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HEO Crawler Crane NC III study materials
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HEO Crawler Crane NC III practice questions

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Question 1Pre-operation inspection of crawler crane and accessories

Before starting the daily inspection of a crawler crane, what should the operator do first regarding the machine's condition?

  1. Extend the crawler tracks fully to expose the rollers
  2. Lower the boom onto the ground without setting the brakes
  3. Park it on level ground with the engine off and controls neutral Correct answer.
  4. Run the engine at high idle to warm the hydraulic oil

Explanation

Pre-operation inspection begins with the crane in a safe, stable configuration: level ground, engine stopped, controls in neutral, and the parking brake applied. This prevents unexpected movement and lets the operator check fluid levels and components accurately.

Question 2Pre-operation inspection of crawler crane and accessories

When checking the engine oil level on a crawler crane before a shift, the dipstick reading should be:

  1. Above the full mark to allow for consumption
  2. Ignored if the oil looks clean
  3. Between the low and full marks with the machine level Correct answer.
  4. Read immediately after high-speed operation

Explanation

Engine oil is checked with the machine level and the engine stopped so the reading reflects true sump level. The correct range is between the low and full marks; overfilling or underfilling both risk damage.

Question 3Pre-operation inspection of crawler crane and accessories

During the walk-around inspection, a crawler crane's track shoes show missing bolts and a cracked pad. What is the correct action?

  1. Tag the crane out of service until the track is repaired Correct answer.
  2. Continue the shift and report it at the end of the week
  3. Operate at reduced load and monitor the pad
  4. Tighten the remaining bolts and proceed

Explanation

Cracked or missing track components compromise the undercarriage and can fail under load, so the crane must be removed from service until repaired. Continuing operation risks derailment or structural failure.

Question 4Pre-operation inspection of crawler crane and accessories

Which check confirms the crawler crane's hydraulic system is free of external leaks before operation?

  1. Listening for pump noise at full throttle
  2. Measuring track sag with a straight edge
  3. Checking the coolant recovery bottle level
  4. Inspecting hoses, fittings, and cylinders for weeping or pooled oil Correct answer.

Explanation

External hydraulic leaks are found by visually inspecting hoses, fittings, cylinders, and the ground beneath the machine for weeping or pooled oil. This is a direct check of the hydraulic circuit's integrity.

Question 5Pre-operation inspection of crawler crane and accessories

What is the purpose of checking the wire rope for broken wires and kinks during pre-operation inspection?

  1. To measure the boom length
  2. To detect rope damage that reduces strength and may cause failure Correct answer.
  3. To confirm the rope is the correct color
  4. To verify the hook latch is closed

Explanation

Broken wires, kinks, and birdcaging reduce a wire rope's load capacity and can lead to sudden failure. Inspecting for these defects protects against rope breakage during lifting.

Question 6Pre-operation inspection of crawler crane and accessories

Before operating, the operator finds the crane's load moment indicator (LMI) display is blank when the engine is started. What should be done?

  1. Reset the breaker and continue if it powers up briefly
  2. Use a hand-held angle indicator instead
  3. Stop and have the LMI fault diagnosed before lifting Correct answer.
  4. Lift only light loads while watching the boom

Explanation

The LMI is a safety device that warns of overload and must function correctly before any lift. A blank display means the system cannot be relied on, so the crane must not be operated until repaired.

Question 7Pre-operation inspection of crawler crane and accessories

When inspecting the hook block of a crawler crane, which condition requires the hook to be removed from service?

  1. A recently greased swivel bearing
  2. Light surface rust on the shank
  3. A latch that opens and closes freely
  4. A hook throat opening stretched beyond the manufacturer's limit Correct answer.

Explanation

A hook whose throat has opened beyond the allowable limit has been overloaded or deformed and must be replaced. Surface rust and normal latch operation do not condemn a hook.

