Machine Design
If P1 and P2 are the tight and slack side tensions in the belt, then the initial tension Pi (according to Barth) will be equal to (Where, Pc is centrifugal tension)

⅟₂× (P1 + P2)
[(√P1 + √P2)/2]²
P1 + P2
[⅟₂ × (P1 + P2)] + Pc

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Machine Design
Set screws are

Used to prevent relative motion between parts
Similar to small size tap bolts except that a greater variety of shapes of heads are available
Slotted for a screw driver and generally used with a nut
Similar to stud

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

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Machine Design
In hydrodynamic bearings

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

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