NCCCO Tower Crane Operator

Question 1

Under OSHA 1926 Subpart CC, which foundation requirement applies to a tower crane before erection?

Accepted Answer

The foundation must be designed by a registered professional engineer capable of supporting all static and dynamic loads from the crane

Answer

A standard concrete pad of 4-inch thickness is sufficient for any tower crane

Answer

The ground bearing capacity must only be checked visually by the operator

Answer

No foundation requirement — tower cranes must be anchored to the structure only

Question 2

A tower crane's free-standing height limit is 180 feet. The project requires the hook to reach 250 feet. What must be done before exceeding the free-standing limit?

Accepted Answer

The tower crane must be tied to the structure with anchor ties at manufacturer-specified intervals before exceeding the free-standing height

Answer

Increase the counterweight by 20% and operate in free-standing configuration

Answer

Use a longer jib to provide additional hook height without increasing tower height

Answer

Request a variance from OSHA to exceed the free-standing limit

Question 3

What is the purpose of the tower crane's anti-collision system on a multi-crane jobsite?

Accepted Answer

To prevent two cranes from swinging into the same zone simultaneously, avoiding structural collision between booms, jibs, or loads

Answer

To prevent overloading by monitoring the combined weight of all cranes

Answer

To ensure both cranes are operated by certified operators

Answer

To synchronize hoist speeds between cranes on tandem lifts

Question 4

Tower crane operators must verify wind speed before and during operations. At what wind speed must most tower cranes cease lifting operations?

Accepted Answer

At the manufacturer's maximum wind speed limit, typically 35 to 45 mph for operational use and lower for erection/dismantling

Answer

100 mph — tower cranes are designed for hurricane-force winds

Answer

Cranes may operate at any wind speed as long as a signal person is present

Answer

Wind speed limits only apply during erection and dismantling, not normal operation

Question 5

During tower crane erection, OSHA requires the process to be directed by a qualified person. What qualifications define this person?

Accepted Answer

A person with recognized degree or professional knowledge, or extensive practical experience, who can identify and solve problems with erection equipment and methods

Answer

Any licensed contractor holding a general contractor's license

Answer

A person with at least 10 years of crane operation experience

Answer

Only the crane manufacturer's factory technician qualifies for this role

Question 6

A tower crane jib load chart shows 25,000 lb at minimum radius and 10,000 lb at maximum jib tip radius. A rigger wants to pick a 24,000-lb load at 80% of maximum jib length. What must the operator verify?

Accepted Answer

Locate the 80% radius row on the load chart and confirm the rated capacity at that exact radius equals or exceeds 24,000 lb

Answer

Proceed since the load is under the minimum-radius capacity of 25,000 lb

Answer

Use the average of tip and maximum radius capacities as the allowable load

Answer

Check only that the load is below the tip capacity