Machine Design
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have

Right hand threads
Multiple threads
Left hand threads
Pointed threads

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Machine Design
The shear stress at a point in a shaft subjected to a torque is

Directly proportional to the applied torque and the polar moment of inertia
Directly proportional to the polar moment of inertia and to the distance of the point from the axis
Directly proportional to the applied torque and inversely proportional to the polar moment of inertia
Inversely proportional to the applied torque and the polar moment of inertia

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