Machine Design
The contact ratio is the ratio of

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

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Machine Design
Stress concentration is caused due to

Abrupt change of section
All of these
Variation in properties of material from point to point in a member
Pitting at points or areas at which loads on a member are applied

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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
Used to prevent relative motion between two parts
Slotted for a screw driver and generally used with a nut
Similar to stud

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