Machine Design
If the centre distance of the mating gears having involute teeth is increased, then the pressure angle

Remains unchanged
None of these
Decreases
Increases

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Machine Design
The fatigue stress concentration factor is defined as

The product of the endurance limits with and without stress concentration
The ratio of endurance limit with stress concentration to the endurance limit without stress concentration
All of these
The ratio of endurance limit without stress concentration to the endurance limit with stress concentration

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