Machine Design
A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where σ = Stress for a plate with no hole i.e. nominal stress)

σ [1 + (b/3a)]
σ [1 + (b/2a)]
σ [1 + (2a/b)]
σ [1 + (3a/b)]

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Machine Design
Turn buckle has

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

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Machine Design
In case of V belt drive

The belt should not touch the bottom of groove in the pulley
None of these
The belt should not touch the sides of groove in the pulley
The belt should touch the bottom of groove in the pulley

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