PASMA Stability and Outriggers 2

Question 1

What is the 'overturning moment' of a tower scaffold?

Accepted Answer

The tendency of the tower to tip over, calculated as the horizontal force multiplied by the height at which it acts

Answer

The time it takes to dismantle the tower

Answer

The weight of the tower

Answer

The time between inspections

Question 2

What is the 'restoring moment' and why is it important?

Accepted Answer

The counteracting force created by the tower's own weight about the opposite base edge that resists overturning

Answer

A moment of rest during the work shift

Answer

The time to restore a damaged tower

Answer

A break taken after an accident

Question 3

When must stabilisers or outriggers be fitted to a tower scaffold?

Accepted Answer

Whenever the manufacturer's instructions require them, typically when the tower exceeds the freestanding height-to-base ratio

Answer

Only when the tower is above 20 metres

Answer

Only when requested by the client

Answer

Stabilisers are never mandatory

Question 4

What is the effect of wind on an unattended tower scaffold left fully erected?

Accepted Answer

Wind can create sufficient force to overturn the tower, especially if sheeting or boards increase the wind-catching area

Answer

Wind has no effect on metal towers

Answer

Wind only affects wooden towers

Answer

Wind can only move the tower if the brakes are released

Question 5

How does adding materials and tools to the platform affect tower stability?

Accepted Answer

It raises the centre of gravity and increases the overturning moment, reducing stability

Answer

It has no effect

Answer

It always improves stability by adding weight

Answer

It only matters if the materials are flammable

Question 6

What is a 'ballast' in relation to tower scaffold stability?

Accepted Answer

Additional weight placed at the base of the tower to lower the centre of gravity and increase stability

Answer

A type of scaffold fitting

Answer

A brand name for outriggers

Answer

A type of castor wheel