Site Hazards & Risk Assessment Flashcards
7 cards from real NCCCO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Site Hazards & Risk Assessment flashcards as text
When a crane is operating near an unguarded excavation, what is the minimum safe distance the crane's outriggers or tracks should be positioned from the edge?
Answer: At a distance recommended by a competent person based on soil type and depth
The safe distance from an excavation must be determined by a competent person considering soil type, depth, and surcharge loads, as no single fixed distance applies universally.
Which type of soil condition presents the GREATEST risk of ground subsidence under crane outrigger loads?
Answer: Previously filled or disturbed ground
Previously filled or disturbed ground lacks the load-bearing consistency of undisturbed soil and is most prone to settlement or sudden collapse under heavy loads.
A crane is working in an area with buried utilities. Who is responsible for identifying and marking underground utility locations before crane setup?
Answer: The site contractor or owner who must contact the appropriate one-call system
The site contractor or owner must contact the local one-call utility marking service (811 in the US) to have all underground utilities identified before excavation or heavy equipment setup.
During a pre-lift risk assessment, the operator notices the load chart does not cover the exact radius needed. What should be done?
Answer: Stop the lift and consult the manufacturer or a qualified engineer before proceeding
When load chart values do not cover the exact configuration, the operator must stop and obtain guidance from the crane manufacturer or a qualified engineer to avoid exceeding safe limits.
What hazard does a 'bight' in a wire rope sling create during a lift?
Answer: It creates a kink that severely reduces the sling's rated capacity
A kink (bight deformed under load) permanently damages wire rope fibers and drastically reduces the rope's rated breaking strength, making it a serious safety hazard.
When assessing wind hazards for a crane lift, which factor is MOST critical when lifting large flat or sail-like loads?
Answer: The surface area of the load exposed to wind, which magnifies the actual wind force
Large flat loads act as a sail and can experience significantly greater wind force than the crane's rated wind limits suggest, requiring special consideration of load surface area.
What action should a crane operator take if they observe another worker unknowingly entering the swing radius of the crane's counterweight?
Answer: Immediately stop all crane movement and warn the worker
The operator must immediately halt all crane movement to prevent crushing or striking the worker, as the counterweight swing zone is a struck-by hazard zone.