Machine Design
When a circular beam of diameter d is subjected to a shear force F, the maximum shear stress induced will be

4F/ πd²
6F/ πd²
8F/ πd²
16F/ 3πd²

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Machine Design
In hydrodynamic bearings

The oil film is maintained by supplying oil under pressure
The oil film pressure is generated only by the rotation of the journal
Do not require external supply of lubricant
Grease is used for lubrication

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Machine Design
When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Maximum at the centroidal axis and zero at the outer surface of the member
Zero at the centroidal axis and maximum at the outer surface of the member
Zero at both the centroidal axis and outer surface of the member
Maximum at both the centroidal axis and outer surface of the member

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

If Ixx > 4 Iyy, the buckling will occur about Y-axis
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
The most suitable section for the connecting rod is T-section

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