The solid circular shaft of 150mm diameter is machined down to a diameter of 75mm along a part.of the shaft. If, at the transition section of the two diameters, the fillet radius is 12mm, what maximum shear stress is developed when a torque of XXXXkNmm is applied to the shaft? What will the maximum shear stress if the fillet radius reduced to 4mm? 1.8 1.7 - 1.111 1.6 - 1.25 1.5 - 1.666 K 1.4 -- 2 --2.5| 1.3 1.2 1.1 1.0 0.05 0.10 0.15 0.20 0.25 0.30 rld