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__________________ are used to collect the valuable chemical or mineral dusts.(a) Dry filters(b) Viscous filters(c) Water filters(d) Electric precipitatorThis question was addressed to me in an internship interview.My query is from Variations in Ventilation System with Climate in portion Acoustics and Ventilation of Construction & Building Materials

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Correct ANSWER is (d) ELECTRIC precipitator

To explain: The initial cost of electric precipitators is high, but the operation cost is low. A strong electric field is developed and DUST particles are subjected to this electric field are ATTRACTED TOWARDS negative electrode. The sufficient quantity of dust particles deposited on the negative electrode is removed at intervals.



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