NCCCO Wire Rope Inspection and Replacement 4

Question 1

When inspecting wire rope on a crane hoist drum, what condition requires immediate removal from service?

Accepted Answer

Two broken wires in one lay on a standing rope

Answer

ASME B30.2 requires removal from service if two or more broken wires are found in one rope lay on a standing rope.

Question 2

What is 'bird caging' in a wire rope and what does it indicate?

Accepted Answer

Outer strands separating and opening up, indicating torsional damage

Answer

Bird caging occurs when outer strands flare outward due to sudden release of tension or shock load, indicating internal structural damage.

Question 3

What is the minimum discard criterion for broken wires in a running rope (reeved over sheaves) per ASME B30 standards?

Accepted Answer

6 broken wires in one rope lay or 3 broken wires in one strand in one lay

Answer

ASME B30 requires removal when a running rope has 6 or more broken wires in one rope lay, or 3 or more broken wires in one strand within one lay.

Question 4

Which internal wire rope condition is most difficult to detect during a visual inspection?

Accepted Answer

Internal corrosion and broken core wires

Answer

Internal corrosion and broken core wires cannot be detected visually from the outside, making them a hidden hazard that requires periodic disassembly or electromagnetic inspection.

Question 5

A crane operator notices a 'kink' in the wire rope. What is the correct action?

Accepted Answer

Remove the rope from service immediately; kinks are a permanent discard criterion

Answer

A kink permanently distorts the wire rope's geometry and weakens it; ASME B30 standards list kinking as an immediate removal-from-service criterion.

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

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

NCCCO Wire Rope Inspection and Replacement 4