NCCER Crane Maintenance, Inspection & Equipment Setup 4

Question 1

What is the minimum fleet angle allowed for wire rope spooling onto a drum without causing damage?

Accepted Answer

No more than 2 degrees for grooved drums, 1.5 degrees for smooth drums

Answer

Excessive fleet angles cause wire rope to cross-wind on the drum, leading to uneven spooling, accelerated wear, and potential for rope damage; ASME limits are 2° grooved and 1.5° smooth.

Question 2

A crane's swing bearing shows visible grease purging from the seal area during normal operation. What does this indicate?

Accepted Answer

Normal condition — grease purging confirms the bearing is being properly greased

Answer

Grease purging from the swing bearing seal during greasing is normal and actually confirms that the old grease is being pushed out and replaced with fresh lubricant.

Question 3

During crane setup on soft or unstable ground, what is the best practice for outrigger pads?

Accepted Answer

Use larger pads or cribbing to distribute load over a greater area, verified by a competent person

Answer

On soft ground, larger or supplemental pads distribute the crane's outrigger loads over a greater area to keep bearing pressure within safe limits for the soil conditions.

Question 4

What is the function of a crane's pawl (ratchet) on the hoist drum?

Accepted Answer

It prevents uncontrolled reverse rotation of the drum under load

Answer

The pawl engages the ratchet wheel on the drum to prevent uncontrolled reverse rotation, serving as a secondary mechanical brake to hold loads if the primary hoist brake fails.

Question 5

When inspecting a hydraulic cylinder on a crane, what condition requires immediate repair?

Accepted Answer

External leakage at the rod seal or piston seal

Answer

External hydraulic leakage at seals indicates seal failure that can cause loss of cylinder force and controlled movement, creating a serious safety hazard requiring immediate repair.

(NCCER Crane) National Center for Construction Education and Research Crane Certification Practice Test

(NCCER Crane) National Center for Construction Education and Research Crane Certification Practice Test

NCCER Crane Maintenance, Inspection & Equipment Setup 4