Oilers/Plant Tenders (HHC) Civil Service Practice Exam

A guy line is generally used with a __________.

1. Telescopic crane

2. Stiff leg derrick

3. Mobile crane

4. Winching system

The correct answer is: Stiff leg derrick

A guy line is generally used with a stiff leg derrick due to the nature and purpose of this equipment. A stiff leg derrick is designed to lift and lower loads using a system of ropes and pulleys, which can create significant sideways forces when handling heavy weights. To counteract these forces and maintain stability, guy lines are employed. These lines are tensioned from the derrick's mast to the ground or to another secure point to prevent tipping and to ensure that the structure remains upright during operation. This setup enhances the derrick's stability and operational safety, particularly when dealing with substantial loads. In contrast, telescopic cranes, mobile cranes, and winching systems may not require guy lines due to their design and stability mechanisms. For instance, mobile cranes typically have outriggers and counterweights that provide stability without the need for additional support. Thus, the implementation of guy lines is predominantly associated with stiff leg derricks, ensuring safe operation during lifting tasks.