SMSTS Equipment and Tools Knowledge 3

Question 1

Hand-arm vibration syndrome (HAVS) is caused by prolonged use of vibrating tools. Which tool category typically presents the greatest risk?

Accepted Answer

Petrol-powered concrete breakers used daily

Answer

Petrol-powered concrete breakers produce high-magnitude vibration and are used for extended periods, maximizing HAVS exposure.

Question 2

Under the Control of Vibration at Work Regulations 2005, what is the daily Exposure Action Value (EAV) for hand-arm vibration?

Accepted Answer

2.5 m/s²

Answer

The EAV for hand-arm vibration is 2.5 m/s² A(8), above which employers must take action to reduce exposure.

Question 3

A grinder disc shatters during use. Which of the following would most likely have prevented this?

Accepted Answer

Checking the disc's maximum RPM matches or exceeds the grinder's no-load speed

Answer

Using a disc with a maximum RPM lower than the grinder's speed causes over-spinning, leading to disc failure and fragmentation.

Question 4

What is the function of a residual current device (RCD) on a construction site?

Accepted Answer

It disconnects the circuit within milliseconds if a fault current is detected

Answer

An RCD detects current imbalance caused by earth faults and disconnects power in milliseconds, preventing electrocution.

Question 5

A forklift truck is to be used on a public road to move materials between two site compounds. What is required?

Accepted Answer

The vehicle must be road registered, insured, and the driver must hold a valid driving licence

Answer

Using a forklift on a public road requires road registration, insurance, and a valid driving licence as it becomes a road vehicle under the Road Traffic Act.

(SMSTS) Site Management Safety Training Scheme Practice Test

(SMSTS) Site Management Safety Training Scheme Practice Test

SMSTS Equipment and Tools Knowledge 3