Question

Select the most appropriate sequence of involvement of different parts of combine harvester from crop interception to grain collection

(A) Cutter bar
(B) Auger
(C) Straw walker
(D) Cylinder and concave
(E) Reel

Choose the correct answer from the options given below:

• A. (A), (B), (C), (D), (E).
• B. (E), (A), (B), (D), (C).
• C. (A), (B), (E), (D), (C).
• D. (E), (C), (D), (A), (B).

Hint:

Trace the crop's path: first touched, then cut, then fed in, then threshed, then the straw is separated.

Answer 1

The Correct Option is B

Step 1: Follow the crop's actual path through a combine harvester, from the moment it is first touched to the moment grain is collected.

Step 2: The reel (E) is the first part to touch the standing crop. Its rotating bats sweep the crop backward and hold it upright against the cutter bar so it can be cut cleanly, so reel comes first.

Step 3: The cutter bar (A) then shears the crop stems near the ground, right after the reel has gathered and steadied them.

Step 4: Once cut, the crop falls onto the platform, and the auger (B) draws the loose material sideways toward the center feeder opening, feeding it into the machine.

Step 5: The feeder house carries this material to the cylinder and concave (D), where the crop is rubbed and beaten to thresh the grain out of the ear or head.

Step 6: Finally, the straw walker (C) carries the threshed straw further back, shaking loose any remaining grain so it falls down to the cleaning shoe while the straw is discharged out the back.

Step 7: So the correct order is Reel, Cutter bar, Auger, Cylinder and concave, Straw walker, that is (E), (A), (B), (D), (C), matching option 2.