Machine Design
In hydrodynamic bearings

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

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and an element of the cylinder
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and the plane of rotation
None of these

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

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