NCCCO Site Hazards & Risk Assessment 5

Question 1

A job hazard analysis (JHA) for a crane lift should be completed by whom?

Accepted Answer

A qualified team including the operator, rigger, lift director, and relevant site personnel

Answer

A comprehensive JHA requires input from all personnel involved in the lift—operator, rigger, and lift director—to identify hazards from all perspectives.

Question 2

Which condition would require immediate suspension of a crane lift in progress due to a site hazard?

Accepted Answer

A sudden increase in wind speed exceeding the crane manufacturer's rated limits

Answer

Wind speeds exceeding the manufacturer's operational limits create an immediate overturning and load control hazard that requires suspending the lift.

Question 3

When cranes work in proximity to one another on a congested site, what is the primary risk that must be managed?

Accepted Answer

Collision between the booms, loads, or counterweights of the cranes

Answer

When multiple cranes operate in overlapping radii, there is a real risk of boom-to-boom, load-to-load, or counterweight collision, requiring strict coordination protocols.

Question 4

What does the term 'critical lift' typically indicate in crane operations?

Accepted Answer

A lift exceeding a certain percentage of the crane's rated capacity or involving unusual risk factors that requires a formal written lift plan

Answer

Critical lifts—commonly defined as lifts over 75% or 85% of rated capacity, or those involving multiple cranes or special hazards—require a detailed written lift plan reviewed by a qualified person.

Question 5

What site condition requires placing timber mats or cribbing under crane outrigger pads?

Accepted Answer

When ground-bearing capacity is insufficient to support the calculated outrigger load without risk of settlement

Answer

Timber mats or cribbing spread the outrigger point load over a larger area to prevent sinking when the native soil cannot support the concentrated load directly.

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

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

NCCCO Site Hazards & Risk Assessment 5