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CSCS Mobile Tower study materials
CSCS Mobile Tower study resources

CSCS Mobile Tower practice questions

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Question 1Site safety and risk assessment for tower operations

When planning a mobile tower operation, what is the primary purpose of a site-specific risk assessment?

  1. To list the names of operatives who hold harnesses
  2. To record the hire charges for the tower equipment
  3. To confirm the manufacturer's delivery schedule
  4. To identify hazards and control measures before work begins Correct answer.

Explanation

A site-specific risk assessment identifies the hazards present at the location and the control measures needed to reduce risk to an acceptable level before work starts. It is a planning document, not a commercial or personnel record.

Question 2Site safety and risk assessment for tower operations

What is the standard hierarchy of control used when deciding how to manage risks from tower work?

  1. Eliminate, reduce, isolate, control, protect Correct answer.
  2. Plan, do, check, act, report
  3. Assess, permit, monitor, review, record
  4. Identify, notify, inspect, sign off, archive

Explanation

The hierarchy of control starts with eliminating the hazard, then reducing exposure, isolating people from it, applying administrative controls, and finally providing personal protective equipment. PPE is the last line of defence, not the first choice.

Question 3Site safety and risk assessment for tower operations

A mobile tower must be erected close to an overhead power line. Which control should be considered first?

  1. Erect the tower at night when the line is switched off
  2. Erect the tower in a different location clear of the line Correct answer.
  3. Use a wooden platform to insulate the operatives
  4. Ask operatives to keep their heads below the platform

Explanation

The hierarchy of control requires eliminating the hazard where reasonably practicable, so relocating the tower clear of the line is the preferred first step. Only if relocation is not possible should isolation, goalposts or barriers be used.

Question 4Site safety and risk assessment for tower operations

What is the main purpose of a permit-to-work system for tower operations on a live site?

  1. To replace the need for any site induction
  2. To transfer legal duties from the employer to the operative
  3. To provide a permanent record of equipment ownership
  4. To formally authorise specific high-risk work under defined controls Correct answer.

Explanation

A permit-to-work formally authorises a defined high-risk task, records the controls in place, and confirms the area is safe at the time of issue. It supplements but never replaces induction, training or legal duties.

Question 5Site safety and risk assessment for tower operations

Before erecting a mobile tower, which ground condition most directly requires the assessment to specify spreader plates or pads?

  1. Soft or uneven ground that could allow leg settlement Correct answer.
  2. A smooth concrete slab with good drainage
  3. Grass that has been recently mown
  4. A slight camber on a tarmac car park

Explanation

Soft or uneven ground can allow tower legs to settle or sink, causing the structure to become unstable, so load-spreading plates or pads are needed. Firm, level surfaces generally require only standard base plates.

Question 6Site safety and risk assessment for tower operations

On a site where vehicles operate near a mobile tower, what is the most effective control in the risk assessment?

  1. Ask drivers to sound their horn when approaching
  2. Instruct operatives to wear high-visibility clothing
  3. Place a single cone at each corner of the tower
  4. Physically separate vehicle routes from the tower with barriers Correct answer.

Explanation

Physically separating pedestrians and the tower from vehicle movements is an engineering control that removes the chance of collision. Warning devices, cones and hi-vis clothing rely on human behaviour and are lower-order controls.

Question 7Site safety and risk assessment for tower operations

Which weather condition should trigger a reassessment of tower stability before work continues?

  1. A clear sky with a falling temperature
  2. Light drizzle with no measurable wind
  3. Sustained strong winds approaching the manufacturer's limit Correct answer.
  4. Intermittent sunshine between clouds

Explanation

Mobile towers are particularly vulnerable to wind loading, and manufacturers specify maximum wind speeds for erection and use. Work should stop and the tower be stabilised or dismantled when winds approach those limits.

Question 8Site safety and risk assessment for tower operations

What does the risk assessment need to state about the maximum height to which a mobile tower may be erected?

  1. The height of the tallest nearby building
  2. The height permitted by the site's insurance policy alone
  3. The height that operatives feel comfortable working at
  4. The height limits set by the manufacturer for that configuration Correct answer.

Explanation

Mobile towers have manufacturer-specified height-to-base ratios and outrigger requirements that must not be exceeded. The assessment should record these limits and the configuration that will be used.

Question 9Site safety and risk assessment for tower operations

Why should the risk assessment identify an exclusion zone around the base of a mobile tower?

