Machine Design
In static loading, stress concentration is more serious in

Ductile materials
Brittle as well as ductile materials
Brittle materials
Elastic materials

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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
Is maximum at zero speed and decreases monotonically with increase in speed
Remains constant at all speeds
Is minimum at zero speed and increases monotonically with increase in speed

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Machine Design
When the shaft rotates in anticlockwise direction at high speed in a bearing, it will

Have contact at the bottom most of the bearing
Move towards right of the bearing making metal to metal contact
Move towards right of the bearing making no metal to metal contact
Move towards left of the bearing making metal to metal contact

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