Machine Design
A tapered key which fits in a key way in the hub and is flat on the shaft, is known as

Gib-head key
Feather key
Wood ruff key
Flat saddle key

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Machine Design
When a belt drive is transmitting maximum power,

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

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