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NM Crane Operator practice questions

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Question 1Crane Types, Components, and Terminology

On a lattice boom crane, what is the primary function of the boom foot pins?

  1. They adjust the boom angle during operation
  2. They anchor the pendant lines to the boom tip
  3. They secure the boom butt to the boom pivot section and transmit load into the revolving frame Correct answer.
  4. They connect boom sections to the jib

Explanation

Boom foot pins join the boom butt to the boom pivot (foot) section, transferring the boom's compressive and moment loads into the revolving bed and turntable structure. They are a structural connection, not an adjustment or rigging component.

Question 2Crane Types, Components, and Terminology

A crane is described as having a 'hammerhead' configuration. Which feature defines this type?

  1. A lattice boom supported by a single lattice mast
  2. A telescopic boom mounted on a rough-terrain carrier
  3. A boom that pivots on a turntable mounted on crawler tracks
  4. A horizontal jib balanced by a counterweighted tail on a vertical tower Correct answer.

Explanation

A hammerhead (flat-top) tower crane has a horizontal load jib and a shorter counter-jib carrying counterweight, both mounted atop a vertical tower without a cathead and pendant lines. The horizontal jib acting as a balanced beam is the defining characteristic.

Question 3Crane Types, Components, and Terminology

What does the term 'SWL' indicate on a crane's load chart and rigging hardware?

  1. The counterweight required to offset the load
  2. The total weight of the crane's upper works
  3. The maximum load the component is rated to lift under stated conditions Correct answer.
  4. The weight of the boom plus the hook block

Explanation

Safe Working Load (SWL) is the maximum load a crane configuration or rigging component is rated to handle under the specified conditions, including radius and reeving. It is a rated capacity, not a physical weight of crane parts.

Question 4Crane Types, Components, and Terminology

On a crawler crane, what is the purpose of the crawler frames and track shoes?

  1. They counterbalance the boom during lifting
  2. They provide a stable base and distribute machine and load weight over a large ground area Correct answer.
  3. They act as outriggers to level the machine
  4. They allow the crane to travel at highway speeds between sites

Explanation

Crawler frames and track shoes spread the crane's weight, including lifted loads, over a large ground-contact area to reduce ground bearing pressure and provide a stable working base. They are not designed for high-speed road travel or as leveling outriggers.

Question 5Crane Types, Components, and Terminology

What is the function of the boom hoist (luffing) system on a lattice boom crane?

  1. To travel the crane
  2. To raise and lower the hook block
  3. To raise and lower the boom by paying wire through the boom pendant and mast Correct answer.
  4. To swing the upper works

Explanation

The boom hoist, or luffing system, uses wire rope reeved through the boom point pendants and the mast or gantry to change the boom angle. It controls boom elevation, not hook movement or swing.

Question 6Crane Types, Components, and Terminology

In crane terminology, what is 'reeving'?

  1. The pattern in which wire rope is threaded through sheaves and drums Correct answer.
  2. The process of leveling the crane on outriggers
  3. The angle between the boom and the horizontal
  4. The method of stowing the boom for travel

Explanation

Reeving is the arrangement and threading of wire rope through sheaves, blocks, and drums to create the desired parts of line. The number of parts of line affects capacity and line pull.

Question 7Crane Types, Components, and Terminology

Which component on a telescopic boom crane allows the boom sections to extend while carrying load?

  1. The swing bearing
  2. The counterweight
  3. The extend/retract cylinder or telescoping system Correct answer.
  4. The outrigger beam

Explanation

The telescoping system, driven by extend/retract cylinders or cables, slides the inner boom sections outward to increase boom length. The swing bearing, counterweight, and outriggers serve other functions.

Question 8Crane Types, Components, and Terminology

A crane's load chart lists a capacity at a 40-foot radius with a given boom length. What does 'radius' refer to?

  1. The horizontal distance from the center of rotation to the center of the load Correct answer.
  2. The distance between the crane's outriggers
  3. The length of the boom from foot pin to tip
  4. The height of the boom tip above ground

Explanation

Radius is the horizontal distance from the crane's center of rotation to the center of gravity of the load, measured with the boom at operating position. It is a key load-chart variable because capacity drops as radius increases.

