Subtopic: Functional requirements, principles of working, construction and operation of manual, animal, tractor and renewable energy operated equipment for tillage, sowing, planting, fertilizer application, inter-cultivation, spraying, mowing, chaff cutting, harvesting and threshing
Question Statement:
Regarding standard disc plough construction and kinematics, which of the following statements are CORRECT?
Options:
(A) Disc angle is the angle that the plane of the cutting edge makes with the line of travel, typically $42^\circ$ to $45^\circ$
(B) Tilt angle is the angle that the plane of the cutting edge makes with a vertical line, typically $15^\circ$ to $25^\circ$
(C) Increasing the tilt angle improves penetration of the disc in hard, dry soils
(D) A disc plough has lower draft requirement than a mouldboard plough in stony or root-infested soils
Answer Key:
A, B, C, D
Step-by-Step Solution & Explanation
1. Disc angle is measured between the disc cutting edge plane and direction of travel, typically $42^\circ$ to $45^\circ$. (Statement A is True)
2. Tilt angle is measured between the disc plane and the vertical line, typically $15^\circ$ to $25^\circ$. (Statement B is True)
3. Increasing the tilt angle provides downward suction, facilitating penetration into hard ground. (Statement C is True)
4. Because discs roll over obstructions rather than dragging, disc ploughs operate with lower draft and risk of breakage in stony/root-infested soils. (Statement D is True)