Question 8Pre-operation inspection of crawler crane and accessories

The pre-operation inspection of a crawler crane's outrigger-style boom dolly or counterweight bolts reveals loose fasteners. Why must they be torqued before lifting?

  1. They reduce the engine oil pressure
  2. They only affect paint wear on the counterweight
  3. Loose fasteners can allow the counterweight to shift and destabilize the crane Correct answer.
  4. They change the color of the load chart

Explanation

Counterweight fasteners secure a large mass that balances the crane; if loose, the weight can shift and alter stability during a lift. Torquing them to specification prevents movement and potential tipping.

Question 9Pre-operation inspection of crawler crane and accessories

During inspection, the boom hoist wire rope shows several broken wires clustered in one strand within a lay length. What does this indicate?

  1. A sign the rope is over-lubricated
  2. Normal wear that needs no attention
  3. That the boom angle is set too low
  4. Localized rope damage that may require removal per rejection criteria Correct answer.

Explanation

Clustered broken wires within a lay length indicate concentrated damage that weakens the rope and often exceeds rejection criteria. Such damage must be evaluated against the removal standard before use.

Question 10Pre-operation inspection of crawler crane and accessories

What should the operator check regarding the crane's fire extinguisher during pre-operation inspection?

  1. That it is stored in the cab glovebox
  2. That it has been used at least once
  3. That it is present, charged, and within its inspection date Correct answer.
  4. That it matches the crane's paint color

Explanation

A fire extinguisher must be on board, properly charged, and within its service date to be effective in an emergency. This is a required safety item on the pre-operation checklist.

Question 11Pre-operation inspection of crawler crane and accessories

When checking the crawler crane's coolant level, the operator should:

  1. Check the recovery bottle with the engine cool Correct answer.
  2. Ignore the level if the temperature gauge reads normal
  3. Top up with hydraulic oil if coolant is low
  4. Open the radiator cap while the engine is hot

Explanation

Coolant is checked at the recovery bottle with the engine cool to avoid burns from pressurized hot coolant. The level should be between the marked lines.

Question 12Pre-operation inspection of crawler crane and accessories

The operator notices the crane's horn does not sound during the pre-operation function test. Why is this a concern for lifting operations?

  1. The horn controls the boom hoist brake
  2. The horn measures wind speed
  3. The horn charges the battery during operation
  4. The horn is an audible warning device required for safe site communication Correct answer.

Explanation

The horn provides an audible warning to personnel on site, especially before moving or lifting. A non-functioning horn removes a required communication and warning safeguard.

Question 13Pre-operation inspection of crawler crane and accessories

During inspection, the operator finds the crane's swing brake does not hold when the control is released on level ground. What is the appropriate response?

  1. Compensate by counter-swinging manually
  2. Operate with slow swing speeds only
  3. Remove the crane from service until the swing brake is repaired Correct answer.
  4. Increase engine speed to improve braking

Explanation

A swing brake that fails to hold allows uncontrolled rotation of the upper structure, which is a serious hazard. The crane must be tagged out until the brake is repaired and tested.

Question 14Pre-operation inspection of crawler crane and accessories

What is the correct way to verify the crane's boom angle indicator reads accurately before a lift?

  1. Check it only after the load is lifted
  2. Compare the indicated angle with a measured angle at a known boom position Correct answer.
  3. Assume it is accurate if the needle moves
  4. Compare it with the engine tachometer

Explanation

The boom angle indicator must be verified against an actual measured angle so the operator can trust the reading for load chart use. Comparing at a known position confirms calibration.

Question 15Pre-operation inspection of crawler crane and accessories

Before the shift, the operator finds the crane's anti-two-block device is bypassed with a jumper wire. What is the correct action?

  1. Remove the bypass and confirm the device functions before lifting Correct answer.
  2. Bypass it further to avoid nuisance alarms
  3. Report it at the end of the month
  4. Leave it bypassed if lifts are kept low

Explanation

The anti-two-block device prevents the hook block from contacting the boom tip, which can cause rope failure and dropped loads. A bypassed device must be restored and function-tested before any lifting.

