Machine Design
Stress concentration is caused due to

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

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Machine Design
In an oil lubricated journal bearing, the coefficient of friction between the journal and the bearing

Becomes minimum at an optimum speed and then increases with further increase in speed
Remains constant at all speeds
Is maximum at zero speed and decreases monotonically with increase in speed
Is minimum at zero speed and increases monotonically with increase in speed

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