11. The shear modulus of resilience is proportional to
12. For a shoe brake, the equivalent coefficient of friction is equal to (where μ = Actual coefficient of friction, and θ = Semi-block angle)
13. Set screws are
14. A key capable of tilting in a recess milled out in a shaft is known as
15. A special case of ductility which permits materials to be rolled or hammered into thin sheets, is called
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