Question 16Pre-operation inspection of crawler crane and accessories

When inspecting crawler track tension, the operator should follow the manufacturer's procedure because:

  1. Incorrect tension accelerates wear and can cause derailment Correct answer.
  2. Looser tracks increase engine power
  3. Tighter tracks always improve lifting capacity
  4. Track tension affects the horn volume

Explanation

Track tension must match the manufacturer's specification; too tight or too loose accelerates undercarriage wear and can lead to derailment. The specified procedure accounts for machine model and conditions.

Question 17Pre-operation inspection of crawler crane and accessories

The operator observes the crane's seat belt is frayed and the buckle does not latch securely. Why must this be corrected before operating?

  1. The seat belt adjusts the boom angle
  2. The seat belt lubricates the swing gear
  3. The seat belt restrains the operator during sudden movements and tip-over Correct answer.
  4. The seat belt powers the LMI

Explanation

A damaged seat belt cannot restrain the operator during sudden stops, swings, or a tip-over, increasing injury risk. It must be replaced before the crane is operated.

Question 18Pre-operation inspection of crawler crane and accessories

During the pre-operation inspection, the operator notices hydraulic fluid weeping at a boom cylinder gland. What does this most likely indicate?

  1. A seal or gland problem that could worsen under pressure Correct answer.
  2. That the boom is too long
  3. Normal operation that needs no action
  4. That the hydraulic oil is too cold

Explanation

Weeping at a cylinder gland suggests a seal or packing defect that can escalate to a major leak under load. It should be reported and repaired before the cylinder is pressurized in lifting.

Question 19Pre-operation inspection of crawler crane and accessories

What should be confirmed about the crane's load chart and rated capacity indicator before the first lift of the shift?

  1. The load chart is stored in the toolbox
  2. The load chart lists the engine oil capacity
  3. The load chart matches the crane's current boom and counterweight configuration Correct answer.
  4. The load chart is printed in color

Explanation

The load chart must correspond to the actual boom length, jib, and counterweight configuration on the machine, otherwise capacity figures are invalid. The operator verifies the chart matches the setup before lifting.

Question 20Pre-operation inspection of crawler crane and accessories

The crane's boom pivot pins show excessive play and the keeper plates are missing. Why is this a critical finding?

  1. It only affects the crane's appearance
  2. The boom could shift or disconnect under load without retained pins Correct answer.
  3. It improves boom flexibility
  4. It reduces fuel consumption

Explanation

Boom pivot pins transfer major structural loads, and missing keepers allow pins to migrate out, risking boom separation. Excessive play with missing retainers requires correction before lifting.

Question 21Pre-operation inspection of crawler crane and accessories

During inspection, the operator finds the crane's level indicator (bubble level) is missing from the cab. Why does this matter for a crawler crane?

  1. The level indicator measures hydraulic pressure
  2. The level indicator controls the horn
  3. The level indicator charges the battery
  4. Operating on unlevel ground affects stability and rated capacity Correct answer.

Explanation

Crawler cranes must operate on ground within specified slope limits, and a level indicator helps the operator confirm this. Without it, the operator may unknowingly work on a slope that reduces stability and invalidates capacity assumptions.

Question 22Pre-operation inspection of crawler crane and accessories

An operator finds the crane's boom hoist drum pawl (ratchet) does not engage during the inspection. What is the correct interpretation?

  1. The pawl filters hydraulic oil
  2. The pawl controls swing speed
  3. The pawl is only decorative and can be ignored
  4. A secondary holding device is defective and must be repaired before operation Correct answer.

Explanation

The boom hoist pawl is a secondary holding device that prevents the boom from falling if the hoist brake or drive fails. If it does not engage, the crane must not be operated until repaired.

