Mobile Cranes Exam Questions and Complete Solutions Graded A+

Mobile Cranes Exam Questions and Complete Solutions Graded A+ Ture 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 signalperson should not be required. - Answer: False When using hand signals to direct a crane operator, an extended arm with the with the thumb vertical and the fingers opening and closing into a fist indicates: - Answer: raise boom and lower load. Two closed fists with both thumbs pointing toward each other is a signal for : - Answer: Retract hydraulic boom Which of the is not a permitted use of an "operational aid"? warn of approaching two-block condition indicates changing boom angle warns of approaching crane overload used to test weigh a load prior to hoisting - Answer: used to test weigh a load prior to hoisting T.F. Any crane component can be used on any other crane made by the same company. - Answer: False A rough terrain crane is commonly referred to as: 1. mobile crane 2. crawler crane 3. carrier crane 4. cherry picker - Answer: cherry picker 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 - Answer: uncompacted soil When hoisting on outriggers with a permitted 360 degree swing, which position is the most hazardous in most conditions? 1. over front 2. over rear 3. over side 4. over corner - Answer: 4. over corner T.F. The ground pressure under outriggers is higher than it is under a crawler track because of the smaller bearing surface. - Answer: True An outfigger float should be approximately how much larger than the outrigger pad? 1. same 2. 1.5 times 3. 2 time 4. 3 times - Answer: 4. 3 times When setting up a crawler crane for use on a new site, which of the following is not required prior to use? 1. operator manual and service manual 2. inspected components 3. crane logbook 4. name of the person who will operate the crane - Answer: 4. name of the person who will operate the crane. Where should the slings be attached when lifting lattice boom sections? 1. use the end connections 2. choke at the mid-point of the main chords 3. to the chord lacings 4. depends on the boom length - Answer: 1. use the end connections T.F. During crane assembly, the counterweight is mounted after the installation of the complete boom. - Answer: False When assembling lattice boom sections, which set of pins are installed first? 1. left side 2. right side 3. both lower 4. both upper - Answer: 4. both upper 15. When installing the boom pins, the pins should be pointing. 1. out away from the boom center 2. in toward the boom center - Answer: 1. out away from the boom center When dismantling a lattice boom, which boom pins should be removed first? 1. left side 2. right side 3. both lower 4. both upper - Answer: 3. both lower 17. T.F. It is safe to climb under a boom to knock out the boom pins if the crane has tension on the pendant lines. - Answer: False What important step must be followed when welding a damaged crane boom? 1. follow manufacturers welding procedure 2. have a welder certified to the correct welding procedure. 3. user correct welding rods and heat treatment. 4. All of the above - Answer: 4. All of the above. What 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 - Answer: 1, highest position 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. - Answer: 2. of equal length, or the backstay pendant lines should be longer T.F. Jib capacity "increases" as the angle to the ground decreases. - Answer: False T.F. On most cranes the jib hoist and boom hoist can be safely operated simultaneously. - Answer: False Which of the following is an auxiliary boom, or an extension of the mane boom? 1. gantry 2. mast 3. jib 4. all of the above - Answer: 3. jib All wire rope on a crane (hoist lines, boom hoist lines, pendant lines, etc.) have a standardized design (safety ) factor of : 1. 2.5 to 1 2. 3 to 1 3. 3.5 to 1 4. will vary depending on the crane and the applicaiton - Answer: 4. will vary depending on the crane and the application To avoid torsional loading, the boom tip sheaves should be reeved: 1. non-symmetrical 2. symmetrical 3. with an even number of line parts 4. with an uneven number of line parts. - Answer: 2. symmetrical T.F. Hoisting with a crane is performed only on rubber or with outriggers fully extended unless it is designed for an intermediate outrigger position and has a matching chart. - Answer: True T.F. When determining whether a crane is level, percentage of grade and degree measurement is the same. - Answer: False How much out of level, in inches, is a crane with a 48 inch rotation ring that is 1% off level? 