Mobile Crane Operator Test 1 Flashcards
6 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 6 Mobile Crane Operator Test 1 flashcards as text
What is the first action a mobile crane operator should take upon arriving at a new job site?
Answer: Conduct a pre-operation site assessment identifying hazards, overhead lines, ground conditions, and obstructions
A thorough site assessment identifying overhead power lines, underground utilities, ground conditions, restricted areas, and work zone hazards must be completed before any crane setup or operation begins.
What information must be in the cab of a mobile crane during operations?
Answer: Current load charts for the specific crane configuration in use, along with the crane's operating manual
Current load charts for the specific crane configuration being operated, and the operating manual, must be accessible in the operator's cab during all operations for reference.
What is the purpose of the anti-two-block (ATB) device on a mobile crane?
Answer: To prevent the hook block from rising into contact with the boom tip sheave by cutting off hoist power before contact occurs
The anti-two-block device monitors the distance between the hook block and the boom tip sheave, cutting off hoist power before contact to prevent two-blocking, which can break wire rope and drop loads.
What is a load line hitch and what determines the working load limit of the hitch?
Answer: A load line hitch is the method of attaching rigging to the load; the WLL is determined by the hitch type (vertical, choker, basket) and the sling's rated capacity
The working load limit of a rigging hitch depends on both the sling's rated capacity and the hitch configuration: vertical hitches use 100%, choker hitches reduce WLL by at least 25%, and basket hitches can increase WLL up to 200% depending on the load angle.
What is the significance of a crane's 'rated capacity' versus its 'tipping load'?
Answer: Rated capacity is a fraction of tipping load, incorporating a safety factor so the crane remains stable with a margin before actual tipping occurs
Rated capacity is set at 75% of tipping load (per ASME B30.5), providing a 25% stability safety margin between maximum rated operation and the load that would actually cause tipping.
When a crane operator disagrees with a lift supervisor about the safety of a planned lift, what is the appropriate course of action?
Answer: Refuse to perform the lift and explain safety concerns; the operator has the authority and responsibility to refuse unsafe lifts
The crane operator has both the authority and the professional responsibility to refuse any lift that appears unsafe, regardless of supervisor instructions or production pressure.