NCCCO Crane Type Identification and Applications 3 — Questions and Answers
Question 1: Which crane type is best suited for lifting loads over existing structures without repositioning the crane?
- Carry-deck crane
- Tower crane (Correct answer)
- Telescopic crawler crane
- Overhead bridge crane
Correct answer: Tower crane
Tower cranes are fixed in place with a large working radius, making them ideal for lifting over existing structures on a construction site.
Question 2: A floating crane is used primarily for which type of operation?
- High-rise building construction
- Bridge construction and salvage over water (Correct answer)
- Warehouse material handling
- Underground utility installation
Correct answer: Bridge construction and salvage over water
Floating cranes are mounted on barges or pontoons, making them ideal for marine construction, bridge building, and salvage operations over water.
Question 3: What distinguishes a level luffing crane from a standard luffing jib tower crane?
- It can travel on rails
- The hook maintains a constant elevation as the jib angle changes (Correct answer)
- It requires no counterweight
- It uses only wire rope with no sheaves
Correct answer: The hook maintains a constant elevation as the jib angle changes
A level luffing crane is designed so the load hook travels horizontally at a constant height when the jib is raised or lowered, reducing load swing.
Question 4: Which crane configuration uses a mast supported by guy wires and a rotating boom at its base?
- Hammerhead tower crane
- Guy derrick (Correct answer)
- Deck-mounted crane
- Knuckle boom crane
Correct answer: Guy derrick
A guy derrick consists of a vertical mast held by multiple guy wires with a rotating boom pivoting at the mast base, commonly used in steel erection.
Question 5: An articulating (knuckle boom) crane is most commonly found in which application?
- Offshore platform construction
- Truck-mounted material delivery and placement (Correct answer)
- Deep mine shaft hoisting
- Shipyard gantry operations
Correct answer: Truck-mounted material delivery and placement
Knuckle boom cranes are typically truck-mounted and used for precise material placement during delivery, thanks to their folding articulated boom design.
Question 6: Which crane type is specifically designed to travel on a fixed runway beam suspended from a building's roof structure?
- Gantry crane
- Overhead bridge crane (Correct answer)
- Monorail hoist
- Stacker crane
Correct answer: Overhead bridge crane
Overhead bridge cranes travel along runway beams mounted to a building's structure, spanning the width of the facility to handle materials throughout the work area.
Question 7: What is the primary operational advantage of a self-erecting tower crane compared to a standard flat-top tower crane?
- Greater maximum load capacity
- Faster setup without a separate assist crane (Correct answer)
- Longer maximum jib radius
- Lower wind load profile
Correct answer: Faster setup without a separate assist crane
Self-erecting tower cranes can fold and unfold themselves using hydraulic mechanisms, eliminating the need for a separate mobile crane for assembly.
NCCCO Crane Type Identification and Applications 3
Which crane type is best suited for lifting loads over existing structures without repositioning the crane?