1. almost five inches 2. almost 1/2 inch. 3. almost 1/8 inch 4. too small to measure - Answer: 2. almost 1/2 inch T.F. A crane sitting three degrees off-level with a long boom at minimum radius, can have an increase of boom stress of approximately 50% - Answer: True The load line is hanging plumb when positioned over the rear When positioned 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 until level in all positions - Answer: 4. not safe to lift until level in all positions. Crane stability is based on : 1. lever principle 2. ability of crane hoist to lift the load. 3. load measurements 4. height of lift - Answer: 1. lever principle 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 - Answer: 2. truck cranes T.F. Computerized load movement indicators warn the operator of an overload condition. - Answer: True T.F. Use of computerized load moment indicators is a quick, easy method of checking load weight that is approved by crane manufacturers and safety regulations. - Answer: True What determines crane capacity. 1. machine weight 2. stability 3. strength of components 4. all of above - Answer: 4. all of above Determine if this statement is true or false. Load dimensions could have as much bearing on boom radius as the load weight. - Answer: True Deflection of the boom and pendant stretch will increase: 1. load radius 2. weight of the boom 3. load weight 4. crane stability - Answer: 1. load radius T.F. A crane that has been overloaded, resulting in structural failure, will always have the breakage show immediately. - Answer: F When raising a long boom up off the ground, what will avoid excessive pendant pull and boom compression 1. keep main block on ground while raising the boom 2. use a second crane to raise the boom. 3. all the above. - Answer: 3. all the above. T.F. The approved swing working areas of a crane are referred to as quadrants of operation. - Answer: True The effective weight of a jib is: 1. higher than the actual weight 2. lower than the actual weight 3. same as the actual weight 4. depends on crane, could be any of the above. - Answer: 4. depends on crane, could be any of the above. 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 - Answer: manufacturer's specifications for jib and hook weight reduction What are the safe load weight numbers given in a crane load chart" 1. net capacity 2. net load minus rigging 3. gross load minus rigging 4. gross load - Answer: 4. gross load When hoisting, a sudden start or stop produces a: 1. static load 2. dynamic load - Answer: 2. dynamic load Specific details on calculating the weight of crane components to set up for a safe lift are found in: 1. operators manual 2. rigging handbook 3. load chart data 4. all of above - Answer: 3. load chart data T.F. A method of determining when a crane is nearing overload is to watch for the outriggers to slightly lift off the floats (the first sign of tipping). - Answer: F T.F. A crane that "goes light" is not yet overloaded and can be safely returned to normal by rapid load lowering - Answer: False T.F. The quadrant of operation is shown on most mobile crane load charts. - Answer: True 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 the above - Answer: 2. structurally fail T.F. When using crane load charts, it is not permitted to guess or calculate in-between values. - Answer: True Boom angle is the measured angle between _____ and the centerline of the boom. 1. vertical 2. horizontal - Answer: 2. horizontal 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 - Answer: 2. 60 feet Using the range diagram on page 313, determine the approximate load radius under the jib tip (at the offset shown) and maximum boom extension of a 60 degree angle. 1. 44 feet 2. 60 feet 3. 77 feet 4. 85 feet - Answer: 3. 77 feet From the previous question, what chart radius value would be used to calculate capacity. 1. 45 feet 2. 60 feet 3. 80 feet 4. 85 feet - Answer: 3. 80 feet T.F. The crane is always set up 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. - Answer: False T.F. In general terms, everything below the boom tip is considered load. - Answer: True What load chart weight term defines the main block, rigging hardware, the actual load, and any attached jib and jib hook? 1. gross load 2. net load - Answer: 1. gross load Using load calculation example one, on pages 309 and 310, and a load weight of 53,400 pounds, what is the maximum radius allowed with the crawlers extended? 1. 50 feet 2. 55 feet 3. 60 feet 4. 65 feet - Answer: 2. 