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

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

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Theory of Machine
Which of the following statements regarding laws governing the friction between dry surfaces are correct?

All of these
The friction force is dependent on the materials of the contact surfaces.
The friction force is directly proportional to the normal force.
The friction force is independent of me area of contact.

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