Machine Design
Turn buckle has

No threads
Left hand threads on one end and right hand threads on other end
Right hand threads on bout ends
Left hand threads on both ends

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and an element of the cylinder
None of these
The angle between the tangent to the pitch helix and the plane of rotation
Half the angle between two inclined faces in axial plane

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Machine Design
Which is correct statement? Stress concentration in static loading is

Equally serious in both types of materials
Very serious in brittle materials and less serious in ductile materials
Very serious in ductile materials and less serious in brittle materials
Seriousness would depend on other factors

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