Question 9Crane Types, Components, and Terminology

What distinguishes a tower crane's 'counter-jib' from its 'load jib'?

  1. The counter-jib is the vertical tower while the load jib is the horizontal arm
  2. The counter-jib carries counterweight and hoist machinery, while the load jib carries the trolley and lifted load Correct answer.
  3. Both carry counterweight but differ only in length
  4. The counter-jib carries the load while the load jib carries counterweight

Explanation

On a tower crane, the load jib extends outward to carry the trolley and load, while the counter-jib extends opposite to carry counterweight and often the hoist machinery. This arrangement balances the overturning moment on the tower.

Question 10Crane Types, Components, and Terminology

A crane's load chart shows a lower capacity when the boom is at a long length at the same radius. Why?

  1. Longer booms require more counterweight
  2. Longer booms weigh more, reducing the net capacity available for the load Correct answer.
  3. Longer booms reduce the radius automatically
  4. Longer booms always swing faster

Explanation

A longer boom adds weight and shifts the boom's center of gravity outward, increasing the overturning moment and reducing net capacity at a given radius. The chart accounts for this by derating capacity for longer boom lengths.

Question 11Crane Types, Components, and Terminology

On a lattice boom crane, what is the purpose of the boom point sheaves?

  1. They guide the hoist rope from the boom tip down to the hook block Correct answer.
  2. They attach the boom sections together
  3. They connect the pendant lines to the mast
  4. They support the boom foot pins

Explanation

Boom point sheaves at the tip of the boom redirect the hoist wire rope from the boom to the hook block, establishing the parts of line. They are reeving components, not structural section joints.

Question 12Crane Types, Components, and Terminology

A crane has a 'jib' mounted on the boom tip. What is the typical purpose of this jib?

  1. To increase the crane's counterweight
  2. To level the crane on uneven ground
  3. To provide additional reach or height for lighter loads beyond the main boom's capacity Correct answer.
  4. To replace the main hoist drum

Explanation

A jib attached to the boom tip extends reach or lifting height for lighter loads, and its capacity is usually much lower than the main boom. It is a load-handling extension, not a stability or leveling device.

Question 13Crane Types, Components, and Terminology

What does 'parts of line' mean in crane operation?

  1. The number of rope falls supporting the load between the boom tip and the hook block Correct answer.
  2. The number of pendant lines supporting the boom
  3. The number of boom sections in the telescopic boom
  4. The number of outrigger beams deployed

Explanation

Parts of line is the number of rope falls running between the boom point sheaves and the hook block sheaves that support the load. More parts of line reduce line pull but reduce available line speed.

Question 14Crane Types, Components, and Terminology

Why do rough-terrain crane outriggers need to be fully extended and set on proper mats?

  1. To allow the crane to travel faster
  2. To increase the crane's boom length
  3. To spread the load over adequate ground bearing area and prevent the crane from tipping Correct answer.
  4. To reduce the counterweight needed

Explanation

Fully extended outriggers with proper mats increase the support base and distribute ground pressure, reducing the risk of tipping or ground failure. Load charts are based on specific outrigger configurations being fully deployed.

Question 15Crane Types, Components, and Terminology

What is the 'tip height' of a crane boom?

  1. The height of the counterweight above ground
  2. The horizontal reach of the boom
  3. The length of the boom pendant
  4. The vertical distance from ground level to the boom tip at a given boom angle and length Correct answer.

Explanation

Tip height is the vertical elevation of the boom tip above ground for a specific boom length and angle, used to check whether the lift can clear obstructions. It differs from radius, which is horizontal.

Question 16Crane Types, Components, and Terminology

Which crane type uses a rigid lattice mast with a boom that can be fixed at various angles, often used for long-duration heavy lifts at a fixed location?

  1. Truck crane
  2. Mast crane (stiffleg or guyed) Correct answer.
  3. Aerial work platform
  4. Forklift

Explanation

Mast cranes use a rigid vertical mast with a boom supported by guy wires or stifflegs, suitable for heavy, long-duration lifts at a fixed site. They are not mobile cranes or personnel lifts.

Question 17Crane Types, Components, and Terminology

On a tower crane, what is the function of the slewing ring (slew bearing)?

