Machine Design
In a turnbuckle, if one of the rods has left hand threads, then the other rod will have

Pointed threads
Multiple threads
Right hand threads
Left hand threads

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Machine Design
Pitch point of a cam is

A point on the pitch curve having minimum pressure angle
A point on the pitch curve having maximum pressure angle
Any point on the pitch circle
Any point on the pitch curve

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Machine Design
Tapered roller bearings can take

Axial load only
Radial load only
Both radial and axial loads and the ratio of these being greater than unity
Both radial and axial loads and the ratio of these being less than unity

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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 the bottom of the key is shaped to fit the curved surface of 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 is flat on the shaft

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