NCCCO Crane Operations & Safety Procedures 4

Question 1

When performing a critical lift (load exceeding 75% of the crane's rated capacity), what is required before the lift begins?

Accepted Answer

A written critical lift plan approved by a qualified person

Answer

OSHA 1926.1433 requires a written critical lift plan reviewed and approved by a qualified person before any critical lift is performed.

Question 2

What action should a crane operator take if they receive a stop signal from anyone on the job site?

Accepted Answer

Stop the load immediately regardless of who gave the signal

Answer

A stop signal must be obeyed immediately regardless of who gives it—this is a universal safety rule for crane operations.

Question 3

What is the minimum safe distance a crane must maintain from an energized power line of 50 kV or less during operations?

Accepted Answer

10 feet

Answer

OSHA 1926.1408 requires a minimum clearance of 10 feet from energized power lines rated 50 kV or below.

Question 4

During a tandem lift (two cranes lifting one load), who is responsible for directing the overall operation?

Accepted Answer

A qualified lift director designated in the lift plan

Answer

OSHA requires a qualified lift director to be designated and in charge when two or more cranes are used to hoist a single load.

Question 5

A crane's load chart shows a capacity of 20 tons at a 30-foot radius. If the boom angle is reduced, increasing the radius to 40 feet, what generally happens to the rated capacity?

Accepted Answer

The capacity decreases as radius increases

Answer

As the load radius increases (boom angle decreases), rated capacity decreases due to increased moment arm forces on the crane.

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

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

NCCCO Crane Operations & Safety Procedures 4