Machine Design
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being greater than unity
Both radial and axial loads and the ratio of these being less than unity
Axial load only
Radial load only

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Machine Design
In the calculation of induced shear stress in helical springs, the Wahl's stress factor is used to take care of

Combined effect of transverse shear stress and bending stress in the wire
Combined effect of bending stress and curvature of the wire
Combined effect of transverse shear stress and curvature of wire
Combined effect of torsional shear stress and transverse shear stress in the wire

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