Machine Design
The cracks in helical springs used in railway carriages usually start on the inner side of the coil because of the fact that

It has a lower curvature than the outer side
It is subjected to a higher stress than the outer side
It is subjected to a higher cyclic loading than the outer side
It is more stretched than the outer side during the manufacturing process

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Machine Design
Turn buckle has

No threads
Right hand threads on bout ends
Left hand threads on both ends
Left hand threads on one end and right hand threads on other end

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Machine Design
When the belt is transmitting maximum power,

The tension in slack side is equal to the centrifugal tension
The tension in tight side is twice the centrifugal tension
None of these
The tension in tight side is thrice the centrifugal tension

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

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
Becomes minimum at an optimum speed and then increases with further increase in speed

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