Cpcs Practice Test & Exam Prep | United Kingdom

What is the principal operational difference between a trolley (saddle) jib tower crane and a luffing jib tower crane?

A trolley jib stays horizontal while a trolley moves the hook; a luffing jib raises and lowers the entire jib to alter hook radius. A trolley jib can rotate 360 degrees, whereas a luffing jib is fixed in slew direction. A luffing jib has no hoist rope and uses hydraulic cylinders directly to lift loads. A trolley jib can only be mounted on traveling bases, while a luffing jib must be static.

Correct Answer:

A trolley jib stays horizontal while a trolley moves the hook; a luffing jib raises and lowers the entire jib to alter hook radius.

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