Theory of Machine
The advantage of the piston valve over the slide valve is that in the former case

Power absorbed is less
Both wear and power absorbed are low
Wear is less
The pressure developed being high provides tight sealing

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Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Both open belt drive and crossed belt drive is recommended
The drive is recommended depending upon the torque transmitted
Open belt drive is recommended
Crossed belt drive is recommended

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Theory of Machine
The inversion of a mechanism is

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

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