Machine Design
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of

Brown colour
Yellow colour
Grey colour
White colour

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Machine Design
The angle of twist of shaft is

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

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