Jan 5th

Question 1

Define a load chart

Answer 1

A load chart specifies the rated (maximum) capacity of the machine for every possible configuration and situation. Specifying the operational limits and necessary conditions for safe operation.

Question 2

Name five factors affecting load chart conditions

Answer 2

1. Boom length
2. Operating radius
3. Boom angle
4. Crane configuration
5. Load weight

Question 3

OH&S requires that an employer must ensure a mobile crane or boom truck is equipped with proper load charts at all times.
True or false

Answer 3

True …. as an operator always inform employer if charts are missing

Question 4

According to OH&S at what percent of a cranes capacity must the operator ensure and complete a lift calculation for.

Answer 4

75%

Question 5

Define gross capacity

Answer 5

The crane capacities that are found in the load chart. The maximum gross load the crane can lift.

Question 6

Define net capacity

Answer 6

The actual load weight a crane can lift. Net capacity is gross capacity minus deductions.

Question 7

Define net load

Answer 7

The actual weight of the load

Question 8

Define gross load

Answer 8

The load weight plus attachments (I.e. Ball, block, jib, rigging )

Question 9

Define notes in reference to load charts

Answer 9

Additional manufacturer instructions within the load chart

ALWAYS READ BEFORE CALCULATING CHARTS!!

Question 10

Define deductions

Answer 10

Items that represent the amount of weight to be deducted from the gross capacity to determine the net capacity.

Question 11

Define radius

Answer 11

The total distance between centre of gravity of the load and centre of rotation of the crane.

Question 12

Define line pull

Answer 12

Rated pull for winch on single part of line

Question 13

Define parts of line

Answer 13

The amount of times the cable is reeved or laced between the boom tip and load handling block.

To determine the number of parts required simply divide the gross load by allowable line pull.

Question 14

Define percent of capacity

Answer 14

The amount of the cranes capacity that is being utilized in a specific lift.

Gross load divided by gross capacity multiplied by 100

Question 15

The rated capacities of mobile cranes are based on both strength and stability. What is the difference between them ?

Answer 15

Structural
-based on mechanical(structural)limitations
Stability
- based on percentage of tipping load

Question 16

It is important to know the limitations of quadrants and which ones you will be using. Name them

Answer 16

1. Over front
2. Over read
3. Over sides
4. 360degrees

Question 17

Define boom length

Answer 17

The distance from the boom base pivot to the centre of boom tip sheaves.

Question 18

What is “boom angle”?

Answer 18

The angle between the boom and the horizontal plane (ground)

Question 19

What is the boom point elevation ?

Answer 19

The vertical distance between the bottom of the boom sheaves and the ground.

Question 20

What is “area of operation”?

Answer 20

Area measured in circular arc from the centre of rotation of the specific crane

Question 21

Name some load attachments

Answer 21

Ball, block, jib, rigging

Question 22

Unless otherwise indicated in the load charts, If the actual values of boom length, boom angle, and load radius do not correspond with of the listed chart values you have to compare gross capacities for what ?

Answer 22

Next longer boom length*
Next lower boom angle
Next further radius

caution the gross capacity rating for the next longest boom may actually be higher (in some cranes ) than it is for the shorter boom.

Question 23

What does a part of line refer too ?

Answer 23

The amount of times the load line has been laced or reeved between the boom tip and load handling block.

Question 24

What is the equation for parts of line required in a lift.

Answer 24

POL=loadweight/line pull

Divide the gross load by the single working load of the hoist rope

Question 25

How would you calculate weight of hoist rope?

Answer 25

Weight = number of parts of line x length of hoist line x pounds per foot of each part of line

Question 26

What is a range diagram ?

Answer 26

A side view of the crane with its full range of boom lengths, jibs and boom extensions.

Question 27

What is a range diagram very useful for?

Answer 27

Pre job planning

Question 28

When should you read the load chart notes and what do they contain?

Answer 28

Always read first before calculating load chart information.
Contain additional manufactures instructions within the load chart and important information specific to each individual crane

Question 29

What is an operational aid and when is one required ?

Answer 29

An operational aid is a load indicator, rated capacity indicator or a LMI (load moment indicator)

Question 30

What is two blocking ?

Answer 30

Two block occurs when the hook block is pulled up into the boom tip sheaves. The wire rope can be cut, damaged or overloaded

Question 31

Can you run a crane without a anti two block device ?

Answer 31

Yes but ANSI requires someone to watch the boom tip to prevent two blocking

Question 32

When should you lift “on rubber”?

Answer 32

Only when completely necessary

Question 33

There are six main precautions to be considered when performing a pick and carry. List them

Answer 33

1. Boom to be as short as possible
2. Boom to be as low as possible with the load close to the carrier
3. Load should be close to the ground
4. Load should be tied back to the carrier if possible
5. Route should be smooth and level
6. Swing break must be set