  1. It anchors the tower to the foundation
  2. It carries the trolley along the jib
  3. It allows the upper works to rotate relative to the tower while carrying vertical and moment loads Correct answer.
  4. It raises and lowers the jib

Explanation

The slewing ring connects the rotating upper works to the fixed tower, permitting rotation while transmitting vertical, horizontal, and overturning moment loads. It is a structural bearing, not a lifting or trolley component.

Question 18Crane Types, Components, and Terminology

A crane's load chart indicates capacities for 'on outriggers' and 'on tires.' Why is the on-tires capacity lower?

  1. The boom is shorter when on tires
  2. Tire and suspension flexibility reduce stability compared to a rigid outrigger base Correct answer.
  3. Tires add lifting force
  4. The counterweight is removed when on tires

Explanation

When operating on tires, the suspension and tire deflection allow the crane to rock, reducing effective stability compared with a rigid outrigger base. Load charts therefore list lower capacities for on-tire operation.

Question 19Crane Types, Components, and Terminology

What is a 'fly jib' on a telescopic boom crane?

  1. A manually or hydraulically attached extension at the boom tip for extra reach at reduced capacity Correct answer.
  2. A boom section that replaces the main boom
  3. A type of outrigger pad
  4. A secondary counterweight section

Explanation

A fly jib is an auxiliary extension mounted at the tip of the main telescopic boom, adding reach or offset for lighter loads. Its capacity is lower than the main boom and is shown separately on the load chart.

Question 20Crane Types, Components, and Terminology

A crane's 'rated capacity' at a given configuration already accounts for which deductions?

  1. The crane's fuel weight
  2. Only the weight of the load
  3. The operator's weight
  4. The weight of the hook block, rigging, and other lifting attachments Correct answer.

Explanation

Rated capacity is the gross load the chart permits, and the net load available equals rated capacity minus the weight of the hook block, rigging, and any lifting attachments. Operators must deduct these to avoid overloading.

Question 21Crane Types, Components, and Terminology

Why must the boom angle be considered together with boom length when determining capacity?

  1. Angle and length together determine radius and the boom's center of gravity, which set the overturning moment Correct answer.
  2. Length alone determines capacity regardless of angle
  3. Angle alone determines capacity regardless of length
  4. Angle affects only swing speed

Explanation

Boom angle and boom length jointly determine the working radius and the position of the boom's center of gravity, both of which drive the overturning moment and thus the capacity. Neither variable alone fixes capacity.

Question 22Crane Types, Components, and Terminology

On a lattice boom crawler crane, what is the role of the gantry or mast in the boom suspension system?

  1. It raises the point where boom pendant lines attach, increasing the mechanical advantage of the boom hoist Correct answer.
  2. It carries the counterweight
  3. It provides the swing motion
  4. It supports the hook block directly

Explanation

The gantry or mast elevates the attachment point of the boom pendants above the boom foot, improving the angle and mechanical advantage of the boom hoist system. It is part of the boom suspension, not the load path or swing drive.

Question 23Crane Types, Components, and Terminology

A luffing-jib tower crane differs from a hammerhead tower crane mainly in that:

  1. It uses a telescopic boom
  2. Its jib can be raised and lowered to change radius, whereas a hammerhead uses a trolley on a horizontal jib Correct answer.
  3. It has no counterweight
  4. It cannot slew

Explanation

A luffing-jib tower crane changes working radius by raising or lowering the jib, while a hammerhead crane keeps a horizontal jib and moves a trolley along it. Both slew and both use counterweight.

Question 24Crane Types, Components, and Terminology

What is the purpose of the load moment indicator (LMI) on a mobile crane?

  1. It measures load, radius, and boom geometry to warn or stop operation before rated capacity is exceeded Correct answer.
  2. It monitors engine oil pressure
  3. It controls the swing brake
  4. It measures wind speed only

Explanation

The load moment indicator uses sensors for load, radius, boom angle, and length to compute the applied moment and compare it with the load chart, warning or limiting the crane before overload. It is a capacity-safety device, not an engine or brake monitor.

Question 25Site Preparation, Setup, and Ground Conditions

Before a lattice-boom crawler crane is walked onto a prepared pad, which ground condition most directly governs whether the crane can be set up there at all?

