433A Rigging and Hoisting 2

Question 1

When inspecting wire rope, which condition requires immediate removal from service per CSA standards?

Accepted Answer

Six randomly distributed broken wires in one lay length

Answer

Six randomly distributed broken wires in one lay length is a standard rejection criterion indicating significant loss of rope integrity that makes continued use unsafe.

Question 2

What does the D/d ratio describe in wire rope and sheave applications?

Accepted Answer

The ratio of sheave or drum diameter to wire rope diameter

Answer

The D/d ratio compares the diameter of the drum or sheave (D) to the diameter of the wire rope (d); a higher ratio reduces bending fatigue and extends rope service life.

Question 3

A bolt-type shackle pin must always be:

Accepted Answer

Fully threaded in and secured with a cotter pin or moused with wire

Answer

The shackle pin must be fully inserted and properly secured to prevent it from unscrewing under load rotation, vibration, or dynamic forces.

Question 4

How is a 'critical lift' defined in most Canadian provincial safety regulations?

Accepted Answer

A lift where failure could cause serious injury, death, or major property damage, typically requiring a written lift plan

Answer

A critical lift is defined by the potential severity of consequences if it fails; it typically requires a formal written lift plan and may require engineering sign-off.

Question 5

What is 'two-blocking' in overhead crane operations?

Accepted Answer

The hook block rising until it contacts the upper head block, creating a sudden shock load

Answer

Two-blocking occurs when the hook block is hoisted until it strikes the upper head block, which can instantly snap the wire rope or cause catastrophic structural failure.

Red Seal Millwright 433A Practice Test

Red Seal Millwright 433A Practice Test

433A Rigging and Hoisting 2