  1. To mark where the site office will be sited
  2. To keep people clear of the area where the tower could collapse or objects could fall Correct answer.
  3. To provide a storage area for spare components
  4. To reserve parking space for the delivery vehicle

Explanation

An exclusion zone prevents people from being struck by falling objects or being in the collapse footprint of the tower during erection, use and dismantling. It should be physically marked and enforced.

Question 10Site safety and risk assessment for tower operations

During erection of a mobile tower, when should the assessment require operatives to be tied off or otherwise protected against falls?

  1. Only when an inspector is on site
  2. Only when the weather is wet or windy
  3. Whenever work is carried out at height where a fall could cause injury Correct answer.
  4. Only once the platform exceeds ten metres

Explanation

Fall protection is required for any work at height from which a person could fall a distance liable to cause injury, not only above an arbitrary height. The assessment should identify when harnesses, guardrails or a safer method are needed.

Question 11Site safety and risk assessment for tower operations

What is the correct action if the risk assessment identifies that the tower cannot be erected safely at the planned location?

  1. Continue and note the issue in the handover file
  2. Erect the tower and address problems as they arise
  3. Stop and revise the plan before any erection begins Correct answer.
  4. Proceed if operatives agree to accept the risk

Explanation

If the planned work cannot be done safely, the work must not start; the method, location or equipment must be changed. Proceeding and fixing problems later exposes operatives to uncontrolled risk.

Question 12Site safety and risk assessment for tower operations

Which document should the risk assessment reference to confirm the correct assembly sequence for a particular mobile tower?

  1. The operative's training certificate
  2. The site's general health and safety policy
  3. The delivery note from the hire company
  4. The manufacturer's instruction manual for that tower Correct answer.

Explanation

The manufacturer's instructions give the validated assembly sequence, bracing requirements and stabiliser configuration for that specific tower. The risk assessment should reference and follow them.

Question 13Site safety and risk assessment for tower operations

A lone operative is asked to erect a mobile tower at the far end of a large site. What is the key concern for the risk assessment?

  1. The cost of transporting the tower to that location
  2. Lack of assistance and emergency response in the event of a fall or collapse Correct answer.
  3. The colour of the tower's guardrails
  4. Whether the operative has a valid driving licence

Explanation

Lone working at height removes the immediate help needed if someone falls, is trapped or the tower becomes unstable. The assessment should require a second person or another means of raising the alarm.

Question 14Site safety and risk assessment for tower operations

What should the risk assessment specify about access to a mobile tower platform?

  1. Climbing the outside of the tower frame
  2. Standing on an adjacent drum or pallet
  3. Using a freestanding ladder leaned against the tower
  4. Internal ladders or stairs fitted in accordance with the manufacturer's design Correct answer.

Explanation

Access must be through the manufacturer's designed internal ladder or stairway so that operatives have three points of contact and the tower is not destabilised. Improvised access is a common cause of falls and collapse.

Question 15Site safety and risk assessment for tower operations

When should the risk assessment be reviewed during a long tower project?

  1. Only when a new operative joins the company
  2. Whenever there is a change in conditions, personnel or method Correct answer.
  3. Only after an accident has occurred
  4. Only at the end of the project

Explanation

Risk assessments are living documents and must be reviewed when circumstances change, such as new hazards, different equipment or revised methods. Waiting for an incident means controls may already have failed.

Question 16Site safety and risk assessment for tower operations

What is the purpose of recording residual risk in the tower risk assessment?

  1. To list the risks that have been completely removed
  2. To identify which operatives are to blame for hazards
  3. To document the cost of the control measures
  4. To show the risk that remains after controls and confirm it is acceptable Correct answer.

Explanation

Residual risk is what remains once controls are applied; recording it demonstrates that the remaining risk has been judged tolerable. It is not a record of eliminated hazards or of blame.

Question 17Site safety and risk assessment for tower operations

Which of these is the best example of an engineering control for a mobile tower task?

  1. Requiring operatives to sign a safety pledge
  2. Issuing a written method statement
  3. Briefing operatives on the risks at the morning meeting
  4. Fitting stabilisers and outriggers to increase the base footprint Correct answer.

Explanation

Stabilisers and outriggers physically change the structure to resist overturning, making them an engineering control. Briefings, method statements and pledges are administrative controls that rely on behaviour.