  1. The number of trucks waiting to be unloaded at the pad edge
  2. The bearing capacity of the soil beneath each crawler track and any outrigger or mat Correct answer.
  3. The color and compaction of the gravel used to surface the access road
  4. The distance from the pad to the nearest stockpile of spoil

Explanation

Crane stability and track loading depend on the soil's bearing capacity under the tracks, mats, or outriggers; if that capacity is exceeded the crane can settle or tip. Surface appearance, spoil location, and truck traffic do not determine whether the crane can be supported. The pad must be engineered to carry the actual ground-bearing pressure from the crane and load.

Question 26Site Preparation, Setup, and Ground Conditions

A crane is being set up on a site where buried utilities cross the intended pad. What is the correct first action before any mats or outrigger floats are placed?

  1. Assume the utility is deep enough because it is not visible at the surface
  2. Ask the truck driver to drive over the line first to test whether it holds
  3. Locate and mark the utilities, then confirm clearance or relocate the pad before setup Correct answer.
  4. Place the mats directly over the utility line and proceed with setup

Explanation

Buried utilities must be located and marked, and the pad must either clear them or be relocated so the crane's loads do not crush the line. Placing mats over an unmarked line does not remove the hazard. Depth cannot be assumed from surface appearance, and driving over a line is never an acceptable test.

Question 27Site Preparation, Setup, and Ground Conditions

Which setup practice best protects a crane from overturning when the ground is firm but the crane is working near the edge of an excavation?

  1. Set the crawler tracks so they overhang the excavation edge for a shorter boom reach
  2. Rely on the crane's level indicator to warn of edge failure
  3. Backfill the excavation with loose spoil so the crane can sit closer to the edge
  4. Maintain a setback from the edge that accounts for the soil's angle of repose and the crane's load Correct answer.

Explanation

Working near an excavation edge requires a setback based on the soil's angle of repose and the load imposed, because the edge can fail under the crane's weight and moment. Overhanging the edge or backfilling with loose spoil undermines support. A level indicator shows tilt but cannot prevent edge collapse.

Question 28Site Preparation, Setup, and Ground Conditions

During setup, a crane's bubble level shows the carrier is out of level by a small amount. What is the correct response?

  1. Continue and correct the level once the load is in the air
  2. Re-level the crane using the manufacturer's approved method before lifting Correct answer.
  3. Proceed if the lift is small and the boom is kept short
  4. Compensate by adding counterweight to the low side

Explanation

Cranes must be set up level per the manufacturer's instructions because an out-of-level condition shifts load into the boom and swing system and reduces capacity. The condition must be corrected before any lift, not managed during the lift. Adding counterweight does not correct level and can worsen the load.

Question 29Site Preparation, Setup, and Ground Conditions

A crawler crane will be set up on soft ground, and the site engineer specifies crane mats. What is the primary purpose of the mats?

  1. To protect the tracks from abrasive gravel
  2. To spread the crane's track load over a larger area and reduce ground-bearing pressure Correct answer.
  3. To provide a level surface regardless of the underlying soil
  4. To raise the crane so the operator has a better view of the load

Explanation

Crane mats increase the contact area under the tracks, which lowers the ground-bearing pressure to a level the soil can support. They do not create level ground or improve operator visibility. Their function is structural load spreading, not surface protection.

Question 30Site Preparation, Setup, and Ground Conditions

A crane is set up beside a slope, and the site plan shows a potential slope failure zone. Which action is most appropriate before lifting?

  1. Place the crane at the toe of the slope to shorten the boom radius
  2. Proceed if the slope has not moved in the past hour
  3. Have the slope assessed and establish a setback or stabilization before setup Correct answer.
  4. Load the slope with spoil to increase its weight and stability

Explanation

Slope stability must be evaluated by a competent person, and the crane must be set back or the slope stabilized so the crane's load does not trigger failure. Short observation periods do not prove stability, and placing the crane at the toe adds load to the failure zone. Loading a slope with spoil increases driving forces and can cause collapse.

Question 31Site Preparation, Setup, and Ground Conditions

What should be done with the area beneath and around a crane's swing path during setup?

