Machine Design
While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as

Both the ends fixed
One end fixed and the other end hinged
Both the ends hinged
One end fixed and the other end free

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Machine Design
Cold working

Alone has no influence on fatigue strength
Has no influence on fatigue strength
Increases the fatigue strength
Decreases the fatigue strength

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Machine Design
A hollow saddle key is

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

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