Question 23Pre-operation inspection of crawler crane and accessories

Before operating, the operator inspects the crane's electrical wiring and finds exposed conductors near the boom foot. Why must this be corrected?

  1. It improves electrical conductivity
  2. Exposed wiring can cause shorts, fire, or loss of safety device power Correct answer.
  3. It only affects radio reception
  4. It is required for the LMI to calibrate

Explanation

Exposed conductors near structural movement points can short against the boom, causing fire or loss of power to safety devices such as the LMI. Insulation must be restored before operation.

Question 24Pre-operation inspection of crawler crane and accessories

What is the purpose of checking the crane's air cleaner restriction indicator during pre-operation inspection?

  1. To verify the swing brake holding force
  2. To check the track shoe bolt torque
  3. To confirm the engine is receiving adequate intake air Correct answer.
  4. To measure hydraulic oil temperature

Explanation

The air cleaner restriction indicator shows whether the intake filter is clogged and restricting airflow to the engine. A high restriction reading signals the filter needs service to maintain engine performance.

Question 25Pre-operation inspection of crawler crane and accessories

The operator finds the crane's boom angle limiting device (upper limit) is set but the boom stops are bent and cracked. What is the correct action?

  1. Operate only with the boom below horizontal
  2. Remove the crane from service until the boom stops are repaired Correct answer.
  3. Rely on the limiting device and operate normally
  4. Weld the stops temporarily and lift at reduced capacity

Explanation

Boom stops are a structural backstop that limits boom elevation; bent or cracked stops indicate they may fail to arrest the boom. The crane must be removed from service until they are repaired, regardless of the limiting device.

Question 26Pre-operation inspection of crawler crane and accessories

During the pre-operation inspection of a crawler crane, the operator finds that the tracks are packed with dried mud and the drive sprocket teeth are worn to a sharp point. Which action best reflects correct inspection practice?

  1. Loosen the track tension to compensate for the worn sprocket teeth
  2. Reverse the tracks to redistribute the wear and resume work immediately
  3. Record the finding, clean the tracks, and report the worn sprocket so the undercarriage is assessed before operation Correct answer.
  4. Continue the shift because track wear does not affect lifting capacity

Explanation

Undercarriage condition affects travel stability and track retention, so any worn drive sprocket must be documented and evaluated by a qualified person before the crane is used. Cleaning the tracks also allows a proper inspection of pins, bushings, and seals. Simply continuing work hides a developing failure that can strand or destabilize the machine.

Question 27Pre-operation inspection of crawler crane and accessories

What is the main reason the operator checks the crawler crane's hydraulic oil sight glass and reservoir level before the first lift of the shift?

  1. To measure the oil temperature for the load chart
  2. To check whether the oil is the cheapest grade available
  3. To confirm the oil is at the specified level so pumps and cylinders do not cavitate or lose function during the lift Correct answer.
  4. To verify that the oil has been changed at the correct service interval

Explanation

A low reservoir level can allow the pump to draw air, causing cavitation, sluggish boom or swing response, and possible loss of control under load. Checking the sight glass before the shift confirms the system has the volume needed for the planned operations. Oil condition and service intervals are separate checks and do not replace the level check.

Question 28Pre-operation inspection of crawler crane and accessories

While inspecting a crawler crane before work, the operator finds the boom hoist wire rope has a pronounced kink and a birdcage (distorted) section near the drum. What is the most appropriate response?

  1. Straighten the kink by hand and continue operating with reduced load
  2. Apply lubricant to the distorted section and monitor it during the shift
  3. Remove the crane from service and have the damaged rope section evaluated and replaced per the manufacturer's criteria Correct answer.
  4. Shorten the rope by cutting off the distorted end and reterminating it on site

Explanation

Kinks and birdcaging are structural distortions that permanently damage rope strands and reduce strength, so the rope must be assessed against rejection criteria and replaced if it does not comply. Field repairs such as straightening or cutting do not restore the rope's rated strength. Continuing to lift with a distorted boom hoist rope risks sudden failure under load.

