MASS Load Charts and Capacity 4

Question 1

A load chart shows a gross capacity of 20,000 lbs at the working radius. The hook block weighs 500 lbs and rigging weighs 300 lbs. What is the net capacity available for the load?

Accepted Answer

19,200 lbs

Answer

Net capacity = 20,000 − 500 − 300 = 19,200 lbs available for the actual load.

Question 2

A lift requires picking a 15,000 lb load. With deductions the net capacity is 16,000 lbs. The load utilization is closest to:

Accepted Answer

About 94%

Answer

15,000 ÷ 16,000 ≈ 0.94, or roughly 94% of available capacity.

Question 3

If a load weighs more than the net capacity at the current radius, the operator should first try to:

Accepted Answer

Reduce the radius by booming up so a higher capacity column applies

Answer

Bringing the load closer (shorter radius) generally raises the rated capacity available.

Question 4

A crane is rated at 30,000 lbs at 10 ft radius and 12,000 lbs at 30 ft radius. This illustrates that capacity is most sensitive to:

Accepted Answer

Changes in load radius

Answer

The large drop from 30,000 to 12,000 lbs shows how strongly radius affects rated capacity.

Question 5

When two chart values bracket your actual radius (e.g., your radius falls between listed 25 ft and 30 ft rows), you should:

Accepted Answer

Use the capacity for the next larger (longer) radius

Answer

Always round to the longer radius, which gives the more conservative, lower capacity.

MASS Test Practice Test

MASS Test Practice Test

MASS Load Charts and Capacity 4