Discussion
In abrasive jet machining, as the distance between the nozzle tip and the work surface increases, the material removal rate
Answer: D
The material removal rate increases, becomes stable and then decreases as the stand-off distance grows.
Very close to the work, the jet has not yet reached full speed over its cross section and the abrasive that bounces back off the surface interferes with the incoming stream, so removal is low. As the nozzle moves back, the jet develops fully and the removal rate rises to a broad maximum over a range of stand-off distances. Further back still, the jet diverges and the particles lose velocity to air drag, so they strike a larger area with less energy and the removal rate falls.
A steady rise or a steady fall each describe only one side of this peaked curve, and 'decreases, becomes stable and then increases' is the curve turned upside down.
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