Question 18Site safety and risk assessment for tower operations

What should the risk assessment state about the maximum number of persons and the maximum load permitted on a tower platform?

  1. The number that fits when standing shoulder to shoulder
  2. The number the operatives think is reasonable
  3. The figures stated by the manufacturer for that platform Correct answer.
  4. The number agreed with the hire company by phone

Explanation

Platform load and occupancy limits are design parameters set by the manufacturer and must not be exceeded. Overloading can cause collapse or overturning.

Question 19Site safety and risk assessment for tower operations

A tower is to be used near a public footpath. What control should the risk assessment prioritise?

  1. Fencing or hoarding to prevent public access to the work area Correct answer.
  2. Placing a warning sign at the site entrance only
  3. Asking the public to walk around the tower
  4. Erecting the tower during the quietest part of the day

Explanation

Members of the public cannot be relied upon to avoid hazards, so physical barriers are needed to keep them out of the work area and fall zone. Signs and timing alone are insufficient.

Question 20Site safety and risk assessment for tower operations

Why does the risk assessment need to consider the competence of the persons erecting the tower?

  1. Competence is only needed for towers above five metres
  2. Competence only matters for insurance purposes
  3. Competence is relevant only when using power tools
  4. Tower erection requires trained and competent persons to follow the correct sequence safely Correct answer.

Explanation

Mobile tower erection involves specific sequences, bracing and stabilising steps that must be followed; only trained, competent people can do this safely. Competence is a core control, not an administrative nicety.

Question 21Site safety and risk assessment for tower operations

What should the risk assessment require before a mobile tower is moved to a new position on site?

  1. The tower is left in place and a new one is hired
  2. The tower is dismantled or reduced and the new location is assessed Correct answer.
  3. The tower is towed by a vehicle with operatives on the base
  4. The tower is pushed slowly while operatives remain on the platform

Explanation

Mobile towers must not be moved with people or materials on the platform; they should be dismantled or reduced to a safe configuration and the new position assessed for ground and overhead hazards. Moving with people on board risks collapse.

Question 22Site safety and risk assessment for tower operations

The risk assessment identifies that materials will be lifted onto the tower platform. What is the key control to specify?

  1. Carrying materials up the outside frame
  2. A safe method of raising materials that avoids overloading and manual handling injury Correct answer.
  3. Throwing materials up to the platform
  4. Passing materials up hand to hand from ground level

Explanation

Materials must be raised by a method that respects platform load limits and avoids manual handling injury, such as a hoist or rope-and-bucket system. Improvised methods create both handling and stability risks.

Question 23Site safety and risk assessment for tower operations

What does an emergency plan for tower operations need to include?

  1. Rescue arrangements for a fallen operative and how to raise the alarm Correct answer.
  2. The names of the client's board of directors
  3. The site's holiday rota for the coming year
  4. The specification for the tower's paint finish

Explanation

The emergency plan must cover how to raise the alarm and how a casualty at height will be rescued without exposing rescuers to further risk. Suspension in a harness can quickly become life-threatening.

Question 24Site safety and risk assessment for tower operations

A risk assessment shows that a tower will be used in an area with deep excavations nearby. What is the main concern to address?

  1. Ground collapse or instability undermining the tower's foundations Correct answer.
  2. The colour of the excavation warning tape
  3. The cost of backfilling the excavation
  4. The depth of the excavation for billing purposes

Explanation

Excavations can reduce the bearing capacity or stability of adjacent ground, so the tower must be sited far enough away or the excavation supported. Undermined foundations can cause sudden collapse.

Question 25Site safety and risk assessment for tower operations

What is the correct way to record the findings of a tower risk assessment for the workforce?

  1. Share it only with the client's finance team
  2. Keep the document locked away from operatives
  3. Read it aloud once at the start of the year
  4. Communicate the significant findings and controls to those affected Correct answer.

Explanation

The significant findings and the controls to be followed must be communicated to everyone affected by the work. A document that operatives never see cannot influence their behaviour or safety.

Question 26Site safety and risk assessment for tower operations

In a tower risk assessment, which factor most directly determines whether a particular ground surface can support a mobile tower?

  1. The number of operatives on site that day
  2. The colour of the tower's base plates
  3. The ground's load-bearing capacity and levelness Correct answer.
  4. The distance to the site office

Explanation

A mobile tower transmits its weight and wind loads through its feet into the ground, so the assessment must confirm the surface can carry those loads and is level enough to keep the tower plumb. Surface appearance alone does not establish capacity.

