NCCCO - National Commission for the Certification of Crane Operators Tower Crane Operator Test 1

Question 1

When a tower crane is climbing (jumping) to gain additional height, who is responsible for supervising and directing the climbing procedure?

Accepted Answer

A qualified and competent person designated by the crane manufacturer or erector

Answer

The general contractor's site superintendent

Answer

Any certified crane operator on site

Answer

The local building inspector

Question 2

What does the anti-two-block (ATB) device on a tower crane prevent?

Accepted Answer

The hook block from colliding with the boom tip or head machinery

Answer

The boom from rotating beyond its rated radius

Answer

The crane from slewing in high wind conditions

Answer

The counterweight from shifting during hoisting

Question 3

On a hammerhead (top-slewing) tower crane, where is the counterweight located?

Accepted Answer

On the opposite end of the jib from the hook, mounted on the counter-jib

Answer

At the base of the mast inside the concrete foundation

Answer

Directly above the cab on a separate mast section

Answer

Suspended below the slewing ring on the mast

Question 4

A tower crane operator receives a signal from a signal person to stop and hold a load. The operator notices the load has begun to drift due to wind. What is the correct action?

Accepted Answer

Hold the load in position and communicate with the signal person before taking further action

Answer

Slowly continue the original travel path to the landing zone

Answer

Lower the load immediately to the ground regardless of below-hook clearances

Answer

Increase hoist speed to get the load to its destination faster

Question 5

What is the primary purpose of the load moment indicator (LMI) on a tower crane?

Accepted Answer

To alert the operator when the combination of load and radius approaches or exceeds the crane's rated capacity

Answer

To display the exact weight of the load in kilograms or pounds

Answer

To calculate wind speed and automatically reduce capacity in high winds

Answer

To record all lifts in the crane's maintenance log automatically

Question 6

During a pre-operational inspection, a tower crane operator discovers a visible crack in a structural chord of the tower mast. What is the required action?

Accepted Answer

Remove the crane from service immediately and notify the competent person and/or manufacturer

Answer

Document the crack in the daily log and monitor it throughout the shift

Answer

Apply a temporary weld repair and continue operations

Answer

Reduce the crane's rated capacity by 10% and continue operations