Rigger / Lifting Supervisor Interview Question and Answer

• Question: what is the wind speed limit during Rigging ?
  Answer.
  Lifting will be stopped if the wind speed is 32 kmph = 20 mph = 8.998 M/s
• Question: What is tandem lifting?
  Answer.
  A lift-in with two cranes used for lifting is called tandem lifting.
• Question: What is the name of the device that indicates the crane boom angle ?
  Answer.
  Boom angle indicator
• Question: How many types of crane are there?
  Answer.
  1) Mobile Crane
  2) Crawler Crane
  3) Tower Crane
  4) Overhead Crane
  5) Gantry Crane
  6) Mono rail Crane
  7) Floating Crane
• Question: what is SWL ?
  Answer.
  A safe working load is the maximum load that can be applied to the lifting tools safely.
• Question: What is the work radius?
  Answer.
  Is the maximum distance where certain activities for lifting or rigging jobs are in progress.
• Question: What is lifting gear equipment?
  Answer.
  Lifting equipment, also known as lifting gear, is a general term for any equipment that can be used to lift loads.

Also read more: Lifting Supervisor Interview Question and Answer

• Question: What is PWASS?
  Answer.
  PWASS means proximately warning Alarm system. It is installed in heavy equipment like excavators and bulldozers.
  This system automatically gives alarm when anybody come into contact within 5 meters
• Question: What is lifting gear equipment?
  Answer.
  Lifting equipment, also known as lifting gear, is a general term for any equipment that can be used to lift loads.
• Question: What is the load chart?
  Answer.
  Definition of load chart. : a schematic and graphic device to indicate the amount of authorized work yet to be performed by a machine, a group, or any other producing unit in a factory.
• Question: What is SWL?
  Answer.
  The SWL, whose other name is NWL, or normal working load, is determined by dividing the minimum breaking strength (MBS) of a component by a safety factor assigned to that type and use of equipment.
• Question: What are the different types of slings used for lifting ?
  Answer.
  1) synthetic / Nylon webbing
  2) wire rope slings
  3) chain slings
• Question: What is a plug-brake?
  Answer.
  Plug braking, also known as dynamic braking, is a safe way to slow down a vehicle with a series motor when the motor direction is reversed. Without plug braking, if the operator reverses direction while the vehicle is in motion, the armature will lock up.

• Question: What is the maximum wind speed for working at height?
  Answer.
  There is a ‘rule of thumb’ that in the tower climbing industry, it is recommended that climbers do not work at wind speeds greater than 20 knots (23 mph) at their working height.
• Question: What is the maximum wind speed for working on a roof for skating or tiling?
  Answer.
  23 mph, but if you are fixing or handling sheets longer than 5 meters or more than 2 meters above the floor, then 17 mph is allowed.
• Question: What is the safe aisle width for forklift or heavy equipment required?
  Answer.
  The recommended width of aisles is at least 3 feet wider than the largest piece of equipment to be utilized, or a minimum of 4 feet.
• Question: What is lifting gear equipment?
  Answer.
  Lifting equipment, also known as lifting gear, is a general term for any equipment that can be used to lift loads.
• Question: What are the hazards in crane lifting ?
  Answer.
  Hazard: crane topple, suspended load and drop, hit on personnel and structure.
  Equipment failure
  Falling of load
  Load hitting any plant facility
  Crane-hitting plant facilities
• Question: What is the load chart?
  Answer.
  Definition of load chart. : a schematic and graphic device to indicate the amount of authorized work yet to be performed by a machine, a group, or any other producing unit in a factory.
• Questions: What is ringing & slinging?
  Answer.
  It is a part of mechanical handling activity which involves lifting and shifting of heavy material through the safe use of equipment, machinery and devices. Such as crane , wire ropes, hooks , shackles, chain pulleys, etc.
• Question: What are the requirements of a man basket ?
  Answer.
  It should be designed and fabricated according to standards, have a party certificate, two guide ropes, and damage-free lifting gear. The load-bearing capacity should be written on man-made basket shackles with cotter pins only to be used.
• Question: What machines are used to lift heavy objects?
  Answer.
  A machine for lifting heavy objects on an assembly line is shown. It consists of a straight member ABC, a quarter-circular member CDE, and a hydraulic cylinder BD In the position shown, the hydraulic cylinder is vertical.
• Question: What is LMI OR RCL in crane?
  Answer.
  The LMI (load movement indicator), also known as the RATE CAPACITY LIMITOR (RCL), is an operational aid that warns a crane operator of approaching overload conditions and over-hoist conditions that could cause damage to equipment and personnel.
• Question: What is a working load limit?
  Answer.
  The maximum load that each synthetic web tiedown manufacturer is permitted to apply is known as the working load limit, or WLL. It cannot be greater than one-third of the assembly’s breaking strength. This implies that a strap with a 16,200-pound break strength would have a 5,400-pound WLL.
• Question: What is the difference between WLL and SWL?
  Answer.
  The WLL work load limit is determined by the manufacturers, but SWL is determined by a third party inspection authority. SWL is always lower than the WLL, also known as the Minimum Breaking Load (MBL).SWL or WLL are calculated by dividing the MBL by a safety factor.
• Question: What are the two types of plans we use for our lifts and what criteria goes with each (pick all that apply)?
  Answer.
• General Lift Plan, 0 to 75%
• General Lift Plan, 75 to 85%, Section 1 and 2 Completed
• Critical Lift Plan, 85% or Greater
• Critical Lift Plan, Multiple Crane Pick
• Critical Lift Plan: Picking Within the Radius of Power Lines.
• Question: What are the main causes of crane accidents?
  Answer.
  The usage of outriggers, fallen loads, rigging malfunctions, overturned cranes, collapsing or buckling booms, falls, and incorrect disassembly or assembly of the crane are the main causes of crane accidents. Unfortunately, approximately 11% of crane-related accidents are the result of mechanical malfunction.
• Question: When will boom truck lifting be considered critical lifting?
  Answer.
  A lift-by-boom truck that exceeds 90% of its rated capacity while it is lifting the load at a load radius of more than 50% of its maximum permitted radius.
• Question: What are lifting accessories?
  Answer.
  Lifting accessories are pieces of equipment that are used to attach the load to lifting equipment, providing a link between the two. Any lifting accessories used between lifting equipment and the load may need to be taken into account in determining the overall weight of the load.
• Question: How will you calculate the load on the crane?
  Answer.
  Example: You need to lift a load of 15 tons (30,000 pounds) over a distance of 25 feet. The distance is measured from the centre pin of the crane to the centre of the load. Once you determine the distance, look on that line for the largest capacity; that will indicate how many feet of boom must be extended.
• Question: At what height is a medical certificate required.?
  Answer.
  2.3 metre
  Any electrician or worker working on electrical panel at height must therefore have a medical certificate of fitness and wear a safety harness (of which the lanyard is 2.5m long and cannot be attached at any point higher than 2.5m above ground level).

