Discussion

Match List - I with List - II :

Choose the most appropriate answer from the options given below :

Answer: A

The correct matching is (a)-(ii), (b)-(iv), (c)-(i), (d)-(iii).

Unwin's formula, \(d = 6\sqrt{t}\) (mm), gives the rivet diameter from the plate thickness: rivets (a-ii).
The Wahl factor corrects the shear stress in a helical spring for curvature and direct shear (b-iv).
Reynolds' equation governs the pressure in a hydrodynamic oil film, the basis of journal bearing design (c-i).
The Lewis form factor appears in the Lewis equation for the bending strength of gear teeth (d-iii).

The other options give the Wahl factor to gears or Unwin's formula to bearings, neither of which is where they are used.

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