55 feet T.F. The weight of a load being lifted by two cranes in tandem is only 50% of the lifting capacity of either crane. Therefore it is not a critical lift and does not require a lift plan. - Answer: False T.F. For tandem crane lifts, the shared load reduces the need for the cranes to be exactly level. - Answer: False Page 322 illustrates a method of determining load share on a two-crane lift. Use the formula, crane capacities, dimensions from the example shown, but use a 100,000 pound load. The load on crane A and crane B would be: - Answer: Crane A: 57,711 lbs Crane B: 42,288 lbs Pagews 325 and 326 illustrate a method of determining load share on a two-crane lift using an equalizer beam. Use the formula on page 326, crane capacities, and dimensions from the example shown, but use a 130,000 pound load including lifting beam and rigging. The load on crane A and crane B will be: - Answer: Crane A: = 78,591 lbs Crange B: = 51,409 lbs From question 63, determine if this is a fafe lift for both cranes if crane A has a capacity of 96,400 lbs. and crane B a capacity of 62,900 lbs. - Answer: Crane A: no Crane B: no Which of these conditions will dramatically affect the values illustrated on the load charts? 1. improper outrigger set up 2. changing radius 3. wind 4. all of the above - Answer: 4. All of the above. T.F. After a load is off the ground and the boom starts to swing, the actual swing rate of speed will never have any bearing on the conditions affecting the crane. - Answer: False Which of these weather conditions is more likely to restrict of completely stop hoisting activities. 1. wind gusts. 2. light breeze 3. light rain 4. light snow - Answer: 1. wind gusts. When a crane is traveling with a load, whenever possible the load should be: 1. low to ground and far out 2. as high as possible without hitting boom. 3. always carried over the rear 4. tied off, low to the ground, and close to carrier. - Answer: 4. tied off, low to the ground, and close to carrier. When a hydraulic boom is not extended with equal section lengths, the effect is: 1. damage the hydraulic system 2. overload the longest section. 3. equal extension does not matter - Answer: 2. overload the longest section T.F. It is permissible to let the boom of the crane rest on the edge of a building while lowering a load onto the roof. - Answer: False T.F. As long as another person is on watch, it is permissible to hoist personnel in a basket when the anti two-block device is not working. - Answer: False T.F. Even with the high voltage power lines, it is not possible to have an electrical accident unless the crane or load actually hits the line. - Answer: False T.F. A signalperson must be used if a crane can swing within the limit of approach of a power transmission line. - Answer: True T.F. The operator should always jump out of the cab as quickly as possible if the crane makes contact with a power line. - Answer: False T.F. It is not necessary for an equipment operator to check the recent log book entries before commencing operation as that is the responsibility of the supervisor. - Answer: False Who is responsible to sign and date the crane log book when it is inspected. 1. operator 2. signalperson 3. mechanic 4. inspector - Answer: 4. inspector T.F. It is safe to reach through the openings of a hydraulic boom if the machine is not running - Answer: False T.F. It is always safe to remove the hydraulic reservoir filler cap to check the level immediately after the machine is stopped. - Answer: False T.F. The crane operating control positions are not regulated and every crane manufacturer locates the controls in relation to each other differently. - Answer: False If the boom swing lever is pushed forward, the boom will: 1. swing left 2. swing right 3. could be either, depending on boom and control position. - Answer: 3. could be either depending on boom and control position. Which of these items "would not" be necessary to check before starting the engine of a crane. 1. transmission was in neutral 2. oil pressure gauge 3. parking brake was applied. 4. swing lock is engaged. - Answer: 2. oil pressure gauge Determine if this statement is true or false. Depending on the model, boom swing is stopped with the swing control lever, or a foot pedal - Answer: True T.F. When extending a hydraulic boom, the load line will automatically lower to prevent the block from hitting the boom tip. - Answer: False T.F. With a suspended load, the operator can leave the seat if the machine is in perfect condition and all brakes are set. - Answer: False T.F. The operator must take signals from one person only, but must obey a stop signal from anyone. - Answer: True T.F. After being programmed, an operational aid must ONLY be checked for accuracy by the manufacturer ever six months. - Answer: False T.F. If the readout on an operational aid does not match the crane load chart ratings, the operational aid numbers will take precedence. - Answer: False