Millwright Level 1 Practice Exam

What is the correct ratio of height to distance from the foot of a ladder to the support structure?

1. 3:1

2. 4:1

3. 5:1

4. 2:1

The correct answer is: 4:1

The appropriate ratio of height to distance for placing a ladder is often referred to as the 4:1 rule. This means that for every four feet of height that the ladder reaches, the base of the ladder should be one foot away from the wall or support structure. This guideline is critical for ensuring stability and safety while using a ladder. By maintaining this ratio, the ladder is positioned at an angle that minimizes the risk of slipping or tipping over. An angle of approximately 75 degrees is generally recommended, which is achieved with the 4:1 ratio. For instance, if a ladder extends 16 feet high, the base should be placed 4 feet away from the wall (16 feet ÷ 4 = 4 feet). This principle helps to provide a wide enough base to support the ladder and allows the user to maintain proper balance while working at a height. It's essential for millwrights and other tradespeople to follow these guidelines to ensure safe practices while working with ladders.