Question 27Site safety and risk assessment for tower operations

A risk assessment for a mobile tower must consider wind loading. Which statement best reflects the underlying principle?

  1. Wind force on a tower increases with the sail area of the platform and any sheeting Correct answer.
  2. Wind effects are fully eliminated by fitting castors
  3. Wind only matters when the tower exceeds ten metres in height
  4. Wind loading is the same regardless of tower height

Explanation

Wind acts on the exposed area of the tower, including any sheeting or materials, and the resulting force grows with both that area and the height of the structure. The assessment must therefore consider expected wind conditions and the manufacturer's limits.

Question 28Site safety and risk assessment for tower operations

What is the primary purpose of a site-specific risk assessment for a mobile tower task?

  1. To replace the need for operative training
  2. To satisfy an insurance requirement only
  3. To identify hazards and set out controls before work starts Correct answer.
  4. To record the tower's purchase price

Explanation

A risk assessment is a structured process to identify significant hazards, evaluate the risk and specify controls that reduce it to an acceptable level. It supports safe planning rather than substituting for competence or insurance.

Question 29Site safety and risk assessment for tower operations

A tower is to be used on a site where the public can approach the perimeter fence. Which control should the risk assessment prioritise?

  1. Removing the fence to improve visibility
  2. Restricting tower use to daylight hours only
  3. Requiring operatives to work faster to reduce exposure time
  4. Preventing objects and the tower itself from endangering people outside the boundary Correct answer.

Explanation

Where the public are adjacent, the assessment must control the risk of falling objects and of any tower collapse or movement affecting people beyond the site boundary. Physical measures such as netting, toe boards and set-back distances are typical controls.

Question 30Site safety and risk assessment for tower operations

During the planning stage, the risk assessment identifies that a mobile tower will be used on soft ground after rain. What is the most appropriate control to specify?

  1. Provide spreader pads or a prepared hard standing under the feet Correct answer.
  2. Move the tower every hour to spread the load
  3. Reduce the number of braces to save time
  4. Instruct operatives to work only on the sunny side of the tower

Explanation

Soft ground can allow the feet to sink and the tower to become unstable, so the assessment should specify load-spreading measures or a prepared base. This addresses the ground-bearing hazard directly.

Question 31Site safety and risk assessment for tower operations

A risk assessment for a tower near an overhead power line is being prepared. What is the key control principle?

  1. Use a wooden ladder to bridge the gap
  2. Maintain a safe clearance distance and isolate or divert the line where practicable Correct answer.
  3. Rely on the tower's metal frame to earth the line
  4. Erect the tower quickly to minimise exposure

Explanation

Contact or near-contact with overhead lines can cause fatal electric shock, so the assessment should specify safe clearance distances and, where possible, isolation or diversion of the line. Physical barriers and warning signs support this control.

Question 32Site safety and risk assessment for tower operations

The assessment shows that the tower will be erected close to a site boundary where a public road runs. What should the assessment require before erection begins?

  1. Removal of all warning signage to avoid alarming drivers
  2. A reduction in the tower's working platform height to one metre
  3. Erection to be carried out without supervision
  4. A check that falling objects and the tower cannot encroach onto the road Correct answer.

Explanation

The assessment must confirm that the tower and any falling materials will remain within the site and not endanger road users. This usually requires set-back distances, netting or fans and possibly a traffic management plan.

Question 33Site safety and risk assessment for tower operations

A risk assessment notes that the tower will be used to access a high-level facade. What should the assessment state about the stability of the tower in that position?

  1. That stability only needs checking after the work is finished
  2. That stabilisers are optional for facade work
  3. That the tower is designed and configured for the loads and height involved Correct answer.
  4. That stability is assured because the tower has four legs

Explanation

The assessment must confirm the tower configuration is suitable for the intended height and loads, including wind and working loads, and that stabilisers or outriggers are used as required by the manufacturer. Stability is not automatic.

Question 34Site safety and risk assessment for tower operations

The risk assessment identifies that operatives will need to climb the tower to reach the platform. What should it specify about the means of access?

