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High Risk Work Licence - Non-Slewing Mobile Crane CN study materials
High Risk Work Licence - Non-Slewing Mobile Crane CN study resources

High Risk Work Licence - Non-Slewing Mobile Crane CN practice questions

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Question 1Legislative and regulatory requirements, duty of care, and licensing obligations

Under the model WHS Regulations, what must a person conducting a business or undertaking do before allowing a worker to operate a non-slewing mobile crane that requires a high risk work licence?

  1. Accept a statement of attainment from any registered training organisation
  2. Record the worker's years of experience in the site diary
  3. Verify the worker holds the correct class of high risk work licence Correct answer.
  4. Rely on the worker's verbal assurance of competency

Explanation

A PCBU must ensure that high risk work is carried out only by a person who holds the relevant high risk work licence for that class of work. Checking the licence details, including its class and expiry, is a positive verification step. A statement of attainment or claimed experience does not substitute for a current licence.

Question 2Legislative and regulatory requirements, duty of care, and licensing obligations

Which class of high risk work licence authorises a person to operate a non-slewing mobile crane with a capacity greater than three tonnes?

  1. Basic rigging (RB)
  2. Non-slewing mobile crane (CN) Correct answer.
  3. Dogging (DG)
  4. Concrete placing boom (PB)

Explanation

The CN class covers non-slewing mobile cranes with a rated capacity greater than three tonnes. Dogging and rigging classes cover load handling and rigging activities rather than crane operation. The PB class applies to concrete placing booms, which is a separate item of plant.

Question 3Legislative and regulatory requirements, duty of care, and licensing obligations

What is the primary duty of care owed by a person conducting a business or undertaking under WHS law?

  1. To ensure health and safety so far as is reasonably practicable Correct answer.
  2. To provide insurance covering all foreseeable injuries
  3. To eliminate every hazard on the site regardless of cost
  4. To delegate all safety decisions to the principal contractor

Explanation

The primary duty requires a PCBU to ensure the health and safety of workers and others affected by the business so far as is reasonably practicable. This involves weighing likelihood and severity of harm against what is reasonably able to be done. It is not an absolute guarantee, nor is it satisfied by insurance or delegation.

Question 4Legislative and regulatory requirements, duty of care, and licensing obligations

A crane operator's high risk work licence is due to expire next month. What is the operator's obligation regarding the licence?

  1. Continue operating and renew after the expiry date passes
  2. Apply for renewal before the expiry date to keep the licence valid Correct answer.
  3. Ask a licensed colleague to sign the daily inspection records
  4. Notify the crane manufacturer of the expiry date

Explanation

A high risk work licence must be renewed before it expires to remain valid. Operating after expiry means working without a licence, which breaches WHS requirements. The licence holder is responsible for managing the renewal, and the regulator usually allows a renewal application period before expiry.

Question 5Legislative and regulatory requirements, duty of care, and licensing obligations

Who is responsible for ensuring that a non-slewing mobile crane has a current inspection and maintenance program in place on a construction site?

  1. The person conducting the business or undertaking Correct answer.
  2. The crane operator alone
  3. The site first aid officer
  4. The crane hire insurer

Explanation

The PCBU has the primary duty to ensure plant is maintained and inspected so it is safe to use. While the operator performs pre-start checks, the overall maintenance program is an organisational responsibility. Other roles such as first aid officers or insurers do not hold this duty.

Question 6Legislative and regulatory requirements, duty of care, and licensing obligations

Which document would a regulator typically issue to require a PCBU to produce records relating to high risk work licensing?

  1. A notice of improvement or a notice of non-compliance Correct answer.
  2. A crane load chart
  3. A tax invoice
  4. A site induction certificate

Explanation

Regulators can issue notices, such as improvement notices or prohibition notices, requiring compliance with WHS laws, including licensing records. A tax invoice, induction certificate or load chart are operational or commercial documents. They do not have regulatory enforcement power.

Question 7Legislative and regulatory requirements, duty of care, and licensing obligations

An operator holds a CN licence but is asked to operate a slewing mobile crane. What is the correct response?

