Machine Design
A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

Sawn nut
Castle nut
Ring nut
Jam nut

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Machine Design
When a belt drive is transmitting maximum power,

Driving tension on tight side is twice the centrifugal tension
Driving tension on slack side is equal to centrifugal tension
Effective tension is half of centrifugal tension
Effective tension is equal to centrifugal tension

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Machine Design
The contact ratio is the ratio of

Length of path of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of arc of approach to the circular pitch
Length of arc of contact to the circular pitch

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