Question 29Pre-operation inspection of crawler crane and accessories

During the pre-operation walkaround, the operator notices the crawler crane's boom backstops are deformed and one mounting bolt is missing. Why must this be corrected before operating?

  1. The backstops hold the boom up when the hoist rope is removed
  2. The backstops prevent the crane from traveling on a slope
  3. The backstops limit how far the boom can be lowered and protect against boom damage or collapse if the boom is over-lowered Correct answer.
  4. The backstops are part of the rated capacity calculation in the load chart

Explanation

Boom backstops are structural stops that arrest the boom if it is lowered too far, protecting the boom and the machine from damage. Deformed stops and missing fasteners mean the protection is compromised and the boom could be damaged or collapse. The condition must be repaired to the manufacturer's specification before lifting resumes.

Question 30Pre-operation inspection of crawler crane and accessories

An operator is preparing a crawler crane for a shift on soft ground and must decide whether the machine's load moment indicator (LMI) calibration and the level of the crane's base are both acceptable. The LMI shows a calibration sticker that expired two months ago, and the bubble level shows the crane slightly out of level. Which course of action is correct?

  1. Do not operate the crane; have the LMI recalibrated by a qualified person and level the machine before any lift Correct answer.
  2. Level the machine and begin lifting, since the calibration sticker is only an administrative record
  3. Operate normally because a slight out-of-level condition is within the LMI's automatic compensation
  4. Operate at reduced capacity to compensate for the expired calibration and slight out-of-level condition

Explanation

The LMI must be calibrated within the interval set by the manufacturer and applicable regulations, because an out-of-date calibration means the displayed load and radius data cannot be trusted. Out-of-level operation also changes the actual load geometry and can overload the crane. Both conditions must be corrected before any lift is made.

Question 31Site preparation, rigging, and load handling planning

Before a crawler crane is positioned for a lift, which document defines the crane's rated capacity at the planned radius and boom length?

  1. The rigging hardware catalogue page
  2. The site's daily attendance sheet
  3. The load chart issued for that crane model and configuration Correct answer.
  4. The delivery receipt for the counterweight blocks

Explanation

Rated capacity is read from the manufacturer's load chart for the specific crane model, boom length, radius, and configuration. No other site document establishes the legal capacity limit for the planned pick.

Question 32Site preparation, rigging, and load handling planning

Ground bearing pressure under a crawler crane's track is best reduced by which measure?

  1. Lowering the counterweight to the ground
  2. Spreading the load with timber or steel mats under the tracks Correct answer.
  3. Increasing boom length before the lift
  4. Reducing the swing speed during the pick

Explanation

Load-bearing mats or crane pads distribute the track load over a larger area, lowering pressure on the subsoil. Boom length, counterweight position, and swing speed do not change the bearing pressure transmitted through the tracks.

Question 33Site preparation, rigging, and load handling planning

What is the primary purpose of a site-specific lift plan?

  1. To replace the need for a competent signal person
  2. To satisfy the client's invoicing requirements
  3. To identify hazards and control measures before the lift proceeds Correct answer.
  4. To record the operator's daily hours

Explanation

A lift plan documents the load, radius, capacity, ground conditions, rigging, and controls for identified hazards. It is a planning and safety tool, not a billing or timekeeping record, and it never removes the need for a signal person.

Question 34Site preparation, rigging, and load handling planning

A load weighs 3.0 tonnes and the rigging assembly weighs 0.4 tonnes. What total load must be compared against the crane's rated capacity?

  1. 0.4 tonnes
  2. 3.0 tonnes
  3. 2.6 tonnes
  4. 3.4 tonnes Correct answer.

Explanation

The gross load includes the payload plus all rigging and lifting attachments below the hook. Adding 3.0 and 0.4 tonnes gives 3.4 tonnes, which is the figure compared with rated capacity.

