Machine Design
The maximum stress due to stress concentration in a bar having circular transverse hole, as compared to its static stress without hole will be

3 times more
Same in both cases
4 times more
2 times more

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Machine Design
A bolt of uniform strength can be developed by

None of these
Keeping the core diameter smaller than the diameter of the unthreaded portion
Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt
Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

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Machine Design
Machine screws are

Similar to small size tap bolts except that a greater variety of shapes of heads are available
Similar to stud
Used to prevent relative motion between two parts
Slotted for a screw driver and generally used with a nut

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Machine Design
Turn buckle has

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

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