NCCCO MOBILE CRANE QUESTIONS
AND ANSWERS ALREADY PASSED
What structural part of a crane provides stability during lifting?
✔✔ Outriggers provide stability by extending from the sides of the crane to balance the load.
Why is it important to know the boom angle before starting a lift?
✔✔ The boom angle determines the lifting capacity, and exceeding the recommended angle can
cause the crane to become unstable.
How does the load chart assist the crane operator?
✔✔ The load chart helps the operator determine the maximum safe lifting capacity based on the
boom length and load position.
What is the purpose of the crane’s counterweight?
✔✔ The counterweight prevents the crane from tipping over by balancing the heavy load on the
boom.
Why is communication critical between the crane operator and the ground crew?
1
,✔✔ Clear communication ensures the lift is coordinated safely, preventing accidents from
misinterpretations or missed signals.
What should the operator check before using the crane's hoist line?
✔✔ The operator should ensure that the hoist line is free from damage or wear to prevent it from
snapping during lifting.
What is boom deflection, and how can it affect the lift?
✔✔ Boom deflection is the bending of the boom under load, which can make the lift less precise
and potentially unstable.
Why is knowing the center of gravity important when lifting a load?
✔✔ Understanding the center of gravity helps balance the load, preventing it from shifting and
causing instability during lifting.
What is side loading, and why should it be avoided?
✔✔ Side loading occurs when the load is pulled horizontally rather than vertically, which can
strain and damage the crane’s boom.
2
,How does the telescoping boom increase the crane’s versatility?
✔✔ The telescoping boom allows the crane to extend its reach, making it adaptable to different
load positions without moving the crane.
What is the function of a load moment indicator (LMI) on a mobile crane?
✔✔ The LMI monitors the load’s weight and alerts the operator if the crane is nearing its
capacity to prevent overloading.
Why is it important to conduct a pre-operation inspection on the crane?
✔✔ A pre-operation inspection ensures that the crane is in good working condition and free of
defects that could cause accidents.
What should be considered when setting up a mobile crane on uneven ground?
✔✔ Outriggers should be used, and the ground should be leveled or reinforced to ensure stability
and prevent tipping.
How can wind affect crane operations?
✔✔ Wind can cause the load to swing or increase the boom’s deflection, which can lead to
unsafe lifting conditions.
3
, What is the purpose of a jib on a mobile crane?
✔✔ A jib is an extension attached to the boom that increases the crane’s reach and height
capacity for lifting loads.
How does the operator ensure the load is lifted evenly?
✔✔ By positioning the hook directly above the load’s center of gravity and adjusting the rigging
to balance the load.
What is the significance of the safe working load (SWL) for rigging equipment?
✔✔ The SWL is the maximum weight that rigging equipment can safely handle, preventing
failure or breakage during lifting.
Why should tag lines be used when lifting a load?
✔✔ Tag lines help control the load’s movement, preventing it from swinging uncontrollably
during the lift.
What is the function of the crane’s boom stop?
4
AND ANSWERS ALREADY PASSED
What structural part of a crane provides stability during lifting?
✔✔ Outriggers provide stability by extending from the sides of the crane to balance the load.
Why is it important to know the boom angle before starting a lift?
✔✔ The boom angle determines the lifting capacity, and exceeding the recommended angle can
cause the crane to become unstable.
How does the load chart assist the crane operator?
✔✔ The load chart helps the operator determine the maximum safe lifting capacity based on the
boom length and load position.
What is the purpose of the crane’s counterweight?
✔✔ The counterweight prevents the crane from tipping over by balancing the heavy load on the
boom.
Why is communication critical between the crane operator and the ground crew?
1
,✔✔ Clear communication ensures the lift is coordinated safely, preventing accidents from
misinterpretations or missed signals.
What should the operator check before using the crane's hoist line?
✔✔ The operator should ensure that the hoist line is free from damage or wear to prevent it from
snapping during lifting.
What is boom deflection, and how can it affect the lift?
✔✔ Boom deflection is the bending of the boom under load, which can make the lift less precise
and potentially unstable.
Why is knowing the center of gravity important when lifting a load?
✔✔ Understanding the center of gravity helps balance the load, preventing it from shifting and
causing instability during lifting.
What is side loading, and why should it be avoided?
✔✔ Side loading occurs when the load is pulled horizontally rather than vertically, which can
strain and damage the crane’s boom.
2
,How does the telescoping boom increase the crane’s versatility?
✔✔ The telescoping boom allows the crane to extend its reach, making it adaptable to different
load positions without moving the crane.
What is the function of a load moment indicator (LMI) on a mobile crane?
✔✔ The LMI monitors the load’s weight and alerts the operator if the crane is nearing its
capacity to prevent overloading.
Why is it important to conduct a pre-operation inspection on the crane?
✔✔ A pre-operation inspection ensures that the crane is in good working condition and free of
defects that could cause accidents.
What should be considered when setting up a mobile crane on uneven ground?
✔✔ Outriggers should be used, and the ground should be leveled or reinforced to ensure stability
and prevent tipping.
How can wind affect crane operations?
✔✔ Wind can cause the load to swing or increase the boom’s deflection, which can lead to
unsafe lifting conditions.
3
, What is the purpose of a jib on a mobile crane?
✔✔ A jib is an extension attached to the boom that increases the crane’s reach and height
capacity for lifting loads.
How does the operator ensure the load is lifted evenly?
✔✔ By positioning the hook directly above the load’s center of gravity and adjusting the rigging
to balance the load.
What is the significance of the safe working load (SWL) for rigging equipment?
✔✔ The SWL is the maximum weight that rigging equipment can safely handle, preventing
failure or breakage during lifting.
Why should tag lines be used when lifting a load?
✔✔ Tag lines help control the load’s movement, preventing it from swinging uncontrollably
during the lift.
What is the function of the crane’s boom stop?
4
