Machine Design
The ball bearings are provided with a cage

To reduce friction
To prevent the lubricant from flowing out
To facilitate slipping of balls
To maintain the balls at a fixed distance apart

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Machine Design
Stress concentration is caused due to

Variation in properties of material from point to point in a member
All of these
Abrupt change of section
Pitting at points or areas at which loads on a member are applied

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Seriousness would depend on other factors
Equally serious in both types of materials
Very serious in brittle materials and less serious in ductile materials
Very serious in ductile materials and less serious in brittle materials

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Machine Design
Plastic flow in ductile materials

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

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