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

Right hand threads
Multiple threads
Left hand threads
Pointed threads

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Machine Design
When the speed of belt increases,

The coefficient of friction between the belt and pulley increases
The coefficient of friction between the belt and pulley decreases
The power transmitted will increase
The power transmitted will decrease

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Machine Design
The contact ratio is the ratio of

Length of arc of contact to the circular pitch
Length of arc of recess to the circular pitch
Length of path of contact to the circular pitch
Length of arc of approach to the circular pitch

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