Question Bank • QB_PARAMETRIC_FM_MB_021MSQ • 2 Marks
Section 2: Farm Machinery
Primary Tillage: Mouldboard Ploughs & Forces
Subtopic: Bottom components and share geometry
Question Statement:
Regarding the forces and geometry of a mouldboard plough bottom, which of the following statements is/are CORRECT? (Variation QB_PARAMETRIC_FM_MB_021)
Options:
(A) Vertical suction (clearance) enables the plough bottom to penetrate into the soil to the desired depth
(B) Horizontal suction (clearance) helps the plough maintain its proper width of cut
(C) The landside absorbs the side thrust exerted by the furrow slice on the mouldboard
(D) Specific draft of soil generally increases with an increase in forward operating speed
Answer Key:
A, B, C, D
Step-by-Step Solution & Explanation
1. Vertical suction is the downward clearance between the share point and the landside bottom that enables soil penetration. (A is correct)
2. Horizontal suction is the side clearance between the share point and the landside that holds the plough to its full width of cut. (B is correct)
3. The landside slides against the furrow wall, counteracting the side forces from the mouldboard and stabilising the implement. (C is correct)
4. As forward speed increases, soil acceleration forces increase quadratically, causing the specific draft to increase. (D is correct)
All four statements A, B, C, D are correct.