Interview Questions & answers about Rigging Safety

1.Question.what is width of crane tyre?
Answer.Average 25mm
2. what is the wind speed limit during Rigging ?
Ans -Lifting will be stopped , if the wind speed is --
* 32 km h = 20 mile ph = 8.998 M/s
3. what is tandem lifting ?
Ans - A lift in with two crane are used for lifting is called tend um lifting.
4.Question.what is the name of device which indicate the crane boom angle ?
Answer. BAI_Boom angle indicator
5. How many types of crane ?
Ans -
* Mobile crane * crawler crane
* Tower crane * overhead crane
* Gantry crane * Monorail crane
6. what is SWL ?
Ans - safe working load is the maximum load that can apply to the lifting tools , safely.
7.what is work radius ?
Ans - Is the maximum distance where a certain activities for lifting or rigging jobs in progress.
8.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.
9.Question.what is PWASS?
ANSWER.PWASS means proximately warning Alarm system .It is installed in heavy
equipment like excavator, bulldozer. This system automatically give alarm when anybody
come in touch within 5 metre
10.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.
11.Question.what is PWASS?
ANSWER.PWASS means proximately warning Alarm system .It is installed in heavy
equipment like excavator, bulldozer. This system automatically give alarm when anybody
come in touch within 5 metre.
12. 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.

13.Question.what is SWL?

ANSWER The SWL the another name is (NWL)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.

14.what is parts of crane ?

Ans-

* Boom. * sling * shackle

* Tying jib * Antiblock

* outer rigger * Auxiliary hoist

* pulley. * web sling

* LMI (load movement indicator ).

15.what is different types of slings used for lifting ?

Ans --

* synthetic / Nylon webbing

* wire rope slings

* chain slings

16.Question : What is a plug brake?

Answer

Plug braking, also referred to 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.

17. 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 the working height.

18. Question.what is the maximum wind speed for working on roof for skating or tilings?

Answer. 23 mph but if you are fixing or handling sheet longer than 5 metres more than 2

metre above the floor then 17 mph is allowed

19. 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 equipment

to be utilized, or a minimum of 4 feet.

20.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.

21. Question: What are the hazards in crane lifting ?

Answer.Hazard;

Crane topple, suspended load and drop, hit on to 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.

23. Questions. what is Rigging & slinging ?

Ans - It is a part of mechanical handling activity which involves lifting and shifting of heavy

material through the safe use of equipment, machinery of devices. Such as crane , wire

rope , hooks , shackles and chain pulleys etc.

24. What are the requirements of a man basket ?

Ans - It should be designed and fabricated according to standards have a party certificate

two guide rope damage free lifting gears the load bearing capacity should be written on man

basket shackles with cotter pin only to be used.

25. 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.

26.Question: What is LMI OR RCL in crane?

ANSWER The LMI(load movement indicator) another name is RATED CAPACITY

LIMITER(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.

27.Question.What is a working load limit?

Answer.

The working load limit, also marked at WLL, is the maximum allowable load assigned to

each synthetic web tie down by the manufacturer which is not to exceed one-third of the

complete assembly breaking strength. This means a strap with a break strength of 16,200

lbs. would have a WILL of 5,400 lbs.

28. Question. What is difference between WLL and SWL?

ANSWER.WILL work load limit is determined by the manufacturers but SWL is determined

by a third party inspection authority.SWL is always lower than the WALL,also known as the

Minimum Breaking Load (MBL).SWL or WLL are calculated by dividing the MLB by a safety

factor.

29.Question: What are the two types of plans we use for our lifts and what criteria goes with

each (pick all that apply)?

1. General Lift Plan, 0 to 75%

2. General Lift Plan, 75 to 85%, Section 1 and 2 Completed

3. Critical Lift Plan, 85% or Greater

4. Critical Lift Plan, Multiple Crane Pick

5. Critical Lift Plan, Picking Within the Radius of Power lines.

30. Question What are the main causes of crane accidents?

Answer.

The major causes for crane accidents include: outrigger use, dropped loads, rigging failure,

overturned cranes, boom collapsing or buckling, falls and the improper dismantling or

assembly of the crane. Sadly, just about 11 percent of all the accidents relating to cranes are

caused by some kind of mechanical failure.

31. Question. when boom truck lifting is considered critical lifting?

Answer Question.when boom truck lifting will be considered as a 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.

32.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.

33. Question. How will you calculate load on crane?

Answer EXAMPLE: You need to lift a load of 15 tons (30,000 pounds) a distance of 25 feet.

The distance is measured from the center pin of the crane to the center 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.

34.Question At what Height medical certificate is required.?

Answer 2.3 metre

If any electrician or worker working on electrical panel at height and therefore must have a

medical certificate of fitness and wear a safety harness(of which the lanyard is 2.5m length

and cannot be attached at any point higher than 2.5m above ground level.

35.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 know as a folding

boom crane) ...Overhead Crane.

36.Question: What are the cranes made out of?

Answer

Hollow tubes, such as those used to form the latticed booms of large cranes, may be made

by bending sheets of steel and welding the long sides together. They may also be made by

piercing steel rods with a rotating steel cone. 3 The cables used to lift weights are made

from steel wires.

37.Question.What is TAC3000 in Tower crane?

AnswerC-3000 is a safety and efficient monitoring system which helps to prevent serious

and even fatal accidents which can be caused by human error. With this efficient helping

tool, it increases site productivity and a safer operating environment. However, TAC-3000 is

not a fail safe safety system as the tower crane operation is still in the operator's control.

