Machine Design
The power transmitted by the belt drive can be increased by

Increasing the initial tension in the belt
Dressing the belt to increase the coefficient of friction
All of these
Increasing wrap angle by using idler pulley

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Machine Design
A hollow saddle key is

A taper key which fits half in the key way of hub and half in the key way of shaft
A taper key which fits in a key way of the hub and is flat on the shaft
A taper key which fits in a key way of the hub and the bottom of the key is shaped to fit the curved surface of the shaft
Provided in pairs at right angles and each key is to withstand torsion in one direction only

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