Machine Design
The angle of twist of shaft is

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

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

Belts are available in sets
The new belt will carry more than its share and result in short life
New and old belts will cause vibrations
Only one belt cannot be fitted with other used belts

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Machine Design
In cross or regular lay ropes

Direction of twist of wires in strands is opposite to the direction of twist of strands
Direction of twist of wires and strands are same
Wires are not twisted
Wires in two adjacent strands are twisted in opposite direction

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