Machine Design
The piston pin bearings in heavy duty diesel engines are

Spherical roller bearings
Needle roller bearings
Cylindrical roller bearings
Tapered roller bearings

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

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Machine Design
Plastic flow in ductile materials

Has no effect on it
Increases the seriousness of static loading stress concentration
Depends on other considerations
Lessens the seriousness of static loading stress concentration

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Machine Design
A bolt of M 24 × 2 means that

The nominal diameter of bolt is 24 mm and pitch is 2 mm
The effective diameter of bolt is 24 mm and there are 2 threads per cm
Cross-sectional area of the threads is 24 mm²
The pitch of the thread is 24 mm and depth is 2 mm

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