Machine Design
When the material of key and shaft is same, and the width of key is one-fourth of the diameter of shaft (d), then length of key will be

0.8 d
1.8 d
1.2 d
1.57 d

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Machine Design
Tapered roller bearings can take

Both radial and axial loads and the ratio of these being less than unity
Radial load only
Both radial and axial loads and the ratio of these being greater than unity
Axial load only

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