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

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

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Theory of Machine
A thin circular disc is rolling with a uniform linear speed, along a straight path on a plane surface. Which of the following statement is correct in this regard?

All points of the disc have the same velocity
The point on the disc making contact with the plane surface has zero acceleration
The centre of the disc has centrifugal acceleration
The centre of the disc has zero acceleration

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