  1. Standing on the platform guardrail to climb over
  2. Suitable internal ladders or stairs with a safe method of getting on and off Correct answer.
  3. Using a forklift to raise operatives to the platform
  4. Climbing the outside frame with both hands free

Explanation

Access to the platform must be by a suitable means such as internal ladders or stairs, with a safe transition onto the platform. Climbing the frame or being lifted by plant is unsafe.

Question 35Site safety and risk assessment for tower operations

A tower risk assessment must consider the competence of the people erecting it. Which statement best explains why?

  1. Untrained people can erect towers if the weather is calm
  2. Erection involves sequenced assembly and stability checks that require trained knowledge Correct answer.
  3. Competence only affects how quickly the tower is built
  4. Competence matters only for the person who signs the assessment

Explanation

Erection requires following the manufacturer's sequence, fitting braces and stabilisers correctly and checking stability at each stage. These tasks depend on trained knowledge and judgement, so competence is a key control.

Question 36Site safety and risk assessment for tower operations

A risk assessment is being reviewed after a near miss in which a tool fell from a tower platform. What is the most appropriate response?

  1. Record the near miss and take no further action
  2. Reduce the platform height and ignore the cause
  3. Review the assessment and add controls such as tool lanyards and toe boards Correct answer.
  4. Blame the operative publicly and continue work

Explanation

A near miss is evidence the existing controls are inadequate, so the assessment should be reviewed and improved. Practical controls include toe boards, tool lanyards and exclusion zones below.

Question 37Site safety and risk assessment for tower operations

The risk assessment shows the tower will be moved regularly between work positions on a sloping yard. What should it require each time the tower is relocated?

  1. That the tower is left leaning to match the slope
  2. That the tower is moved while operatives remain on the platform
  3. That the brakes are left off to allow settling
  4. A check that the new position is level and stable before the tower is re-used Correct answer.

Explanation

Each new position must be checked for levelness and ground stability before the tower is used again. Moving with people on the platform or leaving the tower unbraked is unsafe.

Question 38Site safety and risk assessment for tower operations

A risk assessment concludes that a tower will be used to carry out work over a live pedestrian route. Which combination of controls best addresses the risk?

  1. A warning sign only, with work continuing overhead
  2. A covered walkway or diversion combined with an exclusion zone under the work Correct answer.
  3. Work scheduled for lunchtime with no other measures
  4. Operatives told to be careful while working overhead

Explanation

The assessment should combine physical protection of the route with an exclusion zone to prevent people walking under the work. Signs and care alone are weaker controls and do not prevent falling objects.

Question 39Site safety and risk assessment for tower operations

A risk assessment identifies that the tower will stand adjacent to a deep excavation. What is the main concern the assessment must address?

  1. The excavation will increase the platform's load rating
  2. The excavation will change the colour of the tower
  3. The excavation will make the tower too tall
  4. The excavation may undermine the ground supporting the tower's feet Correct answer.

Explanation

An excavation close to the tower can reduce the bearing capacity of the ground and cause the feet to settle or the edge to collapse. The assessment should require adequate set-back from the excavation edge and confirmation of ground stability.

Question 40Site safety and risk assessment for tower operations

A site has several tower tasks planned over months. How should the risk assessment be managed to remain effective?

  1. Treat it as a living document, reviewed when conditions, tasks or personnel change Correct answer.
  2. Complete it once at the start and never revisit it
  3. Replace it with a verbal briefing at each shift
  4. Keep it confidential so operatives cannot read it

Explanation

Risk assessments must reflect current conditions and be reviewed whenever the work, environment or people change, or after incidents. Keeping the workforce informed is part of making the assessment effective.

Question 41Tower assembly, erection and dismantling procedures

Before any tower section is lifted, what must be confirmed about the ground or foundation supporting the tower?

  1. It must be covered with loose gravel for drainage
  2. It must be level, stable and rated for the imposed loads Correct answer.
  3. It must be freshly excavated on the day of erection
  4. It must slope slightly away from the tower base

Explanation

Mobile tower bases transfer the full tower and wind loading into the ground, so the surface must be capable of carrying those loads without settlement and must be level so the tower stands plumb. Loose, sloping or freshly disturbed ground cannot provide that support.

Question 42Tower assembly, erection and dismantling procedures

What is the primary purpose of the stabilisers or outriggers fitted to a mobile access tower?

  1. To provide a mounting point for toe boards
  2. To increase the working height of the platform
  3. To allow the tower to be moved while occupied
  4. To widen the base and resist overturning Correct answer.

