Mobile Crane Operator 4 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 Mobile Crane Operator 4 flashcards as text
When a lift plan calls for a 'critical lift,' what threshold typically triggers this designation under ASME P30.1?
Answer: A lift exceeding 75% of the crane's rated capacity or involving exceptional risk
ASME P30.1 defines a critical lift as one that exceeds 75% of the crane's rated capacity or involves unusual risk factors requiring a written lift plan.
Which of the following conditions would require the operator to immediately shut down operations and not resume until corrected?
Answer: The load line has a kinked or birdcaged section
A kinked or birdcaged wire rope has compromised structural integrity and must be removed from service immediately per ASME B30.5.
What is the correct procedure when the operator loses communication with the signal person during a lift?
Answer: Stop all crane movement immediately and wait for communication to be restored
OSHA 1926.1419 requires the operator to stop all movement when communication with the signal person is lost until it is re-established.
Which factor is NOT typically included in a mobile crane pre-shift inspection?
Answer: Operator's personal health assessment
Pre-shift inspections cover mechanical components of the crane; an operator's personal health assessment is not part of the equipment inspection checklist.
A boom angle indicator on a mobile crane is primarily used by the operator to:
Answer: Determine the current boom angle to correlate with load chart radius data
The boom angle indicator allows the operator to read the current boom angle, which is used alongside boom length to determine working radius on the load chart.
When must a qualified rigger be responsible for the rigging used in a crane lift?
Answer: Whenever the load is attached to the crane's hook
OSHA 1926.1425 requires a qualified rigger to be in charge of rigging whenever personnel are required to work in the fall zone or the load is attached to the hook.
If a load chart shows separate columns for 'on outriggers' and 'on rubber,' which configuration always provides the higher rated capacity?
Answer: On outriggers, because they provide a more stable base
Outriggers transfer the crane's load directly to the ground through pads, creating a wider, more stable base than rubber tires and yielding higher rated capacities.