Note: some clients need medical certificate for working at height, and after fitness, they require 2.3 meters for working at height, otherwise 1.8 meters.

• Question: What are different types of cranes?
  Answer.
  So what are the different types of cranes used in construction?
  Mobile cranes… Telescopic Crane, Tower Crane., Truck-mounted crane (also known as boom truck or picker truck) Rough Terrain Crane. Loader Crane (also known as a folding boom crane) Overhead Crane.
• Question: What are the cranes made out of?
  Answer.
  Steel sheets can be bent and their long sides welded together to create hollow tubes, like the ones seen in big cranes’ latticed booms. A revolving steel cone can also be used to pierce steel rods to create them. Steel wires are utilized to make the cables that are used to hoist weights.
• Question: What is TAC3000 in Tower Crane?
  Answer.
  The C-3000 is a safe and effective monitoring system designed to prevent serious and occasionally fatal accidents caused by human error. This useful support tool increases site productivity and promotes a safer work environment. However, because the operator still maintains control over how the tower crane performs, TAC-3000 is not a fail-safe safety system.
• Question: What is a critical lift plan?
  Answer.
  Critical lifts include lifts made where the load weight is greater than 75% of the rated capacity of the crane; lifts that require the load to be lifted; and lifting that is swung or placed out of the operator’s view. lifts made with more than one crane are also called critical lifting.

36. Question: What is LMI or RCL in a crane?
Answer.
The LMI (load movement indicator), also known as the RATE CAPACITY LIMITOR (RCL), is an operational aid that warns a crane operator of approaching overload conditions and over-hoist conditions that could cause damage to equipment and personnel.

