Hoisting and Rigging Hazards UPDATED
Exam Questions and CORRECT Answers
The most important precaution in rigging and hoisting is ? - Correct Answer- To determine
load weight before attempting any lift.
Determine the available capacity of the equipment being used. Rig the load so that it is stable.
Remember that - Correct Answer- (Unless the center of gravity of the load is directly below
the hook, the load will shift)
Make allowances for any unknown factors. In addition, riggers must be aware of common
hazards as listed. - Correct Answer- Working Load Limits (WLL) not known. Know the
working load limits of the equipment and tackle being used. Never exceed these limits.
Defective components.
Examine all hardware, equipment, tackle, and slings before use. Destroy any defective
components. Equipment merely discarded may be picked up and used by someone unaware
of its defects. - Correct Answer- Unsafe equipment.
Do not use any equipment that is suspected to be unsafe or unsuitable until its suitability has
been verified by a competent person.
Hazardous wind conditions.
Never carry out any hoisting or rigging operation when winds create hazards for workers, the
general public, or property. Assess load size and shape to determine whether high winds may
cause problems. In particular, avoid handling loads that present large wind-catching surfaces.
Even though the weight of the load is within the normal capacity of the equipment, high or
gusting winds may prevent proper control during the lift. Wind-loading can be critical to how
the load is rigged, lifted, and landed, with consequences for the safety of everyone involved. -
Correct Answer- Hazardous weather conditions.
When the visibility of riggers or hoist crew is impaired by snow, fog, rain, darkness, or dust,
strict supervision must be exercised and, if necessary, the lift should be suspended. At sub-
freezing temperatures, supervision must ensure that no part of the hoisting device or tackle is
shock-loaded or impacted, since brittle fracture of the steel may result.
Electrical contact.
, When working with or around cranes that are within a boom's length of any powerline,
ensure that a competent sign person is stationed at all times within view of the operator to
warn when any part of the machine or its load approaches the minimum distances specified.
750 to 150,000 volts - 10 feet
150,001 to 250,000 volts - 15 feet
Over 250,000 - 20 feet - Correct Answer- Be especially careful when working near overhead
lines that have long spans. These lines tend to swing laterally in the wind and can cause
unexpected contact.
Hoist line not plumb.
The working load limits of hoisting equipment apply only to freely suspended loads on plumb
hoist lines. If the hoist line is not plumb during load handling, side loads are created which
can destabilize the equipment and cause structural failure with no warning. - Correct Answer-
Common Hazards to watch for are? - Correct Answer- Working Load Limit
Defective components
Unsafe equipment
Hazardous wind conditions
Hazardous weather conditions
Electrical contact
Hoist line not plumb
Factors that Reduce Capacity of Equipment:
The working load limits of all hoisting and rigging equipment are based on almost ideal
conditions seldom achieved in the field. Riggers must therefore recognize the factors that can
reduce the capacity of equipment. - Correct Answer- 1. Swing - The rapid swinging of
suspended loads subjects equipment to additional stresses that can cause collapse. The force
of the swinging action makes the load drift away from the machine, increasing the radius and
side-loading the equipment. The load must always be kept directly below the boom point or
upper load block.
2. Conditions of equipment.
The rated working load limits apply only to equipment and hardware in good conditions. Any
equipment damaged in service should be taken out of service and repaired or destroyed. -
Correct Answer-
Exam Questions and CORRECT Answers
The most important precaution in rigging and hoisting is ? - Correct Answer- To determine
load weight before attempting any lift.
Determine the available capacity of the equipment being used. Rig the load so that it is stable.
Remember that - Correct Answer- (Unless the center of gravity of the load is directly below
the hook, the load will shift)
Make allowances for any unknown factors. In addition, riggers must be aware of common
hazards as listed. - Correct Answer- Working Load Limits (WLL) not known. Know the
working load limits of the equipment and tackle being used. Never exceed these limits.
Defective components.
Examine all hardware, equipment, tackle, and slings before use. Destroy any defective
components. Equipment merely discarded may be picked up and used by someone unaware
of its defects. - Correct Answer- Unsafe equipment.
Do not use any equipment that is suspected to be unsafe or unsuitable until its suitability has
been verified by a competent person.
Hazardous wind conditions.
Never carry out any hoisting or rigging operation when winds create hazards for workers, the
general public, or property. Assess load size and shape to determine whether high winds may
cause problems. In particular, avoid handling loads that present large wind-catching surfaces.
Even though the weight of the load is within the normal capacity of the equipment, high or
gusting winds may prevent proper control during the lift. Wind-loading can be critical to how
the load is rigged, lifted, and landed, with consequences for the safety of everyone involved. -
Correct Answer- Hazardous weather conditions.
When the visibility of riggers or hoist crew is impaired by snow, fog, rain, darkness, or dust,
strict supervision must be exercised and, if necessary, the lift should be suspended. At sub-
freezing temperatures, supervision must ensure that no part of the hoisting device or tackle is
shock-loaded or impacted, since brittle fracture of the steel may result.
Electrical contact.
, When working with or around cranes that are within a boom's length of any powerline,
ensure that a competent sign person is stationed at all times within view of the operator to
warn when any part of the machine or its load approaches the minimum distances specified.
750 to 150,000 volts - 10 feet
150,001 to 250,000 volts - 15 feet
Over 250,000 - 20 feet - Correct Answer- Be especially careful when working near overhead
lines that have long spans. These lines tend to swing laterally in the wind and can cause
unexpected contact.
Hoist line not plumb.
The working load limits of hoisting equipment apply only to freely suspended loads on plumb
hoist lines. If the hoist line is not plumb during load handling, side loads are created which
can destabilize the equipment and cause structural failure with no warning. - Correct Answer-
Common Hazards to watch for are? - Correct Answer- Working Load Limit
Defective components
Unsafe equipment
Hazardous wind conditions
Hazardous weather conditions
Electrical contact
Hoist line not plumb
Factors that Reduce Capacity of Equipment:
The working load limits of all hoisting and rigging equipment are based on almost ideal
conditions seldom achieved in the field. Riggers must therefore recognize the factors that can
reduce the capacity of equipment. - Correct Answer- 1. Swing - The rapid swinging of
suspended loads subjects equipment to additional stresses that can cause collapse. The force
of the swinging action makes the load drift away from the machine, increasing the radius and
side-loading the equipment. The load must always be kept directly below the boom point or
upper load block.
2. Conditions of equipment.
The rated working load limits apply only to equipment and hardware in good conditions. Any
equipment damaged in service should be taken out of service and repaired or destroyed. -
Correct Answer-
