A fixed-jib crane operating in a port quay moves along a semi-circular rail. It can rotate in a full circle, slide along the track and move its lifting hook in or out. In the diagr... A fixed-jib crane operating in a port quay moves along a semi-circular rail. It can rotate in a full circle, slide along the track and move its lifting hook in or out. In the diagrams below, the internal line describes the path taken by the crane, while the external line represents its range of action. In which of the following diagrams does the outer line represent the range of action of the crane?
Understand the Problem
The question describes a fixed-jib crane operating in a port quay and asks you to identify which diagram correctly represents the crane's range of action based on the description provided. The internal line represents the path taken by the crane, and the external line represents its range of action.
Answer
D
The outer line represents the range of action of the crane in diagram D.
Answer for screen readers
The outer line represents the range of action of the crane in diagram D.
More Information
The crane moves along a semicircular rail, can rotate a full circle, and move its lifting hook in or out. Diagram D accurately depicts this range of motion, where the outer line shows the area the crane can reach due to these movements.
Tips
Understanding the constraints of the crane's movement (semi-circular rail, full circle rotation, hook movement) is key to visualizing its range of action.
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