Machine Design
Brittle coating technique is used for

Experimental stress analysis
Protecting metal against corrosion
Determining brittleness
Protecting metal against wear and tear

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Machine Design
The angle of twist of shaft is

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

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