Machine Design
Stress concentration is caused due to

Pitting at points or areas at which loads on a member are applied
Variation in properties of material from point to point in a member
All of these
Abrupt change of section

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

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

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