  1. Clear it of obstructions and barricade the swing radius against access Correct answer.
  2. Leave stored material there to save handling time
  3. Place fuel drums inside the swing radius for easy refueling
  4. Allow personnel to cross during slow swings

Explanation

The swing path must be clear of obstructions and barricaded so people are not caught between the rotating superstructure and fixed objects. Stored material in the swing radius creates crushing and struck-by hazards. Personnel access and fuel storage inside the swing radius are both prohibited practices.

Question 32Site Preparation, Setup, and Ground Conditions

A site has been prepared with compacted fill, but the crane's outrigger floats are bearing on a patch of uncompacted fill. What is the most likely consequence if setup proceeds?

  1. The float may punch into the fill, causing the crane to settle or tip Correct answer.
  2. The crane's capacity chart will automatically adjust for the softer ground
  3. The outrigger beam will retract as a protective measure
  4. The fill will compact itself under the first lift and become stable

Explanation

Uncompacted fill lacks the bearing capacity to support the outrigger float, so the float can punch through and allow the crane to settle or tip. Capacity charts do not sense ground conditions, and outrigger beams do not self-retract for protection. Fill does not reliably consolidate under a single lift.

Question 33Site Preparation, Setup, and Ground Conditions

Which document should be consulted to determine the required outrigger float size and the ground pressure the crane will impose?

  1. The operator's personal lifting logbook
  2. The crane manufacturer's load chart and outrigger loading information Correct answer.
  3. The site's daily weather forecast
  4. The delivery schedule for the concrete supplier

Explanation

The manufacturer's load chart and outrigger loading data give the maximum ground-bearing pressure and the float sizes needed to keep that pressure within the soil's capacity. Weather, delivery schedules, and personal logs do not provide structural ground-pressure data. Setup planning must be based on manufacturer-provided loading information.

Question 34Site Preparation, Setup, and Ground Conditions

A crane is set up on a concrete slab whose capacity is unknown. What is the safest approach before placing the outriggers?

  1. Verify the slab's capacity with a structural assessment and use load-spreading mats as needed Correct answer.
  2. Cut a hole in the slab so the outrigger can bear on the soil below
  3. Assume any concrete slab can carry a crane because concrete is strong
  4. Place the outriggers directly on the slab and watch for cracking during the lift

Explanation

Concrete slabs, especially those over basements or voids, may not be designed for concentrated outrigger loads, so their capacity must be verified and load spread as needed. Assuming strength or watching for cracking during a lift is reactive and unsafe. Cutting holes weakens the slab and is not a valid load-spreading method.

Question 35Site Preparation, Setup, and Ground Conditions

What is the purpose of maintaining a specific distance between a crane's tracks and a trench or pit during setup?

  1. To reduce the noise reaching workers in the trench
  2. To keep the crane's exhaust away from the trench bottom
  3. To keep the crane's load outside the zone where the excavation wall could fail Correct answer.
  4. To make room for the spoil pile between the crane and the trench

Explanation

The setback keeps the crane's weight and moment outside the soil wedge that could fail and collapse the excavation wall. Noise, exhaust, and spoil storage are not the structural reason for the setback. The distance is determined by soil type, depth, and the crane loading.

Question 36Site Preparation, Setup, and Ground Conditions

A crane will be set up on a site where the ground is frozen at the surface but soft below. What is the key concern?

  1. The crane's hydraulic oil will freeze and lock the outriggers
  2. The frozen surface will prevent the crane from being leveled
  3. Frozen ground always has higher capacity than unfrozen ground at all depths
  4. The frozen crust may break through under the crane, exposing the soft ground below Correct answer.

Explanation

A thin frozen crust can give a false impression of strength and may punch through under concentrated crane loads, revealing the soft soil beneath. Frozen ground is not uniformly stronger at depth. Hydraulic oil and leveling are not the primary structural concern.

Question 37Site Preparation, Setup, and Ground Conditions

Which condition in a crane's setup area requires the crane to be relocated rather than merely re-leveled?

  1. A void or mine working beneath the pad that cannot be verified as stable Correct answer.
  2. A small puddle on the surface of the pad
  3. A slight slope in the pad that can be corrected with blocking
  4. A loose bolt on the crane's handrail

Explanation

An unverified void under the pad can collapse without warning and cannot be corrected by re-leveling, so the crane must be relocated. A puddle, a handrail bolt, and a correctable slope are maintenance or leveling issues. Relocation is reserved for conditions that cannot be made safe in place.

