Question

Match List-I with List-II

List-I (Link)	List-II (Type of load)
(A) Rock shaft	(I) Bending and shear
(B) Lower link	(II) Axial
(C) Upper link	(III) Axial, bending and shear
(D) Lift arm	(IV) Torsion, bending and shear

Choose the correct answer from the options given below:

• A. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
• B. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
• C. (A)-(II), (B)-(I), (C)-(IV), (D)-(III)
• D. (A)-(I), (B)-(IV), (C)-(III), (D)-(II)

Hint:

Ask which of these parts only pushes or pulls in a straight line, and which one has to twist to do its job.

Answer 1

The Correct Option is A

A quicker way to solve this is to trace how load travels from the implement back to the tractor.

The implement's pull and part of its weight land on the two lower links first, since these are the main draft carrying members, so they see axial force plus bending and shear, that is (III).

The upper link only steadies the implement's tilt with a straight two pin connection, so it takes pure axial load, that is (II).

The lift rods pull on the lift arms to raise the implement, bending the arms and shearing their pins, so the lift arm takes (I).

Finally, the rock shaft is the part the hydraulic cylinder actually rotates to move both lift arms at once, which forces it to twist as well as bend and shear, so it takes (IV).

This gives the same pairing, A-(IV), B-(III), C-(II), D-(I).

\[ \text{Correct match} = \text{Option 1} \]