The maximum permitted loss of head in a rapid sand filter, is (A) 1 m (B) 2 m (C) 3 m (D) 4 m

The maximum permitted loss of head in a rapid sand filter, is
(A) 1 m
(B) 2 m
(C) 3 m
(D) 4 m
by

1 Answer

Answer :

(C) 3 m
by

Related questions

A high velocity of wash water is required for (A) Rapid gravity filter with strainers (B) Rapid gravity filter without strainers (C) Slow sand filter with strainers (D) Slow sand filter without strainers

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Last Answer : (B) Rapid gravity filter without strainers

Rapid sand filter (A) Should be preceded by coagulation and sedimentation (B) Uses rapid sand as filter media(C) Is used after slow sand filtering has been done (D) Can combine disinfection also

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Last Answer : (A) Should be preceded by coagulation and sedimentation

The yield of a rapid gravity filter as compared to that of slow sand filter, is (A) 10 times (B) 15 times (C) 20 times (D) 30 times

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Last Answer : (D) 30 times

Distribution of wash water is provided in (A) Sedimentation tank (B) Slow sand filter (C) Rapid gravity filter (D) All the above

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Last Answer : (C) Rapid gravity filter

In a rapid sand filter, air binding is caused due to excessive (A) Negative pressure (B) Pressure (C) Turbidity (D) Water pressure

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Consider the following statements. The role of the gravel bed in a rapid sand filter is : 1. To filter out large suspended matter 2. To support the sand bed above it 3. To prevent the escape of sand particles 4. To uniformly distribute the backwash water 5. To prevent algae growth Which of the following statements are correct ? a) 1, 2, 3, 4 and 5 b) 2, 3 and 4 only c) 3, 4 and 5 only d) 1, 2 and 3 only

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Last Answer : b) 2, 3 and 4 only

Which of the following operational problems relate to the functioning of rapid gravity filter ? 1. Inadequate media comprising filter bed 2. Sludge bulking 3. Mud balls 4. Negative head 5. Incrustation of media (a) 1, 3, 4 and 5 only (b) 1, 2, 3 and 4 only (c) 2, 3, 4 and 5 only (d) 1, 2, 3, 4 and 5

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Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m2 /hr. (A) 0.1 to 1 (B) 3 to 6 (C) 10 to 15 (D) 15 to 20

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Insufficient washing of sand grains in a rapid sand filter causes (A) Air binding (B) Shrinkage of filtering media (C) Mud balls (D) Expansion of filtering media

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Deviation of the alignment of a trace cut may be permitted in areas involving (A) Land slides (B) Sand dunes (C) Dens (D) None of these

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A slow sand filter is cleaned if its filter head is higher than (A) 10 cm to 20 cm (B) 20 cm to 40 cm (C) 40 cm to 70 cm (D) 70 cm to 120 cm

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Pick up the incorrect statement from the following: (A) The water entering the slow sand filters should be treated by 9.386 coagulants (B) The depth of water on the filter should be twice the depth of the filter sand (C) When the filter head is 0.75 times the depth of filter sand, the water obtained is purest (D) All the above

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A slow sand filter is cleaned if its filter head is higher than (A) 10 cm to 20 cm (B) 20 cm to 40 cm (C) 40 cm to 70 cm (D) 70 cm to 120 cm

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The maximum non-verticality of the bore of a well 200 m deep, may be permitted up to (A) 25 cm (B) 50 cm (C) 75 cm (D) 100 cm

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If the effective plan area of a warehouse is 54 sq. m, and maximum height of piles permitted is 270 cm, the number of cement bags to be stored, is (A) 2000 bags (B) 2200 bags (C) 2400 bags (D) 2700 bags

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Slow sand filter is used if maximum turbidity of raw water is less than (A) 10 gm/litre (B) 20 gm/litre (C) 30 gm/litre (D) 50 gm/litre

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Last Answer : (D) 50 gm/litre

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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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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Rapid gravity filter can only remove turbidity of water upto (A) 15 to 25 gm/litre (B) 25 to 30 gm/litre (C) 30 to 35 cm/litre (D) 35 to 40 gm/litre

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a rapid gravity filter (A) Raw water from the source is supplied (B) Disinfected raw water is supplied (C) Raw water passed through coagulation tank is supplied (D) None of these

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If the rate of change of grade permitted along a vertical curve is r and total change of grade is g%, the length L of the curve to be provided, is (A) L = (r × 100/g) m (B) L = (g × 100/r) m (C) L = (r + g) × 100m (D) L = [100/(r + g)] m

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Maximum threshold number permitted for indicating the odour of public water supplies, is (A) 1 (B) 2 (C) 3 (D) 4

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The steepest gradient permitted on roads which, in ordinary conditions, does not exceed, is known (A) Ruling gradient (B) Maximum gradient (C) Exceptional gradient (D) Floating gradient

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The maximum amount of dust which may be permitted in aggregates is (A) 5% of the total aggregates for low workability with a coarse grading (B) 10% of the total aggregates for low workability with a fine grading (C) 20% of the total aggregates for a mix having high workability with fine grading (D) All the above

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The hydraulic head that would produce a quick condition in a sand stratum of thickness 1.5 m, specific gravity 2.67 and voids ratio 0.67 is equal to(A) 1.0 m (B) 1.5 m (C) 2.0 m (D) 3 m

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Mud balls may be removed by (A) Breaking and washing (B) Washing the filter with a solution of caustic soda (C) Removing, cleaning and replacing the damaged sand (D) All the above

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Efficiency of removing bacterias from raw water by a slow sand filter, is (A) 80% to 81% (B) 85% to 86% (C) 90% to 97% (D) 98% to 99%

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The period of cleaning of a slow sand filter, is usually (A) 5 to 10 days (B) Two weeks to three weeks (C) One month to three months (D) Three months to six months

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After cleaning a slow sand filter, the filtered water is not used for (A) 6 hours to 12 hours (B) 12 hours to 18 hours (C) 18 hours to 24 hours (D) 24 hours to 36 hours

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