Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Smaller than
None of these
Larger than
Equal to

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Machine Design
Stress concentration is caused due to

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

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