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Masks, which are used to confine the jet stream location on work piece are made of, which type of materials?

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Masks, which are used to confine the jet stream location on work piece are made of, which type of materials?

(a) Copper

(b) Glass

(c) Rubber

(d) All of the mentioned

I have been asked this question in final exam.

This interesting question is from Abrasive Jet Machining in chapter Mechanical Processes of Advanced Machining

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Correct answer is (d) All of the mentioned

Easy explanation: Masks can be made of any of the above-mentioned materials.

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