Machine Design
In cyclic loading, stress concentration is more serious in

Elastic materials
Brittle as well as ductile materials
Brittle materials
Ductile materials

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Machine Design
The angle of twist of shaft is

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

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