Question 35Site preparation, rigging, and load handling planning

Which sling configuration increases the tension in each leg compared with a single vertical leg carrying the same load?

  1. A two-leg sling with legs at a wide included angle Correct answer.
  2. A choker hitch on a vertical drop
  3. A single vertical sling
  4. A basket hitch on a vertical drop

Explanation

As the included angle between sling legs widens, the tension in each leg rises for the same vertical load. A two-leg sling at a wide angle therefore carries more tension per leg than a single vertical sling.

Question 36Site preparation, rigging, and load handling planning

Why must the crane's outriggers or tracks be kept clear of excavations and backfilled trenches?

  1. To prevent the crane from blocking site traffic
  2. To keep the crane's paintwork clean
  3. Because the load chart prohibits lifting near trenches
  4. Because nearby excavation reduces soil bearing capacity and can cause collapse Correct answer.

Explanation

Excavations and backfill reduce the soil's ability to support the crane's load, and track loads can trigger edge collapse. Setback distances are established during site assessment to keep the crane on competent ground.

Question 37Site preparation, rigging, and load handling planning

What does the term 'radius' mean when reading a crawler crane load chart?

  1. The horizontal distance from the crane's rotation centre to the load's centre of gravity Correct answer.
  2. The vertical height of the boom tip above ground
  3. The length of the pendant lines supporting the boom
  4. The distance from the boom foot pin to the boom tip

Explanation

Radius is measured horizontally from the crane's rotation centre to the centre of gravity of the load, not along the boom. Capacity decreases as this horizontal distance increases.

Question 38Site preparation, rigging, and load handling planning

A load must be landed on a roof edge where the operator's view is obstructed. What is the correct control?

  1. Ask the roof workers to catch the load by hand
  2. Use a qualified signal person in communication with the operator Correct answer.
  3. Rely on the operator's experience to judge the landing
  4. Increase swing speed to shorten exposure time

Explanation

When the operator cannot see the landing point, a qualified signal person must direct the movement using agreed signals. Experience alone and speed increases do not provide the required control, and manual catching of loads is prohibited.

Question 39Site preparation, rigging, and load handling planning

Which factor most directly reduces a crane's rated capacity when all other parameters remain constant?

  1. Increasing the load radius Correct answer.
  2. Adding a second signal person
  3. Shortening the boom
  4. Reducing wind speed

Explanation

Rated capacity falls as radius increases because the overturning moment grows. Additional signal persons, lower wind, and shorter boom do not reduce capacity in the same way.

Question 40Site preparation, rigging, and load handling planning

What is the main risk of using a sling with a damaged or missing identification tag?

  1. The sling will be too short for the lift
  2. The sling's rated capacity cannot be verified before use Correct answer.
  3. The sling will not fit the hook
  4. The sling may be the wrong colour for the site

Explanation

Without a legible tag the working load limit cannot be confirmed, so the sling must be removed from service. Colour, length, and hook fit are secondary to verified capacity.

Question 41Site preparation, rigging, and load handling planning

When is it acceptable to exceed the rated capacity shown on the load chart?

  1. When the lift is short in duration
  2. Never under normal lifting operations Correct answer.
  3. When the wind is below 5 km/h
  4. When an experienced operator is at the controls

Explanation

The load chart defines the maximum permitted load for the configuration, and exceeding it removes the crane's designed margin of stability. Duration, operator experience, and light wind do not justify overloading.

Question 42Site preparation, rigging, and load handling planning

A bundle of steel pipes is to be lifted with two slings in a basket hitch. What must be confirmed before the lift?

  1. That the crane is facing north
  2. That the bundle is secured so individual pipes cannot slide out Correct answer.
  3. That the slings are longer than the bundle
  4. That the pipes are painted a contrasting colour

Explanation

Bundled loads can shift or spill if not restrained, so the bundle must be secured before lifting. Colour, sling length relative to the bundle, and crane orientation do not control the spill hazard.

