NCCCO Service Truck Crane Operator 4 5

Question 1

What is a 'critical lift' as defined by NCCCO standards for service truck cranes?

Accepted Answer

A lift that exceeds 75% of the crane's rated capacity or involves unusual hazards requiring a written plan

Answer

Critical lifts typically involve loads exceeding 75% of rated capacity or unusual conditions, requiring a pre-lift plan and additional safety measures.

Question 2

Which type of wire rope defect requires the rope to be removed from service immediately?

Accepted Answer

Six randomly distributed broken wires in one lay or three broken wires in one strand in a single lay

Answer

Per ASME B30.5 and OSHA standards, six randomly distributed broken wires in one lay or three in one strand requires immediate removal from service.

Question 3

A service truck crane's rated capacity is reduced to 85% when operating on outriggers extended to mid-span. What does this reduction account for?

Accepted Answer

Reduced stability compared to fully extended outriggers

Answer

Partially extended outriggers provide less lateral stability than fully extended ones, so rated capacity is derated to maintain an adequate safety margin.

Question 4

When using a service truck crane to make a tandem lift with two cranes, who is responsible for directing the combined lift?

Accepted Answer

A designated lead operator or lift director who coordinates both cranes

Answer

Tandem lifts require a designated lift director to coordinate both cranes simultaneously and prevent uneven load distribution or communication failures.

Question 5

What hazard does 'two-blocking' create during a service truck crane operation?

Accepted Answer

The load block contacts the boom tip, causing wire rope failure or structural damage

Answer

Two-blocking occurs when the load block contacts the boom tip sheave, putting enormous stress on the wire rope that can cause sudden failure.

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

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

NCCCO Service Truck Crane Operator 4 5