Free MASS Test Load Charts and Capacity Questions and Answers 1

Question 1

An operator's load chart indicates a gross capacity of 30,000 lbs for a specific lift. The rigging includes a 750 lb hook block, 450 lbs of slings and shackles, and a 1,200 lb spreader bar. What is the maximum weight of the load (net capacity) that can be safely lifted?

Accepted Answer

27,600 lbs

Answer

Net capacity is calculated by subtracting the weight of all rigging and lifting attachments from the gross capacity listed on the load chart. The calculation is: 30,000 lbs (Gross Capacity) - 750 lbs (Hook Block) - 450 lbs (Slings/Shackles) - 1,200 lbs (Spreader Bar) = 27,600 lbs.

Question 2

On a hydraulic crane's load chart, capacities listed above a bold line or in a shaded area indicate that the lifting limit is based on which factor?

Accepted Answer

The structural strength of the crane's components.

Answer

The bold line on a load chart separates capacities limited by stability (tipping) from those limited by structural strength. Capacities above the line are based on the structural integrity of the boom and other components, where failure could be sudden and catastrophic. Capacities below the line are based on the crane's stability and its resistance to tipping.

Question 3

Which of the following is NOT a required deduction from the gross capacity found on a load chart to determine the net lifting capacity?

Accepted Answer

The weight of the crane's counterweight.

Answer

The counterweight is an integral part of the crane's structure, and its weight is already factored into the load chart's capacity ratings. Deductions are items suspended below the boom tip, such as the hook block, rigging, spreader bars, and even the weight of a stowed jib, as they add to the total load being handled by the boom.

Question 4

A crane operator is told to set up for a lift on a surface with a 3-degree side slope. According to standard industry practice and manufacturers' requirements, how does this affect the validity of the load chart?

Accepted Answer

The load chart is void because it is predicated on the crane being perfectly level.

Answer

Crane load charts are calculated based on the crane being set up on a firm, level surface (typically within 1% grade). Operating on a slope introduces dangerous side loading on the boom and compromises stability, making the load chart values invalid and the lift unsafe. The crane must be leveled before proceeding.

Question 5

When reading a crane's load chart, the term "Gross Capacity" or "Rated Capacity" refers to the total weight that can be lifted at a specific radius and includes which of the following?

Accepted Answer

The weight of the object, all rigging, and the hook block.

Answer

Gross Capacity is the total load the crane can support at a given configuration, as indicated on the chart. This value includes the actual load to be lifted (net load) plus all capacity deductions like the hook block, rigging, spreader bars, etc.

MASS Test Practice Test

MASS Test Practice Test

Free MASS Test Load Charts and Capacity Questions and Answers 1