NCCCO Mobile Crane Assembly and Disassembly 2

Question 1

What is the first step that must be completed before beginning mobile crane assembly?

Accepted Answer

Conduct a site survey and ground bearing capacity assessment

Answer

A thorough site survey including ground bearing capacity assessment must be completed first to ensure the ground can support the crane and outrigger loads.

Question 2

When erecting a lattice boom crane, in what sequence should boom sections typically be assembled?

Accepted Answer

From butt section (base) upward toward the tip

Answer

Lattice boom assembly proceeds from the butt (base) section outward toward the tip, with each section connected and pinned before adding the next.

Question 3

What must be verified after installing counterweights during mobile crane assembly?

Accepted Answer

That counterweight quantity and placement matches the load chart configuration being used

Answer

Counterweight configuration must exactly match the load chart being used, as different lift configurations require specific counterweight amounts and positions.

Question 4

Which component should be inspected specifically for proper engagement before the crane is put into service after assembly?

Accepted Answer

All safety devices, limit switches, and anti-two-block systems

Answer

All safety devices including load moment indicators, anti-two-block systems, and limit switches must be tested and verified operational before placing the crane into service.

Question 5

What is the purpose of the boom backstop or boom stop device on a mobile crane?

Accepted Answer

To prevent the boom from traveling past vertical and over-luffing backward

Answer

Boom backstops prevent the boom from exceeding maximum boom angle, which could cause it to tip backward (over-luffing), potentially causing catastrophic structural failure.

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO (National Commission for the Certification of Crane Operators) Practice Test

NCCCO Mobile Crane Assembly and Disassembly 2