Match all items in Group I with correct options from Group II:
| Group I (Mechanism) | Group II (Application) |
|---|---|
| i. Slider crank mechanism | a. Tractor steering |
| ii. Four bar linkage mechanism | b. Attachment of pitman to knife head |
| iii. Ball and socket joint | c. Planting unit of rice transplanter |
| iv. Cam and follower mechanism | d. Vertical conveyor reaper |
Options:
(A) i–d,ii–c,iii–b,iv–a
(B) i–b,ii–c,iii–a,iv–d
(C) i–d,ii–c,iii–a,iv–b
(D) i–b,ii–d,iii–a,iv–c
Official Answer Key:
B
Step-by-Step Solution & Explanation
Slider-crank (i) converts rotary PTO drive into the reciprocating stroke that drives the knife head via a pitman (b). Four-bar linkage (ii) is the classic crank-rocker mechanism used to cyclically pick and place seedlings in the rice transplanter's planting unit (c). Ball-and-socket joints (iii) are used in the drag-link/tie-rod ends of the tractor steering (a) linkage. Worm-and-roller (iv) reduction units are used to drive the pickup/conveyor of the vertical conveyor reaper (d).
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