  1. Operate it after completing a site induction
  2. Operate it because both are mobile cranes
  3. Decline because the CN class does not cover slewing cranes Correct answer.
  4. Operate it only if supervised by a licensed operator

Explanation

High risk work licences are class-specific, and the CN class covers non-slewing mobile cranes only. Operating a slewing crane requires the appropriate slewing mobile crane licence class. Supervision or a site induction does not extend the scope of a licence.

Question 8Legislative and regulatory requirements, duty of care, and licensing obligations

A worker's CN licence has been suspended by the regulator following a safety incident. What is the worker's position regarding crane operation?

  1. They may continue operating until the suspension is reviewed
  2. They must not operate a non-slewing mobile crane while suspended Correct answer.
  3. They may operate if the site supervisor gives written approval
  4. They may operate only on sites where the regulator is not present

Explanation

A suspended licence has no effect, so the holder must not perform the licensed work during the suspension period. Site-level approvals cannot override a regulatory suspension. Continuing to operate would breach WHS licensing requirements and could attract penalties.

Question 9Legislative and regulatory requirements, duty of care, and licensing obligations

A crane operator notices that the outrigger pads are missing and the ground is soft. Under the hierarchy of control, which action best reflects the duty of care?

  1. Proceed slowly and rely on the crane's stability system
  2. Ask a nearby worker to watch the outriggers
  3. Complete the lift and report the issue at the end of the shift
  4. Stop the task and have the hazard controlled before operating Correct answer.

Explanation

Workers must not carry out tasks where there is a risk to health and safety, and hazards should be controlled before work proceeds. Stopping and controlling the hazard reflects the duty to eliminate or minimise risk. Relying on the crane's systems or observers does not remove the underlying risk.

Question 10Legislative and regulatory requirements, duty of care, and licensing obligations

Which of the following best describes the concept of 'reasonably practicable' in WHS law?

  1. Doing whatever the manufacturer recommends without further assessment
  2. Following the same controls used on every other site
  3. Acting only when a regulator has issued a direction
  4. Weighing the likelihood and severity of harm against the cost and availability of controls Correct answer.

Explanation

Reasonably practicable involves balancing the likelihood and degree of harm against what is known about the hazard, the availability and suitability of controls, and their cost. It is a proportionate test, not a fixed checklist. It requires judgement about the specific circumstances rather than copying other sites or waiting for directions.

Question 11Legislative and regulatory requirements, duty of care, and licensing obligations

A PCBU engages a labour hire worker to operate a non-slewing mobile crane. Who must verify that the worker holds a current CN licence?

  1. Both the labour hire company and the host employer Correct answer.
  2. Only the host employer
  3. Neither party, because the worker is self-certified
  4. Only the labour hire company

Explanation

Both the labour hire provider and the host employer are PCBUs with duties relating to the work, and each must ensure licensed work is done by a licensed person. Duties can overlap and are not transferred by the labour hire arrangement. Relying on the other party alone does not discharge either duty.

Question 12Legislative and regulatory requirements, duty of care, and licensing obligations

What is the main purpose of the general construction induction card (white card) in relation to crane operations?

  1. It certifies the holder as a crane inspector
  2. It replaces the need for a high risk work licence
  3. It provides evidence of basic construction safety induction Correct answer.
  4. It authorises the holder to operate any crane on site

Explanation

The general construction induction card evidences completion of basic construction safety induction and is required to work on construction sites. It is not a high risk work licence and does not authorise crane operation. The CN licence is a separate, class-specific requirement.

Question 13Legislative and regulatory requirements, duty of care, and licensing obligations

An operator is directed by a supervisor to lift a load that exceeds the crane's rated capacity. What should the operator do?

  1. Perform the lift with a spotter in position
  2. Perform the lift at reduced speed
  3. Refuse the lift and explain the capacity limit Correct answer.
  4. Perform the lift and log it as a trial lift

Explanation

Workers have a duty to refuse work that creates an unacceptable risk, and operating beyond rated capacity is unsafe and unlawful. The operator should stop and explain the limit. Speed reduction, spotters or labelling it a trial do not make an overload lift safe.

