Machine Design
The ball bearings are provided with a cage

To facilitate slipping of balls
To prevent the lubricant from flowing out
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 static loading is

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

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Machine Design
In cross or regular lay ropes

Direction of twist of wires and strands are same
Direction of twist of wires in strands is opposite to the direction of twist of strands
Wires are not twisted
Wires in two adjacent strands are twisted in opposite direction

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