NCCCO Crane Type Identification and Applications 5 — Questions and Answers
Question 1: Which crane type is specifically engineered to pick up a load at one location and carry it to another location while traveling?
- Overhead bridge crane
- Pick-and-carry crane (Correct answer)
- Hammerhead tower crane
- Stiff-leg derrick
Correct answer: Pick-and-carry crane
Pick-and-carry cranes are designed to lift a load and transport it to a new location while driving, without outriggers, making them highly mobile on jobsites.
Question 2: A ship-to-shore (STS) container crane is classified as which general crane category?
- Mobile harbor crane
- Cantilever gantry crane (Correct answer)
- Floating crane
- Slewing tower crane
Correct answer: Cantilever gantry crane
STS cranes are large cantilever gantry cranes that straddle the dock and extend a cantilever boom over the ship to load and unload containers.
Question 3: A boom truck differs from a hydraulic truck crane primarily in that a boom truck:
- Cannot rotate 360° (Correct answer)
- Is not rated for suspended personnel platforms
- Has lower outrigger stability
- Cannot perform picks over the rear
Correct answer: Cannot rotate 360°
Most boom trucks have limited rotation (typically 400° or less), whereas hydraulic truck cranes typically provide full 360° continuous rotation.
Question 4: Which crane is most suitable for erecting precast concrete panels in a confined urban lot where surrounding buildings restrict swing radius?
- Hammerhead tower crane
- Luffing jib tower crane (Correct answer)
- Lattice boom crawler crane
- Rough-terrain crane
Correct answer: Luffing jib tower crane
Luffing jib tower cranes raise and lower the jib to vary radius, minimizing the swing arc and making them ideal for congested urban sites with restricted airspace.
Question 5: What is the key characteristic of a 'Derrick barge' used in offshore oil and gas construction?
- It is self-propelled and uses thrusters for positioning
- It is a crane-equipped vessel used for heavy offshore lifts and pipe-laying (Correct answer)
- It only handles loads up to 50 tons
- It operates exclusively in shallow water
Correct answer: It is a crane-equipped vessel used for heavy offshore lifts and pipe-laying
Derrick barges are large crane-equipped marine vessels used for heavy lifts, jacket installations, and pipe-laying in offshore oil and gas construction.
Question 6: A jib crane wall-mounted in a manufacturing bay is best described as:
- A gantry crane with a fixed bridge
- A slewing jib crane anchored to a wall or column with a pivoting horizontal arm (Correct answer)
- An underhung monorail system
- A floor-mounted pillar crane
Correct answer: A slewing jib crane anchored to a wall or column with a pivoting horizontal arm
A wall-mounted jib crane consists of a horizontal arm (jib) that pivots on a mast or bracket fixed to a wall or column, covering a semicircular work area.
Question 7: In which scenario would a hydraulic all-terrain crane have a significant advantage over a standard rough-terrain crane?
- Lifting in extremely confined indoor spaces
- Traveling long distances on public highways between jobsites at highway speeds (Correct answer)
- Operating in zero-visibility underground tunnels
- Lifting over power lines in rural fields
Correct answer: Traveling long distances on public highways between jobsites at highway speeds
All-terrain cranes are designed with multi-axle highway-capable carriers that allow travel at road speeds, unlike rough-terrain cranes which must be transported by lowboy.
NCCCO Crane Type Identification and Applications 5
Which crane type is specifically engineered to pick up a load at one location and carry it to another location while traveling?