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)

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

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Machine Design
Set screws are

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

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Machine Design
In worm, gears, pitch lead angle is

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

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Machine Design
When the belt speed increases

Power transmitted decreases
Power transmitted remains the same
Power transmitted increases to a maximum value and then decreases
Power transmitted increases

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