CSCS Noise and Vibration 3

Question 1

What symptoms may indicate that a construction worker is developing Hand-Arm Vibration Syndrome?

Accepted Answer

Tingling, numbness, or blanching (whitening) of the fingers, especially in cold conditions

Answer

Early symptoms of HAVS include tingling and numbness in the fingers and hands. As the condition progresses, fingers may blanch (turn white) when exposed to cold, known as vibration white finger. Workers may also experience reduced grip strength and dexterity. HAVS is irreversible once established.

Question 2

What type of health surveillance is required for workers exposed to noise above the upper exposure action value?

Accepted Answer

Regular audiometric testing (hearing tests)

Answer

Workers regularly exposed to noise at or above the upper exposure action value of 85 dB(A) must be placed under appropriate health surveillance, which includes regular audiometric testing. This allows early detection of noise-induced hearing loss so that further damage can be prevented.

Question 3

What is the main risk to health from whole body vibration (WBV)?

Accepted Answer

Lower back pain and spinal disorders

Answer

The primary health risk from WBV is lower back pain and damage to the spine. Workers who operate mobile machinery such as dumpers, excavators, and ride-on rollers for prolonged periods are particularly at risk. Proper seat suspension and limiting exposure times are key control measures.

Question 4

How can employers reduce hand-arm vibration exposure on a construction site?

Accepted Answer

Select low-vibration tools, limit exposure duration, keep tools well maintained, and use job rotation

Answer

Effective measures to reduce HAV exposure include selecting tools with lower vibration magnitudes, limiting the duration of exposure through job rotation, ensuring tools are properly maintained (blunt or worn tools vibrate more), using the right tool for the job, and keeping hands warm to maintain blood circulation.

Question 5

At what noise level does an employer have a duty to take action to reduce noise exposure as far as is reasonably practicable?

Accepted Answer

85 dB(A) — the upper exposure action value

Answer

At the upper exposure action value of 85 dB(A), employers must reduce noise exposure to as low a level as is reasonably practicable by means other than hearing protection. This includes engineering controls such as silencers, barriers, and selecting quieter equipment.

CSCS Green Card Practice Test

CSCS Green Card Practice Test

CSCS Noise and Vibration 3