Question 43Site preparation, rigging, and load handling planning

What does a 'blind lift' require in addition to a normal lift plan?

  1. Automatic load release at the landing point
  2. A documented communication method with a signal person who can see the load Correct answer.
  3. A larger counterweight
  4. Direct visual contact between operator and load at all times

Explanation

A blind lift occurs when the operator cannot see the load, so a reliable communication link with a person who can see it is essential. Counterweight, direct sight, and automatic release are not requirements and some are impractical.

Question 44Site preparation, rigging, and load handling planning

Why is a trial lift of a few centimetres performed at the start of a lift?

  1. To warm up the crane's hydraulic oil
  2. To test the site's public address system
  3. To measure the exact wind speed at the boom tip
  4. To confirm load balance, rigging security, and brake holding before the full lift Correct answer.

Explanation

A short trial lift reveals load shift, sling adjustment needs, and brake performance while the load is still close to the ground. It is a verification step, not a warm-up or measurement exercise.

Question 45Site preparation, rigging, and load handling planning

Which condition requires the lift to be stopped and reassessed?

  1. Wind speed rising above the limit stated in the lift plan Correct answer.
  2. The signal person wearing high-visibility clothing
  3. The load being landed within the planned radius
  4. The operator completing a pre-start checklist

Explanation

Exceeding the wind limit in the lift plan changes the load and control assumptions, so the lift must stop and be reassessed. The other options are normal, required practices rather than stopping conditions.

Question 46Site preparation, rigging, and load handling planning

What is the purpose of a load moment indicator or rated capacity limiter on a crawler crane?

  1. To record fuel consumption
  2. To warn and limit operation as the crane approaches its rated capacity Correct answer.
  3. To measure the exact weight of the counterweight
  4. To control the swing brake automatically

Explanation

The device monitors load and geometry and warns or stops operation before the rated capacity is exceeded. It does not measure fuel, counterweight, or swing brake function.

Question 47Site preparation, rigging, and load handling planning

When planning a tandem lift with two crawler cranes, what must be established for each crane?

  1. That each crane's share of the load is within its rated capacity at its own radius Correct answer.
  2. That both operators have the same years of experience
  3. That both cranes face the same direction
  4. That both cranes use identical boom lengths

Explanation

In a tandem lift the load share carried by each crane depends on geometry and must be checked against that crane's capacity at its radius. Identical boom lengths, experience, and orientation are not the governing requirement.

Question 48Site preparation, rigging, and load handling planning

A load's centre of gravity is offset well to one side of the hook. What is the consequence if this is not corrected?

  1. The load will hang tilted and may swing or shift unpredictably Correct answer.
  2. The load radius is automatically reduced
  3. The sling working load limit increases
  4. The crane's fuel efficiency improves

Explanation

An off-centre centre of gravity causes the load to hang out of level, creating uncontrolled swing and potential load shift. It does not improve efficiency, increase sling ratings, or reduce radius automatically.

Question 49Site preparation, rigging, and load handling planning

Which practice is correct when landing a load on a prepared set of dunnage?

  1. Release the slings as soon as the load touches the dunnage
  2. Drop the load the last metre to settle it
  3. Signal the operator to swing away before the load is stable
  4. Lower slowly and confirm the load is stable before releasing the slings Correct answer.

Explanation

The load must be lowered under control and confirmed stable before slings are released, so that no one is exposed to a shifting load. Releasing early, dropping, or swinging away prematurely can cause the load to topple.

Question 50Site preparation, rigging, and load handling planning

What information must a rigger confirm about a shackle before using it in a lift?

  1. Its country of manufacture
  2. Its paint colour matches the sling
  3. Its purchase order number
  4. Its working load limit and that the pin is fully engaged Correct answer.

Explanation

A shackle must have a working load limit adequate for the applied load and a pin that is fully engaged and secured. Colour, origin, and paperwork are not the operative checks for safe use.