Mechanics help11?

Question

A solid shaft transmitting power is limited by both the twist and the shear stress. If the calculated values of shaft diameters based on two independent conditions are 125 mm and 135 mm respectively, then the minimum shaft diameter required shall be:

a.125 mm.

b.135 mm

c.130 mm.

d.260 mm.

Answer 1

b 135mm

i think....

Answer 2

If the minimum diameter based on torsional deflection is 125mm and the minimum diameter based on shear stress is 135mm, then the minimum shaft diameter is 135mm.