Question

What is the average velocity at the slit in Owan’s Jet counter apparatus?

(a) 100 m/s

(b) 150 m/s

(c) 250 m/s

(d) 360 m/s

I got this question in an interview for internship.

Asked question is from Dust Control and Dust Extraction in Foundry topic in portion Foundry Environment Health & Dust Problem in Foundries of Casting-Forming-Welding I

Answer 1

Correct option is (c) 250 m/s

The best explanation: The Owan’s Jet Counter works on very high velocity using a hand pump. The velocity of operation, of this apparatus is between 200 m/s to 300 m/s, which makes the average velocity of operation to be 250m/s.