NCCER Crane Operations & Safety Procedures 3

Question 1

A load chart shows a crane's capacity as '75,000 lbs at 30 ft radius.' What does the radius refer to?

Accepted Answer

The horizontal distance from the crane's centerline of rotation to the center of the load

Answer

Load radius is measured horizontally from the crane's center of rotation (swing center) to the center of the suspended load.

Question 2

What action should a crane operator take if wind speed exceeds the crane manufacturer's operational limit?

Accepted Answer

Cease operations and secure the crane

Answer

Operations must stop when wind exceeds manufacturer limits because excessive wind creates unpredictable side loads that can tip the crane.

Question 3

Which of the following is a function of a crane's outriggers?

Accepted Answer

Providing a stable base and increasing load capacity

Answer

Outriggers extend the crane's support base, improve stability, and allow higher load capacities than on rubber tires.

Question 4

What is a 'critical lift' in crane operations?

Accepted Answer

A lift exceeding 75% of the crane's rated capacity or involving special hazards

Answer

Critical lifts exceed 75% of rated capacity or involve unusual hazards such as lifting over power lines or occupied structures.

Question 5

When should a rigger or signal person be used for a crane lift?

Accepted Answer

Whenever the operator does not have a clear view of the load or path of travel

Answer

A signal person is required whenever the operator cannot see the load, path of travel, or landing zone throughout the entire lift.

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