a) Line of pull
b) Size of plough
c) Draft
d) Centre of power
Answer: b
Explanation: It is the maximum clearance between the landside and a horizontal plane touching point of share at its gunnel side and heal of land side. This suction helps the plough to cut the proper width of furrow slice. This clearance varies according the to the size of the plough, which is the distance from wing of the share to the line joining the point of share and heel of landside.
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