Machine Design
Which of the following bearing is preferred for oscillating conditions?

Angular contact single row ball bearing
Double row roller bearing
Taper roller bearing
Needle roller bearing

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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

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

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