433A Rigging and Hoisting 3

Question 1

What is a spreader bar (spreader beam) primarily used for in rigging?

Accepted Answer

To maintain sling leg separation and keep legs vertical, reducing compressive forces on the load

Answer

A spreader bar holds the sling attachment points apart so the sling legs remain near-vertical, preventing the inward compressive forces that angled slings would impose on a fragile load.

Question 2

What is the standard CSA/ASME hand signal for 'hoist' given to a crane operator?

Accepted Answer

Index finger pointing upward with a circular motion of the hand and forearm

Answer

The standard hoist signal is an index finger pointed upward with the hand and forearm making a circular (winding) motion, mimicking the crane drum rotation.

Question 3

What is the maximum fleet angle generally accepted for wire rope spooling onto a hoist drum?

Accepted Answer

2° 30'

Answer

A maximum fleet angle of 2° 30' is the industry-accepted limit; exceeding it causes excessive rope wear, cross-winding on the drum, and premature rope failure.

Question 4

When rigging a load with an off-centre (eccentric) centre of gravity, where must the crane hook be positioned?

Accepted Answer

Directly above the load's centre of gravity

Answer

The crane hook must be directly above the load's centre of gravity; any offset will cause the load to tilt until the CG hangs directly beneath the hook.

Question 5

What does a proof load test on rigging hardware verify?

Accepted Answer

The hardware can withstand a load greater than its WLL without permanent deformation

Answer

A proof load test applies a load (typically 2× WLL) to verify the hardware will not permanently deform, confirming its rated capacity and structural integrity.

Red Seal Millwright 433A Practice Test

Red Seal Millwright 433A Practice Test

433A Rigging and Hoisting 3