Machine Design
Machine screws are

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

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Machine Design
When the belt is transmitting maximum power,

The tension in slack side is equal to the centrifugal tension
The tension in tight side is twice the centrifugal tension
The tension in tight side is thrice the centrifugal tension
None of these

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