Theory of Machine
In a steam engine, the distance by which the outer edge of the D-slide valve overlaps the steam port is called

Exhaust lap
None of these
Steam lap
Lead

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Theory of Machine
The inversion of a mechanism is

Turning its upside down
Obtained by fixing different links in a kinematic chain
Changing of a higher pair to a lower pair
Obtained by reversing the input and output motion

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