risk, the level of exposure, and what measures are needed to comply with the Regulations.

Question 2

Which of the following construction activities is most likely to cause hand-arm vibration exposure?

Accepted Answer

Using a pneumatic breaker to demolish concrete

Answer

Pneumatic breakers (jackhammers) are among the highest vibration magnitude tools used in construction. Other high-risk tools include hammer drills, angle grinders, chainsaws, and needle guns. Employers must assess the vibration magnitude and limit exposure times accordingly.

Question 3

What is the purpose of the SNR (Single Number Rating) on hearing protection?

Accepted Answer

To show the assumed level of noise reduction in decibels that the hearing protector provides

Answer

The SNR is a single figure in decibels that indicates the overall noise reduction provided by a hearing protector under laboratory conditions. In practice, real-world attenuation is typically lower than the SNR, so a real-world factor should be applied when selecting hearing protection.

Question 4

Under the 2005 Noise Regulations, the exposure limit of 87 dB(A) takes into account what factor that the action values do not?

Accepted Answer

The attenuation provided by hearing protection

Answer

The exposure limit value of 87 dB(A) is unique among the three threshold values because it takes into account the noise reduction provided by hearing protection. The action values of 80 and 85 dB(A) are measured without considering any hearing protection worn.

Question 5

What records must employers keep in relation to noise risk assessments?

Accepted Answer

A record of the significant findings of the assessment including the measures taken to comply with the Regulations

Answer

Employers must keep a record of the significant findings of the noise risk assessment, including the identified risks, the workers exposed, the noise levels, and the measures taken to reduce exposure and comply with the Regulations. These records should be reviewed if circumstances change.

CSCS Green Card Practice Test

CSCS Green Card Practice Test

CSCS Noise and Vibration 4