Question 38Site Preparation, Setup, and Ground Conditions

During setup, a crane's outrigger is extended over a live traffic lane. What control is required?

  1. Instruct the flagger to wave vehicles through quickly
  2. Barricade the lane and stop traffic under and around the outrigger before setup Correct answer.
  3. Place cones only at the far end of the lane
  4. Allow traffic to continue if vehicles are smaller than the outrigger beam

Explanation

An outrigger extended over a traffic lane creates a struck-by and clearance hazard, so the lane must be closed and barricaded before setup. Vehicle size does not make passing under an outrigger safe. Cones at one end and rapid waving do not control the hazard.

Question 39Site Preparation, Setup, and Ground Conditions

What is the correct way to handle surface water at a crane pad before setup?

  1. Place mats directly over standing water and proceed
  2. Ignore it because water drains away during the lift
  3. Drain or divert the water and confirm the soil is stable before placing mats Correct answer.
  4. Pump water onto the pad to soften the soil for better mat seating

Explanation

Standing water softens and weakens soil, so it must be drained or diverted and the soil confirmed stable before mats are placed. Adding water reduces bearing capacity. Water does not reliably drain during a lift, and mats over standing water can float or sink unevenly.

Question 40Site Preparation, Setup, and Ground Conditions

A crane is set up on a pad that meets bearing capacity requirements, but the pad is adjacent to a buried septic tank. What is the appropriate action?

  1. Proceed because the tank is not a utility line
  2. Place the outrigger directly over the tank lid for even load distribution
  3. Treat the tank as a void and relocate the crane or bridge it with an engineered solution Correct answer.
  4. Assume the tank is full and therefore solid enough to support the crane

Explanation

A buried tank is a void that can collapse under crane loads regardless of whether it is full, so the crane must be relocated or the area bridged with an engineered design. Assuming contents provide support is unsafe. Placing an outrigger over the lid concentrates load on the weakest point.

Question 41Site Preparation, Setup, and Ground Conditions

Which factor most affects the size of crane mats needed for a given setup?

  1. The color of the mats and the site's landscaping plan
  2. The number of workers available to carry the mats
  3. The crane's maximum ground-bearing pressure and the soil's allowable bearing capacity Correct answer.
  4. The distance from the pad to the site office

Explanation

Mat size is governed by the need to reduce the crane's ground-bearing pressure to within the soil's allowable capacity, so both values must be known. Color, labor, and office distance do not affect the structural design. The mat area required is calculated from the load and the soil capacity.

Question 42Site Preparation, Setup, and Ground Conditions

Before a crane is assembled on site, what should be confirmed about the assembly area?

  1. That it is level, stable, and large enough for the boom and jib sections to be laid out Correct answer.
  2. That it is close to the site gate so trucks can be unloaded quickly
  3. That it has a view of the entire site for the operator
  4. That it is shaded during the hottest part of the day

Explanation

The assembly area must be level and stable to support the crane during assembly and large enough to lay out boom and jib sections without obstruction. Proximity to the gate, operator view, and shade are conveniences, not assembly requirements. An inadequate assembly area can cause the crane to shift during assembly.

Question 43Site Preparation, Setup, and Ground Conditions

A crane is set up on a site with overhead power lines near the intended boom path. What setup control applies?

  1. Rely on the operator to see the lines from the cab
  2. Establish and mark the required clearance distance and use a spotter before operating Correct answer.
  3. Set up as planned and address the lines only if the boom contacts one
  4. Lower the boom below the lines and proceed without marking

Explanation

Overhead lines require a marked clearance distance and a spotter to keep the boom and load outside that zone. Lowering the boom without marking does not control the hazard. The operator's view is often obstructed, and waiting for contact is too late.

Question 44Site Preparation, Setup, and Ground Conditions

A crane's setup pad is on a slope that cannot be eliminated, and the manufacturer permits operation only on level ground. What is the correct conclusion?

