NCCCO Mobile Crane Operator Fundamentals 3

Question 1

What happens to a crane's rated capacity as the working radius increases?

Accepted Answer

Rated capacity decreases as working radius increases

Answer

Rated capacity increases proportionally with radius

Answer

Rated capacity remains constant regardless of radius

Answer

Rated capacity doubles when the radius is doubled

Question 2

What is the maximum allowable side loading on a mobile crane boom?

Accepted Answer

Side loading is not permitted — booms are designed for vertical loads only

Answer

Up to 10% of the rated vertical load

Answer

Up to 5% of the rated vertical load

Answer

Side loading is permitted up to 25% of rated capacity

Question 3

In the context of crane operations, what does 'working radius' refer to?

Accepted Answer

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

Answer

The maximum boom length the crane can safely use

Answer

The distance from the crane's front outrigger to the load

Answer

The vertical height from the ground to the load hook

Question 4

What is the purpose of outrigger pads (cribbing) when setting up a mobile crane?

Accepted Answer

To distribute the concentrated outrigger load over a larger ground area

Answer

To protect the crane's outrigger floats from rust and corrosion

Answer

To lock the crane in position and prevent travel during lifts

Answer

To raise the crane's ground clearance for better visibility

Question 5

Which of the following crane configurations typically provides the highest rated lifting capacity?

Accepted Answer

Outriggers fully extended on firm, level ground

Answer

Outriggers fully retracted, operating on rubber tires

Answer

Outriggers partially extended at 50% extension

Answer

Outriggers removed entirely to reduce crane weight

Question 6

What does the term 'load moment' mean in crane operation?

Accepted Answer

The product of the load weight multiplied by the working radius

Answer

The time required to safely lift and place a load

Answer

The force exerted on the ground by the crane's tracks or outriggers

Answer

The maximum speed at which a load can be safely raised or lowered