NCCCO Crane Type Identification and Applications 2

Question 1

What is the primary advantage of an all-terrain crane over a rough terrain crane?

Accepted Answer

All-terrain cranes are designed for both highway travel at highway speeds and off-road operation, while rough terrain cranes require transport by trailer for road travel

Answer

All-terrain cranes have higher capacity than rough terrain cranes at all radii

Answer

All-terrain cranes are always less expensive to operate

Answer

All-terrain cranes do not require outriggers for lifting

Question 2

A crawler crane is selected for a long-duration heavy industrial lift. What is the main advantage of a crawler crane in this application?

Accepted Answer

Crawlers provide a very stable platform with high lifting capacity and can travel slowly with a suspended load over prepared surfaces

Answer

Crawler cranes can travel on public roads without permits

Answer

Crawler cranes require no ground bearing considerations

Answer

Crawler cranes are the fastest type of crane to set up

Question 3

A boom truck (service truck crane) is most appropriate for which type of work?

Accepted Answer

Service and maintenance work requiring moderate lifts and utility of the truck body for material transport

Answer

Large heavy lifts over 50 tons requiring maximum reach

Answer

High-rise building construction where the crane must climb with the building

Answer

Lifts in restricted areas where outriggers cannot be deployed

Question 4

What distinguishes a tower crane from a mobile crane in terms of how it achieves its lifting radius?

Accepted Answer

Tower cranes use a rotating horizontal jib with a trolley that travels in and out to change radius, while mobile cranes use an inclined boom that is raised or lowered to change radius

Answer

Tower cranes use a telescoping boom while mobile cranes use a fixed jib

Answer

Tower cranes can only lift directly overhead; mobile cranes can reach outward

Answer

Tower cranes have no rated capacity limits; mobile cranes are limited by their outrigger spread

Question 5

What is the primary difference in how an overhead bridge crane (EOT crane) achieves load movement compared to a mobile crane?

Accepted Answer

Overhead cranes travel on fixed runway rails mounted to the building structure, providing longitudinal, transverse, and vertical movement within a defined work envelope

Answer

Overhead cranes use an outrigger system for stability

Answer

Overhead cranes require a boom angle indicator for operation

Answer

Overhead cranes can only lift loads up to 5 tons

Question 6

Which crane type uses a lattice boom structure rather than a telescoping hydraulic boom, and what is the primary reason for choosing lattice construction?

Accepted Answer

Lattice boom cranes (crawler, lattice boom truck, luffing tower) use truss structure because lattice provides the highest strength-to-weight ratio for very long boom lengths and maximum capacities

Answer

Lattice boom cranes include all hydraulic telescoping cranes for rough terrain use

Answer

Lattice booms are only used on cranes below 10 tons capacity

Answer

Telescoping booms are always stronger than lattice booms of the same length