  1. The crane can operate if the slope is less than five degrees
  2. The crane cannot be operated there until the pad is made level within the manufacturer's tolerance Correct answer.
  3. The crane can operate if the operator reduces swing speed
  4. The crane can operate if the load is kept on the uphill side

Explanation

If the manufacturer requires level ground, the pad must be brought within that tolerance before operation; there is no workaround based on load position or swing speed. Load placement and slower swing do not correct the capacity reduction caused by slope. A specific slope limit must come from the manufacturer, not from assumption.

Question 45Site Preparation, Setup, and Ground Conditions

Why is it important to confirm that the crane's outrigger floats are fully deployed and pinned before lifting?

  1. The float is a cosmetic component that does not affect stability
  2. The float only affects the crane's travel speed on site
  3. A partially deployed float improves the crane's capacity by lowering the center of gravity
  4. A partially deployed float reduces the support base and can allow the crane to tip Correct answer.

Explanation

Outrigger floats must be fully deployed and secured so the crane's support base matches the load chart assumptions. A partially deployed float narrows the base and can cause tipping. Floats are structural stability components, not cosmetic or travel-related items.

Question 46Site Preparation, Setup, and Ground Conditions

A site has a known area of undocumented fill of unknown composition. What is the most appropriate setup decision?

  1. Treat the area as unsuitable until it is investigated and proven capable of supporting the crane Correct answer.
  2. Assume the fill is suitable because it has been there for years
  3. Compact the fill by driving the crane over it repeatedly
  4. Set up on the fill and monitor settlement during the first lift

Explanation

Undocumented fill of unknown composition cannot be assumed to have adequate bearing capacity, so it must be investigated and proven suitable before setup. Age does not confirm capacity. Monitoring settlement during a lift is reactive, and driving a crane over fill does not provide verified compaction.

Question 47Site Preparation, Setup, and Ground Conditions

What is the purpose of a site-specific lift plan review before crane setup?

  1. To satisfy a paperwork requirement that has no effect on the lift
  2. To confirm ground conditions, clearances, and load chart assumptions match the actual setup location Correct answer.
  3. To replace the need for a competent person to inspect the ground
  4. To allow the operator to exceed the load chart for a single lift

Explanation

The lift plan review verifies that the planned setup matches actual ground conditions, clearances, and load chart assumptions at the location. It is not mere paperwork and does not replace ground inspection by a competent person. It never authorizes exceeding the load chart.

Question 48Site Preparation, Setup, and Ground Conditions

During setup, a crane's tracks are bearing on a mix of firm soil and a soft patch. What is the most appropriate action?

  1. Increase engine speed to lift the load faster before settlement occurs
  2. Place a single small block under the soft patch and continue
  3. Improve or bridge the soft patch so support is uniform across the tracks Correct answer.
  4. Proceed because the firm soil will carry most of the load

Explanation

Non-uniform support causes the crane to tilt and concentrates load on part of the tracks, so the soft patch must be improved or bridged to provide uniform bearing. Relying on adjacent firm soil does not prevent settlement. A single small block is inadequate, and lifting faster does not address ground failure.

Question 49Load Charts, Capacity, and Rigging Math

On a crane load chart, the capacity listed for a given boom length, radius, and boom angle already accounts for which of the following?

  1. The weight of the load only, with rigging added by the operator
  2. The weight of the load block and other lifting attachments Correct answer.
  3. The weight of the carrier counterweight only
  4. The weight of the operator and fuel

Explanation

Rated capacities on most manufacturer load charts are net capacities, meaning the published value already deducts the weight of the hook block, slings, and other lifting attachments. The operator must still subtract the weight of any rigging not included in the chart deduction. Confusing gross and net capacity is a common cause of overload.

Question 50Load Charts, Capacity, and Rigging Math

A load chart shows a rated capacity of 12,000 lb at a 20 ft radius. The hook block weighs 500 lb and the rigging weighs 300 lb. What is the maximum load weight that may be lifted?

  1. 12,800 lb
  2. 11,200 lb Correct answer.
  3. 12,000 lb
  4. 11,500 lb

Explanation

When the chart states a net capacity, the block and rigging are already deducted, so the allowable load is the chart value minus only rigging not included in the deduction. Using the full deduction of 800 lb gives 12,000 - 800 = 11,200 lb. Always confirm whether the chart is gross or net before deducting.