• Question: How are slings inspected?
  Answer.
  All slings must be inspected before every use, and periodically they should be inspected thoroughly and shall be rejected. If found, one-third of the original diameter of the outside individual wires serves as a corrosion distortion link, crushing the broken wire.
• Question: What are the requirements of a crane lifting operation?
  Answer.
  1) crane position on firm, level ground with wood pads and steel plates
  2) outriggers are fully extended, and tires are off the ground
  3) certified operator and riggers are available safe load indicator is working on the check list filled by competent people.
• Question: what is the potential hazards while performing lifting operation ?
  Answer.
  Hazards:
  1) Accidentally hit or crushed by hanging load
  2) Falling object
  3) collapse of lifting equipment due to overhead
  4) overturning of the crane
  5) Failure to lift gears such as Eire ropes , hooks , shackles, eyebolts, chains, etc.
• Question: what is lifting plan ?
  Answer.
  It is a document prepared for planning a critical lift by calculating and considering all factors that are going to effect the lift, selecting the correct tools and cranes, and ensuring the safe lifting procedure to be followed for the particular lift, giving details such as the size and weight of the object to be lifted, which crane is used for lifting and what the safety factor is, where the crane is positioned, from where the load is lifted, where it is fitted, and the size and SWL of each lifting tool used. A load chart is attached to it.
• Question: What are lifting accessories?
  Answer.
  Lifting accessories are pieces of equipment that are used to attach the load to lifting equipment, providing a link between the two. Any lifting accessories used between lifting equipment and the load may need to be taken into account in determining the overall weight of the load.
  Examples of lifting accessories include:
  fibre or rope slings. chains (single or multiple legs). Hooks, eyebolts, and spreader beams. Magnetic and vacuum devices.
• Question: How will you calculate the load on the crane?
  Answer.
  Example: You need to lift a load of 15 tons (30,000 pounds) over a distance of 25 feet. The distance is measured from the centre pin of the crane to the centre of the load. Once you determine the distance, look on that line for the largest capacity; that will indicate how many feet of boom must be extended.
• Question: What are the cranes made out of?
  Answer.
  Steel sheets can be bent and their long sides welded together to create hollow tubes, like the ones seen in big cranes’ latticed booms. A revolving steel cone can also be used to pierce steel rods to create them. 3. Steel wires are utilized to make the cables that are used to hoist weights.
• Question: What are the categories for mobile cranes?
  Answer.
  The categories of licenses for mobile cranes
  are as follows:
  CN: Non-slewing mobile crane (greater
  than 3 tons of capacity.
  C2: Slewing mobile crane (up to 20
  tonnes)
  C6: Slewing mobile crane (up to 60
  tonnes)
  C1: Slewing mobile crane (up to 100
  tonnes)
  C0: Slewing mobile crane (open/over100 100 tons)
• Question: what is lifting plan comprises about?
  Answer.
  Lift Plan.
  A lift plan is prepared or identified for every lift. The lift plan comprises, as given below,.
  1) The competent person planning the lift.
  2) Calculations.
  3) Equipment is required.
  4) Personnel required and their particular roles.
  5) Step-by-step instructions.
  6) Communication methods are to be used.
  7) contingency and rescue plans.

• Question: What are the hazards and control measures for crane lifting?
  Answer.
  Some more hazards are below
  Crane topple, suspended load and drop, hit on personnel and structure.
  Control measure:
  Lifting plan, permit to work, equipment maintenance and checklist, competent crane operator, cordon off the lifting zone and correct rigging method, competent rigger and signal man, tag line to control the load.
• Question: Describe the anti-two-block work in cranes.
  Answer.
  Anti-two-blocking is a safety device in cranes that automatically prevents damage from contact between the load block, overhaul ball, or similar component and the boom tip, fixed upper block or similar component.
  It was manufactured in 1992.
• Question: What is the lifting plan / rigging plan?
  Answer.
  A rigging plan is developed every time a heavy load is being lifted. The basic idea behind a rigging plan is to have control and establish safety precautions. It is an important planning process that will identify all hazardous situations that might be encountered during lifting.
• Question: What is the load chart?
  Answer.
  The meaning of a load chart. a diagram and visual aid to show how much approved work still needs to be done by a machine, a team, or any other manufacturing unit in a plant.
• Question: What is SWL?
  Answer.
  The SWL the other name is (NWL) Normal Working Load. A safe working load is determined by dividing the minimum breaking strength (MBS) of a component by a safety factor assigned to that type and use of equipment.
• Question: What are the most common crane incidents?
  Answer.
  1) Cranes contacting high voltage power lines
  2) Cranes tipping over
  3) Booms bending because of overloading
  4) Materials falling because of improperly secured loads or rigging
  5) Structural failure of the crane itself
  6) Incidents as a result of poor communication between the operator and site personnel.

• Question: What is the difference between WLL and SWL?
  Answer.
  The WLL work load limit is determined by the manufacturers, but SWL is determined by a third party inspection authority. SWL is always lower than the WLL, also known as the Minimum Breaking Load (MBL).SWL or WLL are calculated by dividing the MBL by a safety factor.
• Question: What is the safe aisle width for forklift or heavy equipment required?
  Answer.
  The recommended width of aisles is at least 3 feet wider than the largest piece of equipment to be utilized, or a minimum of 4 feet.
• Question: What is the maximum wind speed for working at height?
  Answer.
  There is a ‘rule of thumb’ that in the tower climbing industry, it is recommended that climbers do not work at wind speeds greater than 20 knots (23 mph) at their working height.
• Question: Describe the rigging load capacity of riggers of all levels.
  Answer.
  1) Rigger I require lifts over 40 tons and must approve all lift plans
  2) Rigger II can not rig a load over 40 tons
  3) Rigger III can not rig a load over 10 tons