An ideal sand for filters should be (A) Free from dirt and other impurities (B) Uniform in nature and size (C) Hard and resistant (D) All the above

An ideal sand for filters should be
(A) Free from dirt and other impurities
(B) Uniform in nature and size
(C) Hard and resistant
(D) All the above
by

1 Answer

Answer :

(D) All the above
by

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Rapid gravity filters (A) Were developed by G.W. Fuller (B) Make use of coarser sand with effective size as 0.5 mm (C) Yield as high as 30 times the yield of slow sand filters (D) All the above

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In rapid sand filters the ratio of length and diameter of the lateral, should not be greater than (A) 10 (B) 15 (C) 20 (D) 25

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In slow sand filters, the turbidity of raw water can be removed only up to (A) 60 mg/litre (B) 75 mg/litre (C) 100 gm/litre (D) 150 mg/litre

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