SafetyCâu 688 / 700
Before a mobile crane lift on soft or uneven ground, which practice BEST helps keep the crane stable while lifting?
a.Retract the outriggers so the tires absorb the load
b.Position the load at the maximum radius to spread the weight
c.Skip cribbing to let the outrigger floats sink in for grip
d.Fully extend the outriggers onto firm, level ground with adequate cribbing/pads under the floats
Giải thích
Correct: on soft or uneven ground, fully extending the outriggers and setting them on firm, level ground with cribbing or pads that spread the load keeps the crane stable and prevents settling. Retracting outriggers to lift on tires reduces stability. Maximizing radius reduces capacity and stability. Letting floats sink in instead of cribbing invites uneven settlement and tipping. Adequate ground preparation is essential to a safe lift.
Luyện miễn phí toàn bộ 700 câu hỏi — không cần đăng ký.
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