Question 14Legislative and regulatory requirements, duty of care, and licensing obligations

Which statement correctly describes the worker's duty under WHS legislation?

  1. Workers must take reasonable care of their own health and safety and that of others affected by their actions Correct answer.
  2. Workers are responsible for writing the site safety management plan
  3. Workers have no legal duties and must simply follow instructions
  4. Workers must ensure the crane manufacturer complies with design standards

Explanation

Workers have a personal duty to take reasonable care for their own health and safety and for others who may be affected by their acts or omissions. They must also comply with reasonable instructions and cooperate with safety policies. They do not carry the PCBU's duties such as preparing the safety management plan.

Question 15Legislative and regulatory requirements, duty of care, and licensing obligations

A regulator's inspector arrives on site and asks to see the crane operator's licence. What is the operator's obligation?

  1. Refer the inspector to the crane owner
  2. Refuse until a lawyer is present
  3. Provide the licence as requested and cooperate with the inspection Correct answer.
  4. Provide a photocopy and remove the original from site

Explanation

Inspectors have powers to require production of documents and to inspect workplaces, and duty holders must cooperate. The operator should produce the licence and answer questions truthfully. Refusing or deflecting to another party can constitute an offence.

Question 16Legislative and regulatory requirements, duty of care, and licensing obligations

What does holding a CN licence signify about the holder's legal authority?

  1. They are automatically qualified as a dogger
  2. They may operate any plant on site with supervision
  3. They may train other operators without further qualification
  4. They are assessed as competent to operate non-slewing mobile cranes above three tonnes Correct answer.

Explanation

A high risk work licence is issued after assessment against the national competency standard for that class. For CN, it authorises operation of non-slewing mobile cranes with a capacity greater than three tonnes. It does not confer dogging, training or general plant operation rights.

Question 17Legislative and regulatory requirements, duty of care, and licensing obligations

A crane operator has been off work for two years and their CN licence is still current. What is required before resuming crane operation?

  1. Only a renewal of the general induction card
  2. Nothing, because the licence remains valid
  3. A new licence application
  4. Relevant familiarisation and verification of current competence with the crane and site Correct answer.

Explanation

A current licence confirms the class, but employers must ensure the operator is familiar with the specific crane and site conditions and remains competent. Refresher training or familiarisation may be needed after a long break. A valid licence alone does not guarantee current practical competence.

Question 18Legislative and regulatory requirements, duty of care, and licensing obligations

A principal contractor on a construction site subcontracts crane work to a company. Which statement about the duty of care is correct?

  1. The principal contractor's duty is entirely transferred to the subcontractor
  2. The principal contractor only needs to check the subcontractor's insurance
  3. The principal contractor has no duty once a contract is signed
  4. The principal contractor retains a duty to ensure the work is carried out safely Correct answer.

Explanation

Duties under WHS law cannot be contracted away, and a principal contractor retains duties in relation to the site and the work. Multiple duty holders may share overlapping obligations. Insurance checks or contracts do not extinguish those duties.

Question 19Legislative and regulatory requirements, duty of care, and licensing obligations

An operator's CN licence was obtained in another jurisdiction. What is generally required for the licence to be recognised in the new jurisdiction?

  1. The licence must be recognised under the relevant national or mutual recognition arrangements Correct answer.
  2. The operator must sit a full new assessment in every case
  3. Nothing, because all licences are automatically valid everywhere
  4. The operator must obtain a letter from the crane manufacturer

Explanation

High risk work licences are issued under nationally consistent arrangements, and mutual recognition provisions allow licences from other jurisdictions to be recognised. In some cases the holder must notify the local regulator or obtain a corresponding local licence. A full reassessment is not automatically required.

Question 20Legislative and regulatory requirements, duty of care, and licensing obligations

During a lift, an operator observes a hazard that the supervisor dismissed. The operator continues and an incident occurs. How does the law generally treat the operator's position?

