Machine Design
A localized compressive stress at the area of contact between two members is known as

Shear stress
Bearing stress
Tensile stress
Bending stress

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Machine Design
The angle of twist of shaft is

Inversely proportional to (shaft diameter)⁴
Inversely proportional to (shaft diameter)²
Directly proportional to (shaft diameter)²
Directly proportional to (shaft diameter)⁴

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