mobile cranes Flashcards
determine if this statement is true or false. all lifts reqire some type of lift plan.
- true
- false
page 2
- true
page 2
determine if this statement is true or false. all lift plans require an engineering staff and site drawing.
- ture
- false
- false
page 2
which of the following would be included in a detailed lift plan:
1. size, shape, weight of the load
2. size, type, set-up of crane
3. ste-by-step movements of cranes
4. all of the above
4. all of the above
(1. size, shape, weight of the load
2. size, type, set-up of crane
3. ste-by-step movements of cranes)
page 2
Determine If this statement is true or false. A documented pre-lift plan will state the names of the engineers and supervisors who have worked to prepare the plan.
- true
- false
- true
page 2
Determine if this statement is true or false. A documented pre-lift plan will state the names of the operator(s) and the riggers who will rig the load and perform the lift.
- true
- false
- true
page 2
Determine if this statement Is true or false. As crane signaling is only a basic function and the signal-person knows where the loads will be positioned, training or
testing of the signal-person should not be required.
- true
- false
- false
page 3
When using hand signals to direct a crane operator, an extended arm with the thumb vertical and the fingers opening and closing into a fist indicates:
1. lower load
2. raise boom and lower load
3. raise the load line
4. extend boom
- raise boom and lower load
page 4
Two closed fists with both thumbs pointing toward each other is the signal for:
1. retract hydraulic boom
2. lower jib
3. lower load slowly
4. secure load in position
- retract hydraulic boom
page 4
Determine if this statement is true or false. A crane component made by a crane company can be used on any other crane made by that company.
1. true
2. false
- false
page 6
Which type of crane would be best to use where a tight turning radius is required?
1. all-terrain
2. crawler crane
3. carrier-mounted
4. ringer crane
- crawler crane
page 9
To prevent damage, what type of sling should be used to lift a lattice boom?
1. wire rope slings
2. chain slings
3. metal mesh slings
4. synthetic web slings
- synthetic web slings
page 17
When Is the proper time to attach the counterweight to the crane?
1. before load Is lifted
2. prior to Installation of the complete boom
3. after installation of boom
4. only if load weight exceeds crane weight
- prior to Installation of the complete boom
page 18
In order for a crane to lift its own counterweight for loading or off-loading, which of the following criteria should be met to ensure maximum safety?
1. must be on firm level ground
2. gantry must be fully extended
3. four part load line must be used
4. all of the above
- all of the above
page 18
When assembling lattice boom sections, which set of pins are installed first?
1. left side
2. right side
3. both lower
4. both upper
- both upper
page 20
When installing the boom pins, the pin should be pointing:
- out away from boom center
- in toward boom center
- out away from boom center
page 22
When dismantllng a lattice boom, which boom pins should be removed first?
- □ left side
- right side
- both lower
- both upper
- both lower
page 23
Determine If this statement is true or false. It is safe to climb under a boom to knock out the boom pins if the crane has tension on the pendant lines.
- true
- false
- false
page 24
Which position should the gantry of a crane be In when lifting a load?
1. highest position
2. third position
3. mid position
4. lowest position
- highest position
page 25
Jib forestay and backstay pendant lines should be:
1. of equal length, or the forestay pendant lines should be longer
2. of equal length, or the backstay pendant lines should be longer
- of equal length, or the backstay pendant lines should be longer
page 27
Determine If this statement is true or false. Jib capacity “increases” as the angle to the ground decreases.
1. true
2. false
- false
page 28
To avoid torsional loading, the boom tip sheaves should be reeved:
1. non-symmetrical
2. symmetrlcal
3. with an even number of line parts
4. with an uneven number of line parts
- symmetrlcal
page 29, 30
Which of these conditions could be dangerous when operating a crane around a newly constructed building?
1. height of structure
2. uncompacted soil
3. protected pedways
4. compacted soil
- uncompacted soil
page 33
Whenhoistingonoutriggerswithapermitted360degree swing, which position is the most hazardous in most conditions?
1. over front
2. over rear
3. over side
4. over corner
- over corner
page 35,36
Determine if this statement is true or false. The ground pressure under outriggers is higher than it Is under a crawler track because of a smaller bearing surface.
1. true
2. false
- true
page 36,37
Outrigger blocking should be approximately how much larger than the outrigger floats?
1. same
2. 1.5 times
3. 2 times
4. 3 times
- 3 times
page 37
Determine if this statement Is true or false. When determining whether a crane Is level, percentage of grade and degree measurement Is the same.
