Free C-259 Practice Questions

Question 1

A Crosby S-279 machinery eyebolt is fully tightened, but the plane of its eye does not align with the planned angular pull. A fitter backs it out until the eye aligns, leaving a gap beneath the shoulder. Thread engagement remains adequate, and the angular load is within the applicable reduced rating. How should the alignment be corrected?

Accepted Answer

Install the manufacturer's specified alignment shims so the eye aligns with the shoulder fully seated.

Answer

Retighten the eyebolt and let the connecting shackle accommodate the out-of-plane pull.

Answer

Leave the eye aligned and secure the raised shoulder with a locknut above the load.

Answer

Fit a higher-capacity eyebolt in the same backed-out position to increase the load margin.

Question 2

Four equal-length chain-sling legs connect a common master link to four lugs on a rigid machine base. The lugs are nominally at the same elevation, but there is no load-equalizing device. Which assumption would make the capacity assessment unreliable?

Accepted Answer

Each leg will carry exactly one-quarter of the load because the nominal lengths match.

Answer

The manufacturer's load-sharing conditions apply when using the complete assembly's rated capacity.

Answer

The rated capacity must be checked at the sling-leg angles used in the lift.

Answer

The upper master link carries the resultant force from the connected sling legs.

Question 3

An inspection of a single-part wire-rope sling records eight broken wires within one rope lay. Six of those breaks are in the same strand; the other two are in different strands. Under 29 CFR 1910.184(f)(5)(i), which entry belongs in the inspection record?

Accepted Answer

Remove from service; the concentration of breaks in one strand exceeds the limit.

Answer

Retain for lifting; the total is below ten broken wires in one rope lay.

Answer

Retain at reduced capacity; the intact strands can compensate for the damaged strand.

Answer

Defer the decision; count the breaks over the full sling length before judging serviceability.

Question 4

A lever hoist is being used to pull a supported machine into alignment. Its manufacturer permits horizontal pulling. The required force is within its rating, the anchorage is suitable, both hooks are loaded in their bowls, and the force acts along the straight hook-to-hook line. A coworker objects that any nonvertical use is side loading. The correct response is to:

Accepted Answer

Use it as arranged; the approved pulling direction follows the hook-to-hook load path.

Answer

Reduce its working load limit by half to compensate for the horizontal orientation.

Answer

Suspend the hoist vertically and redirect its load chain over a nearby structural member.

Answer

Replace it with an electric hoist, because manual hoists are restricted to vertical service.

Question 5

A hoist with a 3,000-lbf load-hook rating hangs from a support rated for 2,750 lbf. The hoist itself weighs 250 lbf. Below its load hook are a 2,300-lbf machine, a 200-lbf spreader, and 100 lbf of other rigging. All other components are adequate. Which static load check correctly evaluates the hoist and its support?

Accepted Answer

2,600 lbf at the load hook and 2,850 lbf at the support; the support is overloaded.

Answer

2,300 lbf at the load hook and 2,550 lbf at the support; both ratings are adequate.

Answer

2,850 lbf at the load hook and 3,100 lbf at the support; the support is overloaded.

Answer

2,600 lbf at the load hook and 2,600 lbf at the support; both ratings are adequate.

Question 6

A wire-rope sling's tag lists 5,000 lbf for a vertical hitch and 4,000 lbf for a choker hitch at choke angles of at least 120 degrees. A planned choker lift carries 3,400 lbf at a measured choke angle of 135 degrees. The choke seats on the sling body, and inspection, bend geometry, and load restraint meet the manufacturer's requirements. How should the rigger use the tag?

Accepted Answer

Use the 4,000-lbf choker rating directly; the stated choke angle is covered without another hitch reduction.

Answer

Reject the lift because a choker must remain below half the sling's vertical rating.

Answer

Apply the choker reduction again to the tag's 4,000-lbf value.

Answer

Apply the 5,000-lbf vertical rating because the free upper sling segment is vertical.

Question 7

A Crosby shackle will remain in a rigging connection for a long maintenance campaign. The connected sling can move against the pin and cause it to rotate. The shackle's size and load rating have already been verified. Which arrangement follows Crosby's recommendation for this service?

Accepted Answer

A bolt-type shackle with the specified nut and cotter installed.

Answer

A screw-pin shackle backed off slightly to let the sling move freely.

Answer

A screw-pin shackle tightened at installation and left for the duration.

Answer

A round-pin shackle selected instead because its pin contains no threads.

Question 8

During a low trial lift with an overhead-crane hoist, a machine remains level and its slings do not move on the load. When the operator releases the hoist control, the lower hook and machine continue steadily descending together. The controls still allow a controlled landing on the cribbing directly below. Which diagnosis and response best fit these observations?

Accepted Answer

The hoist is failing to hold; land the load and remove the hoist from service.

Answer

The load is seeking its center of gravity; land it and reposition the lifting points.

Answer

The sling eyes are seating; hold the load low until the downward movement stops.

Answer

The gearing is taking up backlash; cycle the hoist controls until the movement settles out.

Question 9

A conventional spreader is suspended by two upper sling legs attached near its ends. Separate lower slings hang vertically from those ends to the load. In this arrangement, the spreader's principal structural action is:

Accepted Answer

Axial compression, because the upper sling forces push inward at the spreader's ends.

Answer

Axial tension, because the separated load attachment points pull the spreader's ends apart.

Answer

Bending from a central upper suspension point, as in a conventional lifting beam.

Answer

Torsion, because the two upper sling legs apply equal forces at opposite ends.

Question 10

A sling manufacturer's material requisition calls for Peerless Grade 100 bulk chain with a catalog axial working load limit of at least 6,000 lbf and a nominal trade size no larger than 10 mm. The catalog lists: 5510223 - 7 mm, 4,300 lbf; 5510323 - 8 mm, 5,700 lbf; 5510423 - 10 mm, 8,800 lbf; 5510623 - 13 mm, 15,000 lbf. Which part number meets both material requirements?

Accepted Answer

5510423

Answer

5510223

Answer

5510323

Answer

5510623

Free C-259 Practice Questions

Domain 1: Hooks and eyebolts

Question 1

Domain 2: Shackles

Question 2

Domain 3: Manual hoists

Question 3

Domain 7: Choker sling

Question 4

Domain 8: Bridle sling

Question 5

Domain 9: Spreader beams

Question 6

Domain 10: Wire rope slings

Question 7

Domain 12: Adhering to rigging safety rules

Question 8

Domain 13: Identifying rigging components given a part number

Question 9

Domain 14: Calculating load weight and balance

Question 10

The rest of the C-259 blueprint

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