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On which property of water, will the accumulator in Water jet machining rely on?

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in Advanced Machining by (962k points)
On which property of water, will the accumulator in Water jet machining rely on?

(a) Density

(b) Compressibility

(c) Viscosity

(d) Velocity

This question was addressed to me during an interview.

The above asked question is from Water Jet Machining topic in portion Mechanical Processes of Advanced Machining

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Right answer is (b) Compressibility

To explain I would say: Accumulator relies on compressibility of water (12% at 3800bar), in order to maintain a uniform discharge pressure in WJM.

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