  1. The crane hire company bears sole responsibility
  2. The operator bears no responsibility because a supervisor gave instructions
  3. Only the supervisor can be held responsible
  4. The operator may share responsibility because workers must take reasonable care and can refuse unsafe work Correct answer.

Explanation

Workers have a personal duty to take reasonable care and should not carry out unsafe work even when instructed. Following an unsafe direction does not automatically remove responsibility. Multiple parties, including supervisors and PCBUs, may also be held accountable.

Question 21Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

Before a non-slewing mobile crane lifts a load near an overhead powerline, which control measure should be applied first?

  1. Instruct the operator to move quickly through the danger zone
  2. Fit insulating sleeves to the crane's hook block
  3. Arrange de-energising and isolation of the line with the network operator Correct answer.
  4. Post a spotter to watch the load and warn the operator

Explanation

The hierarchy of control requires eliminating the hazard before relying on administrative or personal measures. De-energising and isolating the line with the network operator removes the electrical risk entirely. Spotting and insulating devices are lower-order controls used only when isolation is not practicable.

Question 22Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

What is the main reason a non-slewing mobile crane is more prone to tipping than a slewing crane of similar capacity?

  1. Its tyres are always inflated to a lower pressure
  2. It has no outriggers fitted at any time
  3. It cannot swing the load, so it must reposition the whole machine to place loads Correct answer.
  4. Its boom cannot be luffed or telescoped

Explanation

Because the boom cannot slew independently, the operator must move or reposition the carrier to swing a load, which shifts the machine's centre of gravity and changes the load radius. Stability therefore depends heavily on ground conditions and configuration at each position.

Question 23Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

A crane's load chart shows a capacity of 4.0 tonnes at 6 metres radius with outriggers fully extended. What must the operator do before lifting a 3.8 tonne load at that radius?

  1. Add the hook block mass to the chart capacity
  2. Verify the actual radius, ground bearing and configuration against the chart Correct answer.
  3. Proceed because the load is under the charted capacity
  4. Reduce the radius by booming out further

Explanation

Charted capacity applies only when the actual configuration, radius and ground conditions match the chart's assumptions. The operator must confirm the real radius, that outriggers are fully extended and that the ground can carry the loads. A load close to capacity leaves little margin for error.

Question 24Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

Which ground condition most seriously reduces the stability of a non-slewing mobile crane using outriggers?

  1. Concrete hardstand with visible expansion joints
  2. Compacted gravel over a buried service trench Correct answer.
  3. Dry sand that has been watered and rolled
  4. Firm clay that has been recently graded

Explanation

A buried trench creates a void that can collapse under an outrigger, causing sudden loss of support and tipping. The surface appearance may be firm while the subsurface is weak. Ground bearing must be assessed for what lies beneath, not just the visible material.

Question 25Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

During a lift, the operator notices the crane beginning to tip slowly toward the load. What is the correct immediate response?

  1. Lower the load steadily to the ground and stop the lift Correct answer.
  2. Continue the lift to place the load quickly
  3. Increase engine speed to complete the motion faster
  4. Raise the boom to move the load closer

Explanation

Slow tipping indicates the machine is at or beyond its stability limit. Lowering the load reduces the overturning moment and restores stability, after which the lift must be stopped and the cause investigated. Continuing or accelerating the motion increases the risk of a full tip-over.

Question 26Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

Why must the mass of slings, spreader beams and the hook block be included when calculating a lift?

  1. They are excluded from the load chart's rated capacity
  2. They reduce the effective boom length
  3. They affect only the height of the lift
  4. They form part of the total load that the crane must support Correct answer.

Explanation

Rated capacities are based on the total suspended mass, which includes the load plus all rigging and lifting attachments below the boom point. Omitting rigging mass can push the actual load beyond the charted capacity. The gross load must always be compared with the chart.

Question 27Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

A crane is working on a site where pedestrians use an adjacent walkway. Which control best protects them from the crane's hazard zone?

