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

None of these
Axially downwards
Axially upwards or downwards
Axially upwards

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Machine Design
A bolt of uniform strength can be developed by

Keeping the core diameter smaller than the diameter of the unthreaded portion
None of these
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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