1. true
2. false
- false
page 38
On a 48 inch crane rotation ring, a crane 1% off-level would be how much in inches?
1. almost 5 inches
2. almost one-half inch
3. almost one-eighth inch
4. too small to measure
- almost one-half inch
page 38
Determine if this statement is true or false. A crane sitting 3 degrees off-level with a long boom at minimum radius, can have an increase in boom stress of approximately 50%.
1. true
2. false
- true
page 39
The load line is hanging in the dead center of the boom when positioned over the rear. With the boom over the side, the load line is observed to be off center. This means it is:
1. safe to lift over the rear
2. safe to lift over the corner
3. safe to lift over the side
4. not safe to lift untll level in all positions
- not safe to lift untll level in all positions
page 40
Determine if this statement is true or false. Unless a crane has been so designed with a pinned intermediate location and a matching chart rating, a crane should be operated with all outriggers retracted or fully extended and set.
1. true
2. false
- true
page 41
Determine if this statement is true or false. Computerized Load Moment Indicators warn the operator of an overload condition.
1. true
2. false
- true
page 41,42
Determine if this statement is true or false. Use of computerized Load Moment Indicators Is a quick, easy method of checking a load weight that Is approved by crane manufacturers and safety regulations.
1. true
2. false
- false
page 42
Crane stability is based on:
1. lever prlnciple
2. ability of crane hoist to lift load
3. load measurements
4. height of lift
- lever prlnciple
page 44
The crane center of gravity will vary the most while swinging from rear to side to front with which type of machine?
1. crawler cranes
2. truck cranes
3. cherry pickers
4. same with all types
- truck cranes
page 46
Determine if this statement is true or false.The approved swing working areas of a crane are referred to as quadrants of operation.
1. true
2. false
- true
page 47-49
The effective weight of a jib is:
1. higher than the actual weight
2. lower than the actual weight
3. same as actual weight
4. depends on crane, could be any of the above
- depends on crane, could be any of the above
page 50
When using the main load line with the jib attached, the working load for the boom must be reduced by:
1. weight of jib attachments
2. weight of jib pendants
3. weight of jib
4. manufacturer’s specifications for Jib and hook weight reduction
- manufacturer’s specifications for Jib and hook weight reduction
page 51, 52
Determine if this statement is true or false. A common practice and safe method of determining when a crane is overloaded is to watch for and back off at the first indication of tipping.
1. true
2. false
- false
page 53, 54
Determine if this statement is true or false. A crane that “goes light” is not yet overloaded, and can be safely returned to normal by rapid load lowering.
1. true
2. false
- false
page 53,54
Boom angle is the measured angle between what and the centerline of the boom.
1. vertical
2. horizontal
- horizontal
page 55
On load charts with the upper and lower numbers divided, the upper numbers are in the range that mean the crane will do what if it Is overloaded?
1. tip
2. structurally fail
3. cannot lift the load
4. none of above
- structurally fail
page 56
Determine if this statement is true or false. When using crane load charts, It is not permitted to guess or calculate In between values.
1. true
2. false
- true
page 57,58
If the measured radius between crane rotation point and load center is 57 feet, and the load chart only shows values at 55 feet and 60 feet, which value would be used?
1. 55 feet
2. 60 feet
3. must consider boom length
4. depends on load weight
- 60 feet
page 58
Using the range diagram on page 61determine the approximate load radius with a boom length of 84 feet at an angle of 30 degrees.
1. 80 feet
2. 70 feet
3. 67 feet
4. 55 feet
- 70 feet
page 61
Determine if this statement is true or false. The crane is always setup to specification, therefore the load chart does not have to be used to determine the required number of parts of line in the main load block to lift a load.
1. true
2. false
- false
page 62
Determine if this statement is true or false. In general terms, everything below the boom tip, or jib tip is considered load.
1. true
2. false
- true
page 63,64
Using load calculation example one, on pages 65, 66, but with a load weight of 53, 400 pounds, what would be the maximum operating radius allowed with the crawlers extended?
1. 50 feet
2. 55 feet
3. 60 feet
4. 65 feet
- 55 feet
page 65,66
Determine if this statement is true or false. Even with high voltage power lines, it is not possible to have an electrical accident unless the crane or load actually hits the line.
1. true
2. false
- false
page 69
Determine if this statement is true or false. A signal-person must be used if a crane can swing within the limit of approach of a power transmission line.
1. true
2. false
- true
page 71
Determine if this statement is true or false. The operator should always jump out of the cab as quickly as possible if the crane makes contact with a power line.
1. true
2. false
- false
page 72
