Machine Design
A sliding bearing which operates without any lubricant present, is called

Zero film bearing
Boundary lubricated bearing
Hydrostatic lubricated bearing
Hydrodynamic lubricated bearing

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Machine Design
A triple riveted butt joint with double straps of unequal width is to be designed for a boiler shell. The pitch of the rivets in the outer row is double the pitch in the inner row and zigzag riveting is proposed. Which of the following statement is correct?

There are five rivets per pitch length, out of which four are in double shear and one is in single shear
There are five rivets per pitch length, all in double shear
There are four rivets per pitch length, all in double shear
There are four rivets per pitch length, out of which two are in single shear and two are in double shear

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