Explanation

Stabilisers extend the effective base footprint, which increases the tower's resistance to overturning moments from wind and eccentric loading. They do not change working height or permit movement with people on the platform.

Question 43Tower assembly, erection and dismantling procedures

When assembling a prefabricated mobile tower, in what sequence should the components normally be installed?

  1. Top guardrails first, working downward to the base
  2. Braces first, then base frames, then castors last
  3. Base frames and castors, then braces and platforms progressively upward Correct answer.
  4. Platforms first, then braces, then base jacks

Explanation

Mobile towers are built from the ground up: the base frame and castors establish a stable foundation, then horizontal and diagonal braces are added to keep each lift square, with platforms installed as each level is completed. Building downward or leaving the base until last would create an unstable, unbraced structure.

Question 44Tower assembly, erection and dismantling procedures

Why must castors on a mobile tower be locked before the tower is climbed?

  1. To increase the height of the working platform
  2. To stop the castors from being stolen on site
  3. To allow the wheels to swivel more freely
  4. To prevent the tower rolling and to keep the base stable Correct answer.

Explanation

Unlocked castors allow the tower to move unexpectedly as loads shift during climbing, which can cause collapse or a fall. Locking the brakes fixes the base in position and keeps the tower stable while it is in use.

Question 45Tower assembly, erection and dismantling procedures

A tower is to be erected beside a building where wind is funnelled between structures. What is the most appropriate action regarding the manufacturer's wind rating?

  1. Ignore the rating because the tower is only up for one day
  2. Fit the stabilisers and assume the rating no longer applies
  3. Erect it to full height and add extra platforms for ballast
  4. Check the rating for the erected height and reduce height or anchor if needed Correct answer.

Explanation

Manufacturers specify maximum erected heights for given wind conditions, and funnelling can produce local wind speeds well above the general forecast. The safe response is to compare the intended height against the rating and either reduce height, add anchors or take other measures as specified.

Question 46Tower assembly, erection and dismantling procedures

What is the function of the diagonal braces in a mobile tower frame?

  1. To act as a ladder for climbing the tower
  2. To provide rigidity and prevent the frame racking Correct answer.
  3. To support the toe boards at the platform edge
  4. To carry the weight of the platform decking

Explanation

Diagonal braces triangulate the tower frame, giving it stiffness against sideways distortion known as racking. Without them the tower becomes a loose parallelogram and loses stability.

Question 47Tower assembly, erection and dismantling procedures

When should the guardrail and toe board be fitted to a platform level during erection?

  1. Only when the platform is more than ten metres high
  2. Before the platform is used or the next lift is started Correct answer.
  3. After the tower has been signed off by the client
  4. Only after the whole tower is complete

Explanation

Each platform must be fully guarded as soon as it is created and before anyone works from it or builds the next lift above it. Deferring guardrails leaves an unprotected edge that people can fall from during the build.

Question 48Tower assembly, erection and dismantling procedures

What is the correct method for moving a mobile tower a short distance on site?

  1. Lower or remove the platform equipment, then push at the base with the brakes released Correct answer.
  2. Tilt it onto two castors and roll it like a wheelbarrow
  3. Tow it behind a site vehicle using the stabilisers
  4. Push it from the top while a colleague steers the base

Explanation

A tower may only be moved when it is clear of people, materials and loose equipment, and it should be pushed at the base so the load stays low. Pushing from height or tilting the tower risks overturning.

Question 49Tower assembly, erection and dismantling procedures

During dismantling, what should be removed first from the top lift?

  1. The stabilisers
  2. The guardrails and platform materials Correct answer.
  3. The castors at the base
  4. The base frame

Explanation

Dismantling reverses the erection sequence: loose materials, guardrails and platforms at the top are taken down first so the structure is progressively reduced from the top. Base components stay until the upper sections are removed.

Question 50Tower assembly, erection and dismantling procedures

What is the main hazard of overloading a mobile tower platform with stored materials?

  1. The castors may become easier to lock
  2. The platform may fail or the tower may become unstable Correct answer.
  3. The tower will automatically lower its height
  4. The wind rating of the tower will improve

Explanation

Platforms and towers have a rated safe working load, and exceeding it can cause the deck to fail or raise the centre of gravity enough to make the tower unstable. Materials should be kept to what is needed for the task.