Machine Design
A taper key which fits half in the key way of the hub and half in the key way of shaft, is known as

Angular bevel gears
Internal bevel gears
Crown Bevel gears
Mitre gears

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Machine Design
When a belt drive is transmitting maximum power,

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

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