38. 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 which require load to be lifted, lifting which is swung or placed out

of the operator's view , it's also considered critical lifting. lifts made with more than one

crane is also said critical lifting.

39.Question: What is LMI OR RCL in crane?

ANSWER The LMI(load movement indicator) another name is RATED CAPACITY

LIMITER(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.

40.How sling are inspected ?

And - All sling must be inspected before every use and periodically it should be inspected

thoroughly and shall be,rejected. If found were one third of the original outside the diameter

of outside individual wires serve corrosion distortion linking crushing bird logins broken wire.

41.what are the requirements of a crane lifting / operation ?

Ans -

* crane position on firm & level ground with wood pads and steel plates

* outriggers are fully extended , tires are off the ground

* certified operator and rigger are available safe load indicator is working the checklist filled

by competent persons.

42.what is the potential hazards while performing lifting operation ?

Ans - Hazards:

* Accident hit or crush by hanging load

* Falling object

* collapse of lifting equipment due to overhead

* overturning of the crane

* Failure of lifting gears such as Wire ropes , hooks , shackles, eyebolts, chain etc.

43. what is lifting plan ?

Ans - It is document prepare for planning a critical lift by calculating and considering all

factors which is going

44.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 leg). Hooks, Eyebolts Spreader beams.

Magnetic and vacuum devices

45.Question. How will you calculate load on crane?

Answer EXAMPLE: You need to lift a load of 15 tons (30,000 pounds) a distance of 25 feet.

The distance is measured from the center pin of the crane to the center 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 medical certificate is required.?

Answer 2.3 metre

If any electrician or worker working on electrical panel at height and therefore must have a

medical certificate of fitness and wear a safety harness(of which the lanyard is 2.5m length

and cannot be attached at any point higher than 2.5m above ground level

Note.some clients need medical certificate for working at height then after fitness required

2.3 metre for working at height otherwise 1.8 metre.

49. Question: What are the cranes made out of?

Answer

Hollow tubes, such as those used to form the latticed booms of large cranes, may be made

by bending sheets of steel and welding the long sides together. They may also be made by

piercing steel rods with a rotating steel cone. 3 The cables used to lift weights are made from

steel wires.

50. Question.what are the categories for mobile crane?

Answer The categories of licence for mobile cranes

are as follows:

CN – Non-slewing mobile crane (greater

than 3 tonne 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/over 100 TON

51. 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 required.

4.Personnel required and their particular roles.

5.Step-by-step instructions.

6. Communication methods to be used.

7. Contingency and rescue plans

52. Question.What is TAC3000 in Tower crane?

AnswerC-3000 is a safety and efficient monitoring system which helps to prevent serious

and even fatal accidents which can be caused by human error. With this efficient helping

tool, it increases site productivity and a safer operating environment. However, TAC-3000 is

not a fail safe safety system as the tower crane operation is still in the operator's control.

53. Question. Write hazards and control measures for crane lifting?

Answer - Some more Hazards below

Crane topple, suspended load and drop, hit on to 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

signalman, tagline to control the load.

54.Question.Describe about Anti two block work in crane?

Answer.Anti two-blocking is a Safety device in crane which automatically prevents damage

from contact between the load block, overhaul ball, or similar component, and the boom tip

or fixed upper block or similar component.

It was manufactured in 1992.

55.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.

56.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.

57.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 which require load to be lifted, lifting which is swung or placed out

of the operator's view , it's also considered critical lifting. lifts made with more than one

crane is also said critical lifting.

59.Question.what is SWL?

ANSWER The SWL the another name is (NWL)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.

60. Question.what is the name of device which which indicate the crane boom angle.

ANSWER.BAI.

BOOM ANGLE INDICATOR

61. Question. What are the most common crane incidents?

Answer.

• Cranes contacting high voltage power lines

• Cranes tipping over

• Booms bending because of overloading

• Materials falling because of improperly secured loads or rigging

• Structural failure of the crane itself

• Incidents as a result of poor communication between the operator and site

person

62.Question. What is difference between WLL and SWL?

ANSWER.WILL work load limit is determined by the manufacturers but SWL is determined

by a third party inspection authority.SWL is always lower than the WALL,also known as the

Minimum Breaking Load (MBL).SWL or WLL are calculated by dividing the MLB by a safety

factor

63.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 equipment

to be utilized, or a minimum of 4 feet.

64.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 the working height.

65. Question.what are the mobile crane?

Answer The categories of licence for mobile cranes

are as follows:

CN – Non-slewing mobile crane (greater

than 3 tonne 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/over 100 TON

Question.what is the name of device which indicate the crane boom angle ?

Answer.

BAI_Boom angle indicator

66.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 required.

4.Personnel required and their particular roles.

5.Step-by-step instructions.

6 Communication methods to be used.

7. Contingency and rescue plans.

65.Question.What is lifting plan?

Ans: It is the document prepared for planning a critical lift by calculating and considering all

factors which is going to affect the lift and there by selecting the correct tools and cranes and

ensure 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,

size and SWL of each lifting tool used. And load chart is attached with it.

66 .Describe the Rigging load capacity of riggers of all levels ?

Ans -

* Rigger I is required for lifts over 40 tons, and must approve all lift plans

* Rigger II can not rig a loaf over 40 tons

* Rigger III can not rig a load over 10 tons.