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In pneumatic chisel, what is the dust velocity normally?

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in Casting-Forming-Welding I by (687k points)
In pneumatic chisel, what is the dust velocity normally?

(a) 270 meters/min

(b) 330 meters/min

(c) 370 meters/min

(d) 430 meters/min

The question was posed to me in final exam.

The above asked question is from Dust Control and Dust Extraction in Foundry topic in division Foundry Environment Health & Dust Problem in Foundries of Casting-Forming-Welding I

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Right choice is (c) 370 meters/min

The best I can explain: In pneumatic chisel, there is a vacuum created of up to 250 to 375 Hg. This enables the dust velocity to be around 370 meters/minute.

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