Machine Design
The ball bearings are provided with a cage

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

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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
In order to determine the stresses in a thin cylinder due to an internal pressure, it is assumed that

The effect of curvature of the cylinder wall is neglected
The tensile stresses are uniformly distributed over the section of the walls
All of these
The effect of the restraining action of the heads at the end of the pressure vessel is neglected

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