A bucket wheel excavator with 20 buckets of capacity 0.5 m3 each, rotates at 5 rev/min. The bucket fill factor is 80%. The excavator loads on to 1200 mm wide belt conveyor. The cross-section area (m2) of the material on the belt is 0.1B2, where B is the belt width in m. The minimum speed of the belt in m/s to avoid spillage of material is
A. 7.23
B. 5.79
C. 4.63
D. 3.7
Answer: Option C
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