35
Which of the following is an obtuse angle-type furrow opener?
EXPLANATION
Size Reduction & Mechanical Expression
- Furrow Opener Geometrical Classifications:
- Furrow openers in seed drills are categorized by the angle made with the soil surface:
- Acute angle openers: Penetrate by suction/cutting (e.g., Hoe type, Shovel type).
- Right angle openers: Vertical penetration (e.g., Double disc type).
- Obtuse angle openers: The cutting edge slopes backward forming an obtuse angle with the direction of travel, sliding over crop residues and trash without clogging (e.g., Stub runner type, curved runner).
- Conclusion: Stub runner type (Option 3).
Correct option: (3) Stub runner type
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