Mobile Crane Operation: Safety and Operational Procedures | Exercises Advanced Education

Mobile Cranes No. 1

The load radius as shown on the capacity chart is the distance from the center of rotation to the

centerline of the vertical host line with: - The rated load suspended.

If the jib angle to ground is changed from 50 degrees to 40 degrees, this would affect the capacity of

the crane how? - Capacity will decrease.

Load capacity charts are based on 75% of tipping for crawler cranes without out riggers. For wheel

mounted cranes, using outriggers fully extended, capacities are based on what percentage of

tipping? - 85%

The operators should exercise extreme caution when lifting loads from the water mainly because: -

The load on the crane will increase as an object leaves the water.

On the upper works - On the carrier.

When working on soft soil with poor bearing support: - Use matting to distribute crane's weight over a

larger area.

The best way to determine the weight of a load to be lifted is to: - Have a certified load weight and

add in the weight of all rigging.

When a situation arises that will not permit outriggers to be set at positions that correspond to the

locations established by the manufacturer's load rating charts, the crane manufacturer shall be

consulted to determine if any capacity reductions, special operation procedures, or limitations are

required. If required information is not available from the manufacturer, whom shall be consulted? -

Qualified person.

When performing a pick and carry operation using a crawler crane, the load should be positioned: -

Over the front.

A thick dark line running across the load chart means that the load listings: - Above the lines are

limited by structural factors.

Dynamic motion such as swinging with a load can cause what change in the crane operation? -

Increased load radius.

The dead end of the wire rope above the wedge socket must extend a minimum of 6 times the rope

diameter or: - 6 inches.

A work area chart is used to: - Identify capacity changes due to operational quadrants.

Which of the following 3 sling hitches is listed in order from the strongest to the weakest? - Basket,

Vertical, Chocker.

An anti-2-block damage of prevention system will: - Prevent any crane movements that will cause a

2-block condition.

The minimum distance for safety between the swing radius of the counter weight and any obstacle is:

- 2 Feet.

What is the best source of information for determining boom tip height? - Working range diagram

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Mobile Cranes No. 1

The load radius as shown on the capacity chart is the distance from the center of rotation to the centerline of the vertical host line with: - The rated load suspended. If the jib angle to ground is changed from 50 degrees to 40 degrees, this would affect the capacity of the crane how? - Capacity will decrease. Load capacity charts are based on 75% of tipping for crawler cranes without out riggers. For wheel mounted cranes, using outriggers fully extended, capacities are based on what percentage of tipping? - 85% The operators should exercise extreme caution when lifting loads from the water mainly because: - The load on the crane will increase as an object leaves the water. On the upper works - On the carrier. When working on soft soil with poor bearing support: - Use matting to distribute crane's weight over a larger area. The best way to determine the weight of a load to be lifted is to: - Have a certified load weight and add in the weight of all rigging. When a situation arises that will not permit outriggers to be set at positions that correspond to the locations established by the manufacturer's load rating charts, the crane manufacturer shall be consulted to determine if any capacity reductions, special operation procedures, or limitations are required. If required information is not available from the manufacturer, whom shall be consulted? - Qualified person. When performing a pick and carry operation using a crawler crane, the load should be positioned: - Over the front. A thick dark line running across the load chart means that the load listings: - Above the lines are limited by structural factors. Dynamic motion such as swinging with a load can cause what change in the crane operation? - Increased load radius. The dead end of the wire rope above the wedge socket must extend a minimum of 6 times the rope diameter or: - 6 inches. A work area chart is used to: - Identify capacity changes due to operational quadrants. Which of the following 3 sling hitches is listed in order from the strongest to the weakest? - Basket, Vertical, Chocker. An anti-2-block damage of prevention system will: - Prevent any crane movements that will cause a 2-block condition. The minimum distance for safety between the swing radius of the counter weight and any obstacle is:

2 Feet. What is the best source of information for determining boom tip height? - Working range diagram

Attachments or extra counter weights not approved by the manufacturer should not be attached to the rear of the crane because: - They may cause a backward stability problem. The first thing an operator should do before traveling under a low pipe rack is: - Post a signal person to check clearance. The only time the outrigger beams should be less than fully extended is when: - The load chart indicates that this is allowed. The boom angle indicator shows boom angle and reference to the capacity chart: - Is used along with boom length to determine radius. On telescopic crane, when is the boom a deduction? - Not a deduction The crane operator should check the load hoist breaks by: - Raising the load a few inches and holding it. In running ropes, other than rotation resistance rope, what is the number of randomly distributed broken wires in a rope lay and it must be replaced? - 6 broken wires In a 2 crane lift operation; what are often the results of 1 crane landing its share of the load before the other crane does? - The load is increased at the suspended end. The backward stability of a crane is tested with a basic boom in: - Maximum angle with no load. When rotation of the load may be hazardous, the operator should: - Verify that a tag line is used. Which of the following could be most dangerous, when working a crane near a newly constructed building? - Non-compacted soil covering underground utilities. An auxiliary boom head is intended to be used with: - A whip line. If the crane's power fails during operation, the operator should: - Set all breaks and locking devices. Wire rope lubricant should not: - Hinder a visual inspection. What is one of the most common affects of boom side loading? - Structural failure. As per ANSI B 30.5, how may full wraps of rope are required on the hoist drum, when the hook is in extreme low position? - 2 full wraps. Construction site hazards and restrictions, such as electric power and piping, are located and identified by: - Pre-operational work site inspection. If a machine is not level and swings a load from the high side to the low side, the load radius will: - Increase. Which of the following will not cause a 2 blocking condition on hoist lines? - Raising the boom. An example of duty cycle crane operations would be: - The handling of personnel baskets. Unless otherwise indicated, on the load capacity chart, if the actual boom length on the telescopic boom crane is between the lengths listed on the chart, the operator should: - Use the next longer boom length in the chart.

