Which of the following seed metering mechanisms is/are ACCURATELY matched with its characteristic operating principle?
Options:
(A) Fluted feed roller: Seed rate is adjusted by sliding the roller axially to vary the exposed flute length
(B) Internal double-run: Features two sides (one coarse, one fine) used for small vs large seeds
(C) Cup feed mechanism: Employs small cups on a rotating disc that lift and drop seeds into funnels
(D) Pneumatic seed metering: Uses vacuum suction on perforated plates for precision single-seed singulation
Answer Key:
A, B, C, D
Step-by-Step Solution & Explanation
All four statements describe standard seed metering devices:
1. Fluted rollers adjust seeding rate through axial exposure of flutes. (A is true)
2. Internal double-run has two separate rim sizes for small and bold seeds. (B is true)
3. Cup feed lifts seeds mechanically with cups mounted on a revolving wheel. (C is true)
4. Modern vacuum seeders hold seeds pneumatically against rotating plates for precision singulation. (D is true)
All options A, B, C, D are true.