PASMA Stability and Outriggers

Question 1

What is the maximum height-to-base ratio for a mobile tower scaffold used outdoors?

Accepted Answer

3:1

Answer

2:1

Answer

3.5:1

Answer

4:1

Question 2

What is the maximum height-to-base ratio for a mobile tower scaffold used indoors?

Accepted Answer

3.5:1

Answer

2:1

Answer

3:1

Answer

5:1

Question 3

How do outriggers improve the stability of a tower scaffold?

Accepted Answer

They increase the effective base size, thereby improving the height-to-base ratio

Answer

They add weight to the top of the tower

Answer

They make the tower easier to move

Answer

They reduce the overall height of the tower

Question 4

What must outriggers rest on to be effective?

Accepted Answer

Firm, level ground with base plates to spread the load

Answer

Loose gravel

Answer

The tower's own castor wheels

Answer

Nothing — they can be suspended in the air

Question 5

What is the main force that causes a tower scaffold to overturn?

Accepted Answer

A horizontal force (such as wind or pushing) that creates a turning moment about the base edge

Answer

Gravity pulling it straight down

Answer

The weight of the components

Answer

Magnetic forces

Question 6

What effect does working at the edge of a platform have on tower stability?

Accepted Answer

It moves the centre of gravity towards the edge, increasing the risk of overturning

Answer

No effect

Answer

It improves stability by distributing weight evenly

Answer

It only affects stability above 10 metres