Question

Which of the following equipment is used for determining the concentration of dust accurately?

(a) Screener

(b) Air Dryer

(c) Jas Filter

(d) Gravimetric sampler

I got this question during an online interview.

Asked question is from Dust Measurement and Sampling topic in section Foundry Environment Health & Dust Problem in Foundries of Casting-Forming-Welding I

Answer 1

Correct answer is (d) Gravimetric sampler

Explanation: Gravimetric sampler is used for determining the concentration of dust, which provides a time weighted mean dust concentration. A special filter is used in this sampler which uses the analytical technique to determine silica content and also estimates an average dust concentration over the sampling stage.