Question 459 Deck General

The correct answer is D) angle of the boom. The boom indicator on a crane is designed to display the angle of the crane's boom. This information is crucial for determining the safe working load capacity of the crane, as the lifting capacity is directly related to the angle of the boom. Knowing the boom angle allows the crane operator to ensure they are operating within the safe limits of the crane's capabilities. The other options are incorrect because they do not accurately reflect the primary function of the boom indicator. The direction of the boom (A) and the length of the boom (C) are typically displayed on other crane indicators, while the lifting capacity (B) is a calculated value based on the boom angle and other factors.