Machine Design
The largest diameter of an external or internal screw thread is known as

Minor diameter
Pitch diameter
None of these
Major diameter

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

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