  1. Physically barricade the hazard zone and provide a separate pedestrian route Correct answer.
  2. Rely on the crane's audible reversing alarm
  3. Ask pedestrians to make eye contact with the operator
  4. Place a sign at the site entrance warning of crane operations

Explanation

Physical separation is a higher-order control that removes pedestrians from the danger area entirely. Signs, alarms and eye contact are administrative or warning measures that depend on people noticing and complying. A dedicated alternative route keeps people out of the hazard zone.

Question 28Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

What is the primary purpose of a lift study or lift plan for a complex non-slewing mobile crane lift?

  1. To calculate the crane's fuel consumption for the shift
  2. To satisfy insurance requirements only
  3. To record the operator's licence number on site
  4. To document the hazard assessment, crane configuration and controls before work starts Correct answer.

Explanation

A lift plan records the identified hazards, the selected crane and configuration, ground assessment, rigging and control measures. It provides a basis for briefing the crew and verifying the lift is within capacity. Its purpose is safety planning, not administration alone.

Question 29Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

An operator is asked to lift a load whose mass is unknown and cannot be verified. What is the appropriate action?

  1. Assume the mass is half the charted capacity
  2. Do not lift until the mass is determined and the lift is verified against the chart Correct answer.
  3. Lift the load slowly and judge the mass by feel
  4. Lift only to a height of one metre to test it

Explanation

Without a known mass, the operator cannot confirm the lift is within the crane's rated capacity. The load must be weighed or its mass established from documentation before lifting. Estimating by feel or assuming a value is unsafe.

Question 30Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

Which factor most directly increases the load radius of a non-slewing mobile crane?

  1. Increasing the counterweight mass
  2. Lowering the outrigger pads onto timber spreaders
  3. Positioning the crane further from the load's landing point Correct answer.
  4. Shortening the boom by retracting it

Explanation

Load radius is the horizontal distance from the crane's rotation centre to the load's centre of gravity. Moving the crane further from the landing point increases that distance. Greater radius reduces the crane's capacity.

Question 31Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

A crane is set up on a slope. Which consequence is most relevant to safe operation?

  1. The tyres will wear unevenly over time
  2. The crane's paint may be damaged by drainage
  3. The load chart may no longer apply because the crane is not level Correct answer.
  4. The boom will automatically retract

Explanation

Load charts assume the crane is set up level within the manufacturer's tolerance. Operating on a slope changes the geometry and can reduce stability and capacity. The crane must be levelled or the manufacturer's slope limits observed.

Question 32Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

What is the key hazard of lifting a load with a large surface area in windy conditions?

  1. The rigging will automatically detension
  2. The load becomes lighter and can be lifted faster
  3. The wind can increase the effective load and swing the load out of control Correct answer.
  4. The crane's engine will overheat

Explanation

Wind acting on a large sail area creates forces that add to the load on the crane and can cause the load to swing or rotate. Both effects can overload the crane or strike people and structures. Manufacturer wind limits must be observed.

Question 33Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

Which communication method should be used between the dogger and the crane operator when the load is out of the operator's view?

  1. A agreed system of hand signals or two-way radio with a designated signaller Correct answer.
  2. Relying on the operator to judge the load's position
  3. Shouting instructions from the landing point
  4. Using the crane's horn to indicate movements

Explanation

Where the operator cannot see the load, a designated signaller must relay instructions using agreed hand signals or radio. This ensures movements are controlled and understood. Shouting or guessing is unreliable and dangerous.

Question 34Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

An outrigger pad is placed on a timber sleeper that is too small for the load. What is the likely result?

  1. The sleeper will strengthen the ground beneath
  2. The outrigger may penetrate the ground and cause the crane to tip Correct answer.
  3. The crane's capacity will increase
  4. The outrigger will automatically retract

Explanation

Outrigger pads spread the load over a larger area to keep ground pressure within the soil's bearing capacity. An undersized pad concentrates the force and can cause penetration or collapse. Loss of support at one outrigger can tip the crane.

Question 35Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

Which of the following best describes the hazard zone that must be established around a non-slewing mobile crane during a lift?

  1. The area occupied by the crane's cabin only
  2. The area where the load, boom or crane could strike or crush a person Correct answer.
  3. The area behind the crane's exhaust outlet
  4. The area within one metre of the outriggers

Explanation

The hazard zone must cover every area the crane, boom, load and rigging could reach, including the swing path and any area where a load could fall. People must be excluded from this zone unless their role requires them to be there.