Which of the following sources can be used to find out the maximum width of a crane with the outriggers/stabilizers fully extended? - the crane manufacturers manual Of the following, which allows a part of the boom or a load to operate closer to power lines than the minimum clearance? - Insulating links. Which of the following is the most important fact to consider about site access? - compaction A crane's net capacity should be the same as the: - manufacturers load ratings minus all deductions A load chart does not list the weight limit for each part of the line; if the line pull is 8000 pounds how many parts would be necessary to lift 38,320 pounds - 5 To make sure that a load chart is the correct one for the crane being operated, the most important thing to check is whether the chart: - Shows the same serial number as the crane. As rope spools on to the hoist drums of a crane, available line pull - decreases Any power line is considered energized unless the - electrical utility authorities verify that it is not energized. When working on tires on a rough terrain, backward tipping is most likely to occur when working over the - side at a short radius. During a shift inspection what is not required to be inspected? - Structural members A suspended personnel platform should not be used when the wind reaches - 20 mph What would you consider the load block or ball, rigging and load to be? - Gross load According to federal regulations, the minimum distance between any part of the crane or load, and a power line rated 50kv is - 10 feet Which of the following should be done before an actual operation begins? - Have a pre-lift meeting A critical item to control for a two-crane lift is the - maintain vertical hoist lines. Hoist ropes (other than rotation resistance ropes) must have a minimum design factor of: - 3. The superstructure of a crane is the - entire upper works above the swing circle. How does an operator determine the recommended rope for the crane? - By reading the manufactures load chart or operators manual. If an operator cannot clearly read the cranes load chart due to a quality of print, it is necessary to - obtain a new chart by model and serial number. Unless otherwise stated, the standard rope used on most cranes is: - right regular lay How large of an area should be barricaded off when setting up a crane in a location to which the public has access?> - The working radius of the crane When lifting personnel with a mobile crane under planned conditions of use, the load ratings chart capacity must be reduced by at least - 50 percent What taglines should not be used near power lines? - Small diameter wire rope.

Starting and stopping the swing of a crane too quickly will cause? - side loading of the boom Before leaving a crane unattended, the operator should - land any load or lifting device. The proper procedure for calibrating the boom angle indicator is to - raise the boom to horizontal (using a level on the boom) and set the indicator to zero The prime function of boom extensions or jibs are: - increase lift height According to OSHA, during assembly who must address hazards associated with the operation - A/D Supervisor All hazards and problems that are found on the worksite should be identified: - at the preoperational worksite inspection A crane 3 degrees ot of level can decrease capacity as much as - 50% The best way to detect the presence of underground natural gas pipes is to - check with local utility companies. When performing basic load rating procedures from a two-point hookup, measuring the angle from horizontal, it is very important to remember that the - lower the sling angle the greater tension According to the B30.5 a signal person is required to observe power lines when the crane is within - a boom's length of the limit of approach. The most effective method for preventing people from being crushed between an obstruction and the counterweight is to: - barricade or fence off the swing area. In general, radius, as defined in the load charts of cranes, refers to the distance from the center of gravity of a freely suspended load to the - center of rotation The main reason outrigger's should be set properly before assembling the boom is to - Provide enough stability to raise the boom if a crane comes in contact with power lines, it is critical that everyone be kept away from the crane, the load line, and the load because - all three can become energized including the ground around the crane. When should an operator use "signs of tipping" to determine capacity limits. - never Unbalanced reeving of boom tip sheaves may cause - torsion (twisting) of the boom According to B30.5 determing the correct weight of the load to be lifted by a crane is the responsibiltiy of - the site supervisor, When a jib is installed on a boom tip but is not used, what weight must be deducted from the crane's gross capacity to detmine the net capacity? - Effective weight of the jib When using 6x19 regular preformed wire3 rope for personnel lifting the cranes load line must be capable of supporting at least how many time the maximum intended load. - 7 Changing 1 part of line to 2 parts of line will affect hoisting speed how? - Decrease by 50%

Mobile Crane Operation: Safety and Operational Procedures, Exercises of Advanced Education

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Mobile Cranes No. 1