For a square key made of mild steel the shear and crushing s

For a square key made of mild steel, the shear and crushing strengths are related as shear strength = crushing strength shear strength > crushing strength shear strength

Solution

7. Shear strength is equal to crushing strength (A)

8.Both the strength and rigidity of shaft (C)

9.Hollow shaft.....because Split couplings are used for hollow shafts as split couplings involve only the outer surface for gripping without using any keys. Which is suitable for hollow shafts.(D)

10 used to conect to parallel and non collinear shafts which have smaller lateral misallignment.