Machine Design
The bending stress in a curved beam is

Maximum at the neutral axis
Zero at the point other than centroidal axis
None of these
Zero at the centroidal axis

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Machine Design
Spring stiffness is

Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Its capability of storing energy
Its ability to absorb shocks

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

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

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