Machine Design
Which of the following statement is wrong for a connecting rod?

The most suitable section for the connecting rod is T-section
The connecting rod will be equally strong in buckling about X-axis and Y-axis, if Ixx = 4 Iyy
If Ixx < 4 Iyy, the buckling will occur about X-axis
If Ixx > 4 Iyy, the buckling will occur about Y-axis

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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 is subjected to a higher stress than the outer side
It has a lower curvature 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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