Question 36Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

A load is rigged with a sling angle that is much flatter than planned. How does this affect the lift?

  1. The load's mass decreases
  2. Sling tension decreases and the lift becomes safer
  3. Sling tension and the load on the crane increase Correct answer.
  4. The crane's capacity increases

Explanation

As the angle between sling legs becomes flatter, the tension in each leg rises sharply for the same load. This increases the load on the rigging and the crane. Sling angles must be planned and checked against the rigging's rated capacity.

Question 37Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

What should an operator do if a crane's safety devices, such as the rated capacity limiter, are malfunctioning?

  1. Continue working if the load is judged to be light
  2. Operate at reduced speed to compensate
  3. Disconnect the device to avoid nuisance alarms
  4. Stop operating the crane until the fault is repaired and verified Correct answer.

Explanation

Safety devices such as rated capacity limiters are critical controls that warn of or prevent overload. A malfunctioning device removes that protection, so the crane must be taken out of service until repaired. Operating without it is unsafe regardless of the load.

Question 38Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

Which of the following is an example of a dynamic load effect that must be considered during a lift?

  1. The static mass of the load shown on a delivery docket
  2. Sudden deceleration causing the load to swing and increase rope tension Correct answer.
  3. The colour coding of the slings
  4. The crane's hourly fuel use

Explanation

Dynamic effects occur when a load is accelerated or decelerated, causing forces greater than the static weight. Sudden stops can cause the load to swing and increase tension in the rope and rigging. Operators must move loads smoothly to limit these forces.

Question 39Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

A non-slewing mobile crane must travel with a suspended load. What is the most important condition to check before doing so?

  1. The load is tied to the boom with rope
  2. The manufacturer's instructions permit travel with a load in that configuration Correct answer.
  3. The load is below half the charted capacity
  4. The operator has driven the route before

Explanation

Travelling with a suspended load is only permitted where the manufacturer's instructions and the load chart allow it. The configuration, ground and route must all be assessed. Some cranes are not rated for load travel, so the manual must be consulted.

Question 40Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

How should the risk of a crane contacting an overhead powerline be assessed if the line cannot be de-energised?

  1. Determine the line voltage and apply the required exclusion distance plus a spotter Correct answer.
  2. Lower the boom and drive under the line quickly
  3. Rely on the operator's judgement of distance
  4. Assume contact is safe if the tyres are rubber

Explanation

Where isolation is not possible, the line voltage determines the safe approach distance required by the network operator and regulations. A dedicated spotter and physical barriers help keep the crane clear. Rubber tyres do not protect against high-voltage contact.

Question 41Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

A crane is lifting a load from a truck when the truck begins to move. What is the most likely consequence?

  1. The load's mass will decrease
  2. The load may swing and the crane may be subjected to unexpected dynamic forces Correct answer.
  3. The crane's outriggers will retract
  4. The slings will automatically release

Explanation

If the truck moves while the load is still attached or partially supported, the load can swing or snatch. This creates dynamic forces that may exceed the crane's capacity or cause loss of control. The truck must be secured and the load fully clear before lifting.

Question 42Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

What is the purpose of a pre-start check on a non-slewing mobile crane?

  1. To identify defects that could affect safe operation before the crane is used Correct answer.
  2. To calculate the load chart for the day
  3. To record the crane's hours for billing purposes
  4. To confirm the operator's shift roster

Explanation

A pre-start check inspects critical items such as tyres, outriggers, ropes, brakes and safety devices for defects. Defects must be reported and rectified before use. It is a safety control, not an administrative or billing task.

Question 43Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

During a lift, a worker needs to guide the load by hand. What is the safest approach?

  1. Ask the worker to push the load while it is moving
  2. Have the worker hold the sling during the lift
  3. Have the worker stand directly under the load to steady it
  4. Use a tag line so the worker can guide the load from outside the crush zone Correct answer.

