Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

None of these
Axially upwards
Axially upwards or downwards
Axially downwards

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Machine Design
Which is correct statement? Stress concentration in cyclic loading is

Seriousness would depend on other factors
Very serious in brittle materials and less serious in ductile materials
Equally serious in both types of materials
Very serious in ductile materials and less serious in brittle materials

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