Explanation

Tag lines allow a worker to control load rotation from a distance, keeping them outside the hazard zone. Standing under or touching a suspended load exposes the worker to crushing if the load moves or falls. Hands and bodies should be kept clear of the load and rigging.

Question 44Hazard identification, risk assessment, and control measures for non-slewing mobile crane operations

Which combination best demonstrates that a lift has been adequately risk assessed?

  1. A toolbox talk held at the start of the month
  2. A generic site induction completed by all workers
  3. A signed SWMS kept in the site office without briefing
  4. Hazards identified, controls selected by the hierarchy of control, and the plan communicated to the crew Correct answer.

Explanation

Effective risk assessment identifies the specific hazards of the lift and selects controls in order of effectiveness, starting with elimination. The resulting plan must be communicated to everyone involved so controls are understood and applied. Paperwork alone does not control risk.

Question 45Crane types, configurations, capacities, and load charts

On a non-slewing mobile crane, which component is primarily responsible for changing the boom's operating radius?

  1. The slewing ring and pinion
  2. The hoist drum brake
  3. The outrigger beams
  4. The luffing cylinder or luffing rope system Correct answer.

Explanation

A non-slewing crane cannot rotate its upper structure, so radius is changed by raising or lowering the boom. This luffing action is performed by hydraulic cylinders or a rope-and-pulley luffing system depending on the crane design. Changing boom angle directly alters the horizontal distance from the crane's rotation centre to the hook.

Question 46Crane types, configurations, capacities, and load charts

What does the rated capacity of a mobile crane represent at any given configuration?

  1. The load that causes the crane to reach its tipping point exactly
  2. The weight of the load plus the hook block only
  3. The load the crane can lift with a structural or stability margin built into the chart Correct answer.
  4. The maximum load the crane can lift with the boom at its highest angle

Explanation

Rated capacities published in load charts already include deductions and safety margins for structural strength and stability. The figure is the maximum allowable load for the specified radius, boom length and configuration. Exceeding it removes that margin and risks structural failure or tipping.

Question 47Crane types, configurations, capacities, and load charts

Which information must be known before a load chart can be used correctly?

  1. The load's centre of gravity alone
  2. The time of day and wind direction only
  3. The radius, boom length and configuration being operated Correct answer.
  4. The colour of the crane and the operator's experience level

Explanation

A load chart is organised by radius, boom length and configuration such as outrigger spread or counterweight. Without these values the chart cannot be read accurately. Other factors like wind and load shape affect the lift but do not select the chart row.

Question 48Crane types, configurations, capacities, and load charts

When reading a load chart, what is the working radius measured from?

  1. The centre of rotation of the crane to the centre of the hook Correct answer.
  2. The boom foot pin to the boom tip
  3. The outrigger pad to the hook
  4. The rear of the crane chassis to the load

Explanation

Working radius is the horizontal distance from the crane's centre of rotation to the vertical line through the hook. It is measured with the boom in the position it will be during the lift. This distance determines which capacity entry applies.

Question 49Crane types, configurations, capacities, and load charts

A crane's load chart shows a capacity for 'on outriggers, fully extended'. What must the operator ensure before using that rating?

  1. The outriggers are retracted and the crane is on rubber
  2. The outriggers are partially extended to save space
  3. Only the front outriggers are deployed
  4. The outriggers are fully extended and the crane is level on firm ground Correct answer.

Explanation

Chart ratings are configuration-specific; the stated rating applies only when the crane matches that configuration. Fully extended outriggers on a level, firm surface provide the stability assumed by the chart. Using a lesser setup invalidates the rating and may cause tipping.

Question 50Crane types, configurations, capacities, and load charts

What happens to the rated capacity of a mobile crane as the working radius increases, with boom length unchanged?

  1. Rated capacity increases
  2. Rated capacity is unaffected by radius
  3. Rated capacity decreases Correct answer.
  4. Rated capacity stays the same

Explanation

Increasing radius increases the overturning moment created by the load about the crane's tipping axis. To keep stability within safe limits, the chart's allowable load must reduce. This is why capacity figures fall as the boom is luffed down.